Geraint F. Lewis
@cosmichorizons.bsky.social
Cosmologist & Galactic Archaeologist at
@Sydney_Uni. Proud Silurian, Australian immigrant, & author of books about the strange universe we find ourselves in!
@Sydney_Uni. Proud Silurian, Australian immigrant, & author of books about the strange universe we find ourselves in!
They don't do Guy Fawkes in Australia (but I discovered this weekend that they do in New Zealand). But do we celebrate because he was captured, and the gunpowder plot failed, or because he tried?
November 5, 2025 at 10:39 PM
They don't do Guy Fawkes in Australia (but I discovered this weekend that they do in New Zealand). But do we celebrate because he was captured, and the gunpowder plot failed, or because he tried?
Oh I just give up (this was on ABC in Australia, source apparently NASA). And every time anyone calls these moons by a stupid name like Beaver, a small astronomy fairy dies.
November 5, 2025 at 10:22 PM
Oh I just give up (this was on ABC in Australia, source apparently NASA). And every time anyone calls these moons by a stupid name like Beaver, a small astronomy fairy dies.
Dear palaeontologist - please feel free to chat to astronomers about how orbits work so you don’t end up with gaffes like this in your books,
November 5, 2025 at 7:11 PM
Dear palaeontologist - please feel free to chat to astronomers about how orbits work so you don’t end up with gaffes like this in your books,
I am dipping my toes into Fast Radio Burst research, and I discovered they have a "sad trombone effect".
November 5, 2025 at 6:52 AM
I am dipping my toes into Fast Radio Burst research, and I discovered they have a "sad trombone effect".
Getting ready for my talk in Auckland tomorrow night
October 30, 2025 at 10:21 PM
Getting ready for my talk in Auckland tomorrow night
Getting one of these off a group of students you have supervised for a year really means something to me.
October 28, 2025 at 8:13 PM
Getting one of these off a group of students you have supervised for a year really means something to me.
Time to start posting current reading
October 24, 2025 at 9:50 PM
Time to start posting current reading
Why do you think we ignore evolution? We wrote about it in our book and in this article. Evolution doesn't save you if there's not even the raw material for life to form - www.royalsoc.org.au/wp-content/u...
October 1, 2025 at 7:23 AM
Why do you think we ignore evolution? We wrote about it in our book and in this article. Evolution doesn't save you if there's not even the raw material for life to form - www.royalsoc.org.au/wp-content/u...
Thursday afternoon deep thought...
September 11, 2025 at 3:48 AM
Thursday afternoon deep thought...
Even after being in this country for quarter of a century, bumping into these guys still make me smile.
August 30, 2025 at 7:49 AM
Even after being in this country for quarter of a century, bumping into these guys still make me smile.
Having fun "vibe mathing" with copilot tonight. I think I'm at the limit of known mathematics and about to break through into something new!
August 24, 2025 at 8:01 AM
Having fun "vibe mathing" with copilot tonight. I think I'm at the limit of known mathematics and about to break through into something new!
Spotted at Central Station, Sydney - that's quite a train ride.
August 13, 2025 at 6:34 AM
Spotted at Central Station, Sydney - that's quite a train ride.
Spotted at Central Station, Sydney - that's quite a train ride.
August 13, 2025 at 6:32 AM
Spotted at Central Station, Sydney - that's quite a train ride.
Not sure the word "Even" is necessary in this headline!
August 13, 2025 at 12:14 AM
Not sure the word "Even" is necessary in this headline!
Being the 80th anniversary of the bombing of #Hiroshima, this image is doing the rounds as a flash shadow of a person. However, I suspect this is not what this is, as it is much more distinct than other shadows and doesn't appear to have a history before 10-15 yrs ago. Anyone have details?
August 6, 2025 at 12:21 PM
Being the 80th anniversary of the bombing of #Hiroshima, this image is doing the rounds as a flash shadow of a person. However, I suspect this is not what this is, as it is much more distinct than other shadows and doesn't appear to have a history before 10-15 yrs ago. Anyone have details?
Did anyone get the memo that we should be rethinking the origins of the universe? I seem to have missed it.
July 29, 2025 at 12:23 AM
Did anyone get the memo that we should be rethinking the origins of the universe? I seem to have missed it.
A little Saturday afternoon culture at the Parramatta Riverside Theatre - and excellent play!
July 26, 2025 at 8:56 AM
A little Saturday afternoon culture at the Parramatta Riverside Theatre - and excellent play!
46 years apart - always part of my Cambridge pilgrimage.
July 12, 2025 at 10:55 PM
46 years apart - always part of my Cambridge pilgrimage.
Not everyday you get to see the original model of DNA!
July 4, 2025 at 1:16 PM
Not everyday you get to see the original model of DNA!
Back in my homeland
June 30, 2025 at 8:09 PM
Back in my homeland
Talk at CosmoVerse in Istanbul done! #cosmology
June 24, 2025 at 12:33 PM
Talk at CosmoVerse in Istanbul done! #cosmology
Street art in Goelitz
June 17, 2025 at 2:06 PM
Street art in Goelitz
Space street art in Strasbourg
June 13, 2025 at 6:26 AM
Space street art in Strasbourg
"Existential panic" - no one told me I should be panicking!
June 11, 2025 at 9:17 AM
"Existential panic" - no one told me I should be panicking!
Oh, the delicious juxtaposition....
June 9, 2025 at 4:35 PM
Oh, the delicious juxtaposition....