Ethan Siegel
@startswithabang.bsky.social
Cosmologist, science communicator, author, speaker, and longtime writer of Starts With A Bang.
Not the next Carl Sagan; the first Ethan Siegel.
Not the next Carl Sagan; the first Ethan Siegel.
Very different from Streets of Philadelphia, but worth a listen as a 2026-appropriate protest/revolution song.
cc: @spacewhalerider.com
cc: @spacewhalerider.com
I wrote this song on Saturday, recorded it yesterday and released it to you today in response to the state terror being visited on the city of Minneapolis. It’s dedicated to the people of Minneapolis, our innocent immigrant neighbors and in memory of Alex Pretti and Renee Good.
Stay free
Stay free
Bruce Springsteen - Streets Of Minneapolis (Official Audio)
YouTube video by Bruce Springsteen
youtu.be
January 28, 2026 at 5:59 PM
Very different from Streets of Philadelphia, but worth a listen as a 2026-appropriate protest/revolution song.
cc: @spacewhalerider.com
cc: @spacewhalerider.com
JWST finds nine category-defying objects. Have astronomers found their “platypus?”
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
JWST finds nine category-defying objects. Have astronomers found their "platypus?"
Just like animals, galaxies often have bizarre, unusual, or even unique properties. But finding many, all at once, really does raise alarms.
bigthink.com
January 28, 2026 at 4:16 PM
JWST finds nine category-defying objects. Have astronomers found their “platypus?”
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
The platypus, in the animal kingdom, has a collection of features that have never been seen together in any other specimen.
Here's astronomy's version.
bigthink.com/starts-with-...
#space #astro #platypus
When you are over your word count, my rule is don't worry about "how many words am I over by" but rather the percentage.
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
the lion doesn't concern himself with the reality of being grotesquely over wordcount
January 27, 2026 at 5:31 PM
When you are over your word count, my rule is don't worry about "how many words am I over by" but rather the percentage.
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Over by 300 words on a 600 word piece? That's bad!
Over by 300 words on a 3000 word piece? That's nothing!
If your first submitted draft is over by 20% or less, you're on track!
Yes, one image from space can change humanity’s perspective
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Yes, one image from space can change humanity's perspective
Our view of the world, the Universe, and ourselves can change with just one glimpse of what's out there. It's happened many times before.
bigthink.com
January 27, 2026 at 4:53 PM
Yes, one image from space can change humanity’s perspective
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
Although we might not think about it often, simply looking at a single image from space can shift the perspective of even the most hard-hearted of humans.
Which one speaks to you the most?
bigthink.com/starts-with-...
#space #astro
In this non-satirical opinion piece by one of the UK's most prominent transphobes, a bigoted monster paints tolerance and acceptance as "illiberal values."
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
In @nytopinion.nytimes.com
Younger generations “have fallen out of love with Harry Potter because they have fallen out of love with the worldview the series represents,” writes Louise Perry. “Which is to say that young people have fallen out of love with liberalism.”
Younger generations “have fallen out of love with Harry Potter because they have fallen out of love with the worldview the series represents,” writes Louise Perry. “Which is to say that young people have fallen out of love with liberalism.”
Opinion | Why Gen Z Doesn’t Love ‘Harry Potter’
The wizarding worldview is naïve.
nyti.ms
January 27, 2026 at 12:05 AM
In this non-satirical opinion piece by one of the UK's most prominent transphobes, a bigoted monster paints tolerance and acceptance as "illiberal values."
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
Too bad the @nytimes.com won't reprint Voltaire's 1763 "treatise on tolerance" and let its readers learn something beside hatred for once.
When someone from Minnesota (or Portland, Los Angeles, Chicago, etc.) refers to protestors as "insurgents" or of the movement as an "insurgency," let the alarm bells ring in your head.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
January 26, 2026 at 9:55 PM
When someone from Minnesota (or Portland, Los Angeles, Chicago, etc.) refers to protestors as "insurgents" or of the movement as an "insurgency," let the alarm bells ring in your head.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
You can only have an insurgency against an occupying military force.
