Starship Asterisk*

Roy wrote: ↑Tue Jul 23, 2024 2:11 pm Looks like two annular rings with a jet or ejection down from the center.
Anyway, we can calculate the average expansion velocity of the nebula - given a diameter of 10 ly, radius of 5 ly, 946 years from first observed to image referenced for Hubble visible light (2000 - 1054) = 1585 kilometers per second. Enormous amount of energy released to start that off.

Sa Ji Tario wrote: ↑Tue Jul 23, 2024 2:43 pm

Roy wrote: ↑Tue Jul 23, 2024 2:11 pm Looks like two annular rings with a jet or ejection down from the center.
Anyway, we can calculate the average expansion velocity of the nebula - given a diameter of 10 ly, radius of 5 ly, 946 years from first observed to image referenced for Hubble visible light (2000 - 1054) = 1585 kilometers per second. Enormous amount of energy released to start that off.

There are stars that generate winds of 2,000-3,000 k/s

Ann wrote: ↑Tue Jul 23, 2024 6:17 am

The Crab Nebula from Visible to X-Ray Image Credit: NASA, ESA, ASI, Hubble, Chandra, IXPE

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Anyway, NASA had better make good use of the Chandra X-ray Telescope now before they retire it. It is such a shame that Chandra will be decommissioned, because the telescope has performed extremely well, has shown no great signs of aging, and is the best X-ray telescope in existence anywhere, unless I am mistaken.

Ann

Bird_Man wrote: ↑Tue Jul 23, 2024 6:34 pm

Ann wrote: ↑Tue Jul 23, 2024 6:17 am

The Crab Nebula from Visible to X-Ray Image Credit: NASA, ESA, ASI, Hubble, Chandra, IXPE

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Anyway, NASA had better make good use of the Chandra X-ray Telescope now before they retire it. It is such a shame that Chandra will be decommissioned, because the telescope has performed extremely well, has shown no great signs of aging, and is the best X-ray telescope in existence anywhere, unless I am mistaken.

Ann

Ann makes a good point and apparently isn't the only astronomer that thinks it's important to save the Chandra X-ray Telescope. Here is an interesting NPR article on the topic: https://www.npr.org/2024/07/23/nx-s1-50 ... nniversary

Avalon wrote: ↑Wed Jul 24, 2024 2:13 am What a spectacular image! I assume there is another jet shooting out on the other side of the disc? What sets that pulsar rotating so incredibly fast?

APOD Robot wrote: ↑Tue Jul 23, 2024 4:05 am The Crab Nebula from Visible to X-Ray

Explanation: What powers the Crab Nebula? A city-sized magnetized neutron star spinning around 30 times a second. Known as the Crab Pulsar, it is the bright spot in the center of the gaseous swirl at the nebula's core. About 10 light-years across, the spectacular picture of the Crab Nebula (M1) frames a swirling central disk and complex filaments of surrounding and expanding glowing gas. The picture combines visible light from the Hubble Space Telescope in red and blue with X-ray light from the Chandra X-ray Observatory shown in white, and diffuse X-ray emission detected by Imaging X-ray Polarimetry Explorer (IXPE) in diffuse purple. The central pulsar powers the Crab Nebula's emission and expansion by slightly slowing its spin rate, which drives out a wind of energetic electrons. The [url=https://chandra.harvard.edu/photo/2024/25th/more.html" >featured image</a> released today, the <a href="https://chandra.harvard.edu/25th/]25th Anniversary[/url] of the launch of NASA's flagship-class X-ray Observatory: Chandra.

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