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anandre.bsky.social
@anandre.bsky.social
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princess-vimentin.bsky.social
Current mood 🧪
#standupforscience #NoKings
“No Kings Since 1776” Wonder Woman punching DJT
June 14, 2025 at 11:29 PM
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mrsbettybowers.bsky.social
America is *so* stupid.
March 14, 2025 at 6:09 AM
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rickylongthread.bsky.social
History repeats itself
March 14, 2025 at 11:34 AM
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hourlycosmos.bsky.social
Cat's Eye Nebula - From Goddard Space Flight Center - https://flic.kr/p/7GLbNG
The Cat's Eye Nebula, one of the first planetary nebulae discovered, also has one of the most complex forms known to this kind of nebula. Eleven rings, or shells, of gas make up the Cat's Eye. The full beauty of the Cat's Eye Nebula is revealed in this detailed view from NASA's Hubble Space Telescope. The image from Hubble's Advanced Camera for Surveys (ACS) shows a bull's eye pattern of eleven or even more concentric rings, or shells, around the Cat's Eye. Each 'ring' is actually the edge of a spherical bubble seen projected onto the sky -- that's why it appears bright along its outer edge. Observations suggest the star ejected its mass in a series of pulses at 1,500-year intervals. These convulsions created dust shells, each of which contain as much mass as all of the planets in our solar system combined (still only one percent of the Sun's mass). These concentric shells make a layered, onion-skin structure around the dying star. The view from Hubble is like seeing an onion cut in half, where each skin layer is discernible. The bull's-eye patterns seen around planetary nebulae come as a surprise to astronomers because they had no expectation that episodes of mass loss at the end of stellar lives would repeat every 1,500 years. Several explanations have been proposed, including cycles of magnetic activity somewhat similar to our own Sun's sunspot cycle, the action of companion stars orbiting around the dying star, and stellar pulsations. Another school of thought is t...
March 15, 2025 at 4:00 AM