They tell on themselves every time.
What the Universe looks like: from nearby to far away
From our own Solar System to the most distant galaxy and beyond, we've caught glimpses of the Universe on every scale.
Here's what it all looks like.
bigthink.com/starts-with-...
#space #astro #galaxies #stars #planets
From our own Solar System to the most distant galaxy and beyond, we've caught glimpses of the Universe on every scale.
Here's what it all looks like.
bigthink.com/starts-with-...
#space #astro #galaxies #stars #planets
What the Universe looks like: from nearby to far away
Outer space begins just over 100 kilometers up, but what we can see extends for billions of light-years. Here's what all of it looks like.
bigthink.com
January 26, 2026 at 4:58 PM
Where are all the blueshifted galaxies?
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
Ask Ethan: Where are all the blueshifted galaxies?
Even in an expanding Universe, we expect both redshifted and blueshifted galaxies. But nearly every one we see is redshifted. Here's why.
bigthink.com
January 23, 2026 at 5:42 PM
Where are all the blueshifted galaxies?
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
#AskEthan
The Universe is expanding, sure.
Nearby, many galaxies are blueshifted, far away, few are, and beyond a certain distances, none are.
What does this imply, and how do we know?
bigthink.com/starts-with-...
#space #astrophysics #astro #expanding
This is what we call murder.
Unnecessary, preventable murder, particularly of innocent children and babies.
You can save people by giving them these vaccines, or you can kill many of them by not giving them these vaccines.
MAHA's goal is to "measure" the murder of children and babies.
Unnecessary, preventable murder, particularly of innocent children and babies.
You can save people by giving them these vaccines, or you can kill many of them by not giving them these vaccines.
MAHA's goal is to "measure" the murder of children and babies.
RFK Jr. appointee Kirk Milhoan has just clearly stated, out loud, that he wants to experiment on the people of the United States by seeing what happens as vaccination coverage plummets and infectious diseases spread.
January 22, 2026 at 8:42 PM
This is what we call murder.
Unnecessary, preventable murder, particularly of innocent children and babies.
You can save people by giving them these vaccines, or you can kill many of them by not giving them these vaccines.
MAHA's goal is to "measure" the murder of children and babies.
Unnecessary, preventable murder, particularly of innocent children and babies.
You can save people by giving them these vaccines, or you can kill many of them by not giving them these vaccines.
MAHA's goal is to "measure" the murder of children and babies.
Remembering Gladys West: who used Einstein to create GPS
RIP to Gladys West: the "hidden figure" most people have never heard of, but whose work is second only to Einstein's in enabling and developing our modern GPS.
#BlackInAstro
bigthink.com/starts-with-...
#space #GPS #astro #physics #einstein
RIP to Gladys West: the "hidden figure" most people have never heard of, but whose work is second only to Einstein's in enabling and developing our modern GPS.
#BlackInAstro
bigthink.com/starts-with-...
#space #GPS #astro #physics #einstein
Remembering Gladys West: who used Einstein to create GPS
Two main contributors enabled our modern global positioning system (GPS): Albert Einstein and Gladys West. Here's how she made it happen.
bigthink.com
January 22, 2026 at 4:55 PM
Remembering Gladys West: who used Einstein to create GPS
RIP to Gladys West: the "hidden figure" most people have never heard of, but whose work is second only to Einstein's in enabling and developing our modern GPS.
#BlackInAstro
bigthink.com/starts-with-...
#space #GPS #astro #physics #einstein
RIP to Gladys West: the "hidden figure" most people have never heard of, but whose work is second only to Einstein's in enabling and developing our modern GPS.
#BlackInAstro
bigthink.com/starts-with-...
#space #GPS #astro #physics #einstein
Journalists at Nature asked the question, "how much science, and how many scientists, have been lost from the US's greatest national institutions."
