Starship Asterisk*

[quote=gillygoose19 post_id=308303 time=1606107847]where is it located[/quote]
[quote="APOD Robot" post_id=296467 time=1572062776 user_id=128559]
[url=https://apod.nasa.gov/apod/ap191026.html] [img]https://apod.nasa.gov/apod/calendar/S_191026.jpg[/img] [size=150]Gravity's Grin[/size][/url]

[b] Explanation: [/b]... The Cheshire Cat [url=http://www.gutenberg.org/files/11/11-h/11-h.htm]group grins[/url] in the constellation Ursa Major, some 4.6 billion light-years away. ...
[/quote]

where is it located

[float=right][img3="Simple life form"]https://vignette.wikia.nocookie.net/jackinthebox/images/f/f6/Jack.jpg/revision/latest?cb=20130131230939[/img3][/float][quote="Chris Peterson" post_id=296644 time=1572701876 user_id=117706]
[quote=DAMGEM post_id=296638 time=1572674442]

WOULD MOST OR ALL LIFE IN MERGING GALACTIC BODIES BE AT GREAT RISK WITH THE GENERATED TEMPERATURES.[/quote]

The temperatures are high, but the energy density is low. The energies involved would pose little or no risk. The primary risk would be in areas of high star density, where gravitational perturbations could alter planetary orbits, which would be disastrous for complex life, and possibly even for simple life.[/quote]

[quote=DAMGEM post_id=296638 time=1572674442]
WOULD MOST OR ALL LIFE IN MERGING GALACTIC BODIES BE AT GREAT RISK WITH THE GENERATED TEMPERATURES.
[/quote]

The temperatures are high, but the energy density is low. The energies involved would pose little or no risk. The primary risk would be in areas of high star density, where gravitational perturbations could alter planetary orbits, which would be disastrous for complex life, and possibly even for simple life.

WOULD MOST OR ALL LIFE IN MERGING GALACTIC BODIES BE AT GREAT RISK WITH THE GENERATED TEMPERATURES.

[img2]https://mk0astronomynow9oh6g.kinstacdn.com/wp-content/uploads/2015/11/cheshire_cat_940x400-326x245.jpg[/img2][img2]https://vignette.wikia.nocookie.net/jackinthebox/images/f/f6/Jack.jpg/revision/latest?cb=20130131230939[/img2]



I was thinking it might be distant intelligent life just starting to get into intergalactic fast food advertising.

I was thinking more along the lines of Happy Hallowe'en from Interstellar Space.

[url=https://chandra.harvard.edu/photo/2015/cheshirecat/][b][i]CXC: Where Alice in Wonderland Meets Albert Einstein[/i][/b][/url]

[quote="rj rl" post_id=296480 time=1572086377 user_id=141155]
Not a chance that it's related to the merger?
[/quote]

The different elements are at vastly different distances from each other.

today's APOD makes a nice smiley face! :D

Not a chance that it's related to the merger?

[quote="rj rl" post_id=296477 time=1572079313 user_id=141155]
What's the bright glowing blob near the right edge?
[/quote]

Since the blob at right is purple, and since purple in this image means X-rays, it is an X-ray source of some kind. It could conceivably be a brilliant distant AGN whose galaxy is too faint to show up, or it could, perhaps, be a local magnetar or neutron star.

Ann

What's the bright glowing blob near the right edge?

[float=left][img2]https://mk0astronomynow9oh6g.kinstacdn.com/wp-content/uploads/2015/11/cheshire_cat_940x400-326x245.jpg[/img2][c][size=85]X-ray - NASA/CXC/J. Irwin et al. ; Optical - NASA/STScI[/size][/c][/float][float=right][img2]https://ih0.redbubble.net/image.640089657.8001/flat,550x550,075,f.u5.jpg[/img2][c][size=85]Poster by janneman99|redbubble[/size][/c][/float]



















Yes, in the end only the cosmic gravity grin remains!

Ann

[url=https://apod.nasa.gov/apod/ap191026.html] [img]https://apod.nasa.gov/apod/calendar/S_191026.jpg[/img] [size=150]Gravity's Grin[/size][/url]

[b] Explanation: [/b] [url=https://en.wikipedia.org/wiki/List_of_scientific_publications_by_Albert_Einstein]Albert Einstein's[/url] general theory of relativity, published over 100 years ago, predicted the phenomenon of gravitational lensing. And that's what gives these distant galaxies such a whimsical appearance, [url=http://chandra.harvard.edu/photo/2015/cheshirecat/]seen through the looking glass[/url] of X-ray and optical image data from the Chandra and Hubble space telescopes. Nicknamed the Cheshire Cat galaxy group, the group's two large elliptical galaxies are suggestively framed by arcs. [url=https://apod.nasa.gov/apod/ap111221.html]The arcs are optical images[/url] of distant background galaxies lensed by the foreground group's total distribution of gravitational mass. Of course, that gravitational mass is dominated [url=https://www.lsst.org/science/dark-matter]by dark matter[/url]. The two large elliptical "eye" galaxies represent the brightest members of their own galaxy groups which are merging. Their relative collisional speed of nearly 1,350 kilometers/second heats gas to millions of degrees producing the X-ray glow shown in purple hues. [url=http://arxiv.org/abs/1505.05501]Curiouser[/url] about galaxy group mergers? The Cheshire Cat [url=http://www.gutenberg.org/files/11/11-h/11-h.htm]group grins[/url] in the constellation Ursa Major, some 4.6 billion light-years away.


[table][tr][td=left][url=http://asterisk.apod.com/discuss_apod.php?date=191025][b]<< Previous APOD[/b][/url][/td] [td=center][url=http://asterisk.apod.com/view_retro.php?date=1026][b]This Day in APOD[/b][/url][/td] [td=right][url=http://asterisk.apod.com/discuss_apod.php?date=191027][b]Next APOD >>[/b][/url][/td][/tr][/table]