We've lost about a quarter of much of our greatest assets in 2025.
The scientific exodus and brain drain intensifies. Our greatness is leaving.
We've lost about a quarter of much of our greatest assets in 2025.
The scientific exodus and brain drain intensifies. Our greatness is leaving.
January 22, 2026 at 7:09 AM
Journalists at Nature asked the question, "how much science, and how many scientists, have been lost from the US's greatest national institutions."
We've lost about a quarter of much of our greatest assets in 2025.
The scientific exodus and brain drain intensifies. Our greatness is leaving.
We've lost about a quarter of much of our greatest assets in 2025.
The scientific exodus and brain drain intensifies. Our greatness is leaving.
Yes and yes!
If it were earlier in my career, this job might've been the right opportunity for me.
I'm too happy doing my own thing, but it might be right for you!
If it were earlier in my career, this job might've been the right opportunity for me.
I'm too happy doing my own thing, but it might be right for you!
Do you like seeing the amazing science from JWST and Hubble 🔭? Are you a seasoned leader of Science Communication who wants to see more of this? Space Telescope Science Institute's Office of Public Outreach is seeking a Division Head! Apply here: www.linkedin.com/jobs/view/43...
January 21, 2026 at 6:30 PM
Yes and yes!
If it were earlier in my career, this job might've been the right opportunity for me.
I'm too happy doing my own thing, but it might be right for you!
If it were earlier in my career, this job might've been the right opportunity for me.
I'm too happy doing my own thing, but it might be right for you!
How a solar radiation storm created January 2026’s aurora
The first good auroral show of 2026 began not with a solar flare nor a coronal mass ejection, but a solar radiation (particle) storm.
It's the first big one since 2003!
bigthink.com/starts-with-...
#space #particle #sun #astro #heliophysics
The first good auroral show of 2026 began not with a solar flare nor a coronal mass ejection, but a solar radiation (particle) storm.
It's the first big one since 2003!
bigthink.com/starts-with-...
#space #particle #sun #astro #heliophysics
How a solar radiation storm created January 2026's aurora
The Sun often produces solar flares and coronal mass ejections, but a rare solar radiation storm made the 2026's first great auroral show.
bigthink.com
January 21, 2026 at 4:34 PM
How a solar radiation storm created January 2026’s aurora
The first good auroral show of 2026 began not with a solar flare nor a coronal mass ejection, but a solar radiation (particle) storm.
It's the first big one since 2003!
bigthink.com/starts-with-...
#space #particle #sun #astro #heliophysics
The first good auroral show of 2026 began not with a solar flare nor a coronal mass ejection, but a solar radiation (particle) storm.
It's the first big one since 2003!
bigthink.com/starts-with-...
#space #particle #sun #astro #heliophysics
The most underappreciated achievement in theoretical physics
Extracting testable predictions from a theory, and then actually testing them, is a tremendous achievement.
Whether your idea is confirmed or invalidated isn't the point.
The knowledge is.
bigthink.com/starts-with-...
#physics #space
Extracting testable predictions from a theory, and then actually testing them, is a tremendous achievement.
Whether your idea is confirmed or invalidated isn't the point.
The knowledge is.
bigthink.com/starts-with-...
#physics #space
The most underappreciated achievement in theoretical physics
Many view the development of fringe, alternative theories as a useless waste of time. But when they can be tested, it shows what reality is.
bigthink.com
January 20, 2026 at 4:28 PM
The most underappreciated achievement in theoretical physics
Extracting testable predictions from a theory, and then actually testing them, is a tremendous achievement.
Whether your idea is confirmed or invalidated isn't the point.
The knowledge is.
bigthink.com/starts-with-...
#physics #space
Extracting testable predictions from a theory, and then actually testing them, is a tremendous achievement.
Whether your idea is confirmed or invalidated isn't the point.
The knowledge is.
bigthink.com/starts-with-...
#physics #space
Reposted by Ethan Siegel
One year into Trump's second presidency, how are science and medical research faring? Our @nature.com team breaks it down for you. (1/n)
From @virginiagewin.bsky.social, learn about
Layoffs ✅
Funding cuts ✅
Attacks on science ✅
www.nature.com/articles/d41...
🧪
From @virginiagewin.bsky.social, learn about
Layoffs ✅
Funding cuts ✅
Attacks on science ✅
www.nature.com/articles/d41...
🧪
‘Shattered’: US scientists speak out about how Trump policies disrupted their careers
Researchers lay bare the human toll of lay-offs, funding cuts and attacks on science one year after the president’s return to the White House.
www.nature.com
January 20, 2026 at 3:41 PM
One year into Trump's second presidency, how are science and medical research faring? Our @nature.com team breaks it down for you. (1/n)
From @virginiagewin.bsky.social, learn about
Layoffs ✅
Funding cuts ✅
Attacks on science ✅
www.nature.com/articles/d41...
🧪
From @virginiagewin.bsky.social, learn about
Layoffs ✅
Funding cuts ✅
Attacks on science ✅
www.nature.com/articles/d41...
🧪
10 JWST images that reveal the Universe as never before
Month after month and year after year, JWST just keeps delivering.
If you saw its early images but missed the best of 2025, these 10 unique views will catch you right up.
bigthink.com/starts-with-...
#space #astro #jwst
Month after month and year after year, JWST just keeps delivering.
If you saw its early images but missed the best of 2025, these 10 unique views will catch you right up.
bigthink.com/starts-with-...
#space #astro #jwst
10 JWST images that reveal the Universe as never before
With unprecedented resolution, wavelength sensitivity, and light-gathering power, JWST reveals our cosmos like no other observatory ever.
bigthink.com
January 19, 2026 at 4:41 PM
10 JWST images that reveal the Universe as never before
Month after month and year after year, JWST just keeps delivering.
If you saw its early images but missed the best of 2025, these 10 unique views will catch you right up.
bigthink.com/starts-with-...
#space #astro #jwst
Month after month and year after year, JWST just keeps delivering.
If you saw its early images but missed the best of 2025, these 10 unique views will catch you right up.
bigthink.com/starts-with-...
#space #astro #jwst
Why do gravitational lenses make crosses, not rings?
#AskEthan
When an observer, foreground mass, and a background light source all align, you get a gravitational lens.
You might expect Einstein rings, but more often you get crosses.
Here's why.
bigthink.com/starts-with-...
#space #astro
#AskEthan
When an observer, foreground mass, and a background light source all align, you get a gravitational lens.
You might expect Einstein rings, but more often you get crosses.
Here's why.
bigthink.com/starts-with-...
#space #astro
Ask Ethan: Why do gravitational lenses make crosses, not rings?
Gravitational lenses arise when foreground masses and background light sources properly align. Einstein rings are rare, but crosses abound.
bigthink.com
January 16, 2026 at 6:38 PM
Why do gravitational lenses make crosses, not rings?
#AskEthan
When an observer, foreground mass, and a background light source all align, you get a gravitational lens.
You might expect Einstein rings, but more often you get crosses.
Here's why.
bigthink.com/starts-with-...
#space #astro
#AskEthan
When an observer, foreground mass, and a background light source all align, you get a gravitational lens.
You might expect Einstein rings, but more often you get crosses.
Here's why.
bigthink.com/starts-with-...
#space #astro
We. Do. Not. Vote. On. Rights.
That's what makes them rights.
The issue is about trans rights, and the rights of all people.
As soon as you allow people to vote on them, or to allow public opinion to determine who has them, they're not rights anymore.
Popular sovereignty = a slaver's strategy.
That's what makes them rights.
The issue is about trans rights, and the rights of all people.
As soon as you allow people to vote on them, or to allow public opinion to determine who has them, they're not rights anymore.
Popular sovereignty = a slaver's strategy.
POLLSTER: voters prefer Dems over GOP approach to trans issues "by a two-to-one margin"
January 15, 2026 at 8:46 PM
We. Do. Not. Vote. On. Rights.
That's what makes them rights.
The issue is about trans rights, and the rights of all people.
As soon as you allow people to vote on them, or to allow public opinion to determine who has them, they're not rights anymore.
Popular sovereignty = a slaver's strategy.
That's what makes them rights.
The issue is about trans rights, and the rights of all people.
As soon as you allow people to vote on them, or to allow public opinion to determine who has them, they're not rights anymore.
Popular sovereignty = a slaver's strategy.
You're the leader of the state where the Federal government is waging a terror campaign against your own citizens.
Where is the courage?
Why aren't you out there in the streets?
Why don't they have to go through you to get to your people?
Why aren't you saying, "over my dead body?"
100% cowardice.
Where is the courage?
Why aren't you out there in the streets?
Why don't they have to go through you to get to your people?
Why aren't you saying, "over my dead body?"
100% cowardice.
January 15, 2026 at 5:26 PM
You're the leader of the state where the Federal government is waging a terror campaign against your own citizens.
Where is the courage?
Why aren't you out there in the streets?
Why don't they have to go through you to get to your people?
Why aren't you saying, "over my dead body?"
100% cowardice.
Where is the courage?
Why aren't you out there in the streets?
Why don't they have to go through you to get to your people?
Why aren't you saying, "over my dead body?"
100% cowardice.
It’s time to stop teaching the biggest lie about Hawking radiation
Have you ever heard that #Hawking radiation works by "pair popping" of particles and antiparticles out of the quantum vacuum?
Let's debunk the biggest lie about black hole evaporation.
bigthink.com/starts-with-...
#space #astro
Have you ever heard that #Hawking radiation works by "pair popping" of particles and antiparticles out of the quantum vacuum?
Let's debunk the biggest lie about black hole evaporation.
bigthink.com/starts-with-...
#space #astro
It's time to stop teaching the biggest lie about Hawking radiation
It's not about particle-antiparticle pairs falling into or escaping from a black hole. A deeper explanation alters our view of reality.
bigthink.com
January 15, 2026 at 4:25 PM
It’s time to stop teaching the biggest lie about Hawking radiation
Have you ever heard that #Hawking radiation works by "pair popping" of particles and antiparticles out of the quantum vacuum?
Let's debunk the biggest lie about black hole evaporation.
bigthink.com/starts-with-...
#space #astro
Have you ever heard that #Hawking radiation works by "pair popping" of particles and antiparticles out of the quantum vacuum?
Let's debunk the biggest lie about black hole evaporation.
bigthink.com/starts-with-...
#space #astro
New JWST lens survey: can it save the expanding Universe?
How fast is the Universe expanding?
It depends on how you ask it.
That's why a new method, given a huge boost by the (stupidly-named) JWST VENUS survey, is so promising.
bigthink.com/starts-with-...
#space #hubble #astro #JWST
How fast is the Universe expanding?
It depends on how you ask it.
That's why a new method, given a huge boost by the (stupidly-named) JWST VENUS survey, is so promising.
bigthink.com/starts-with-...
#space #hubble #astro #JWST
New JWST lens survey: can it save the expanding Universe?
The VENUS survey isn't about planets at all, but about finding multiply lensed supernovae. The ambition? To save the expanding Universe.
bigthink.com
January 14, 2026 at 4:58 PM
New JWST lens survey: can it save the expanding Universe?
How fast is the Universe expanding?
It depends on how you ask it.
That's why a new method, given a huge boost by the (stupidly-named) JWST VENUS survey, is so promising.
bigthink.com/starts-with-...
#space #hubble #astro #JWST
How fast is the Universe expanding?
It depends on how you ask it.
That's why a new method, given a huge boost by the (stupidly-named) JWST VENUS survey, is so promising.
bigthink.com/starts-with-...
#space #hubble #astro #JWST
This is your chance to tell the NSF how to fix itself.
Say no to the grift of AI datacenters. Say no to putting "quantum" where it has no business. Say no to false metrics. Say no to biotech scams.
Say yes to sustained investments. To fundamental science. To flagship facilities. To STEM education.
Say no to the grift of AI datacenters. Say no to putting "quantum" where it has no business. Say no to false metrics. Say no to biotech scams.
Say yes to sustained investments. To fundamental science. To flagship facilities. To STEM education.
Do you care about the future of the US NSF and science in general? The agency is seeking feedback on the draft Strategic Plan. www.nsf.gov/od/updates/n...
NSF seeks public input on its Fiscal Year (FY) 2026–2030 NSF Strategic Plan
www.nsf.gov
January 13, 2026 at 9:00 PM
This is your chance to tell the NSF how to fix itself.
Say no to the grift of AI datacenters. Say no to putting "quantum" where it has no business. Say no to false metrics. Say no to biotech scams.
Say yes to sustained investments. To fundamental science. To flagship facilities. To STEM education.
Say no to the grift of AI datacenters. Say no to putting "quantum" where it has no business. Say no to false metrics. Say no to biotech scams.
Say yes to sustained investments. To fundamental science. To flagship facilities. To STEM education.
The four paths forward for US scientists in 2026
If you're feeling hopeless about being a scientist in the United States in 2026, know that there are four good paths that can take you forward.
Which one is right for you?
bigthink.com/starts-with-...
#space #science #astro #scientists #usa
If you're feeling hopeless about being a scientist in the United States in 2026, know that there are four good paths that can take you forward.
Which one is right for you?
bigthink.com/starts-with-...
#space #science #astro #scientists #usa
The four paths forward for US scientists in 2026
US science is worth fighting for, but so are the science projects and scientists denied opportunities. Here are 4 paths all worth exploring.
bigthink.com
January 13, 2026 at 5:15 PM
The four paths forward for US scientists in 2026
If you're feeling hopeless about being a scientist in the United States in 2026, know that there are four good paths that can take you forward.
Which one is right for you?
bigthink.com/starts-with-...
#space #science #astro #scientists #usa
If you're feeling hopeless about being a scientist in the United States in 2026, know that there are four good paths that can take you forward.
Which one is right for you?
bigthink.com/starts-with-...
#space #science #astro #scientists #usa
NASA watched this supernova blast expand for 25 years
NASA's Chandra first observed Kepler's supernova remnant back in 2000.
It revisited it four more times, most recently in 2025: 6% of the remnant's lifetime.
Here's what it learned.
bigthink.com/starts-with-...
#space #astro #NASA #Chandra
NASA's Chandra first observed Kepler's supernova remnant back in 2000.
It revisited it four more times, most recently in 2025: 6% of the remnant's lifetime.
Here's what it learned.
bigthink.com/starts-with-...
#space #astro #NASA #Chandra
NASA watched this supernova blast expand for 25 years
Back in 1604, Johannes Kepler discovered the Milky Way's last naked-eye supernova. Here's how NASA's Chandra sees it over the 21st century.
bigthink.com
January 12, 2026 at 4:57 PM
NASA watched this supernova blast expand for 25 years
NASA's Chandra first observed Kepler's supernova remnant back in 2000.
It revisited it four more times, most recently in 2025: 6% of the remnant's lifetime.
Here's what it learned.
bigthink.com/starts-with-...
#space #astro #NASA #Chandra
NASA's Chandra first observed Kepler's supernova remnant back in 2000.
It revisited it four more times, most recently in 2025: 6% of the remnant's lifetime.
Here's what it learned.
bigthink.com/starts-with-...
#space #astro #NASA #Chandra