Search found 323 matches

by Psnarf
Sun Jun 23, 2024 10:38 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Hubble Deep Field 35 years ago vs today
Replies: 3
Views: 11527

Re: Hubble Deep Field 35 years ago vs today

>...Everything is getting further apart, not closer together If that is indeed the case, then there should be fewer galaxies visible in the same region. I'm just impatient, I hate waiting millions of years for the most distant observable galaxies to either vanish or new ones to appear in a falsifiab...
by Psnarf
Fri Jun 21, 2024 4:57 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Hubble Deep Field 35 years ago vs today
Replies: 3
Views: 11527

Hubble Deep Field 35 years ago vs today

If Hubble made the same observation of the Deep Field horizon today, would a new image reveal galaxies that were not yet visible thirty five years ago? Is 35 light years a reasonable distance between the most distant galaxies of the original image?
-(signed) Congenitally Clueless
by Psnarf
Tue Nov 28, 2023 6:54 pm
Forum: The Observation Deck: Latest Sky Photography
Topic: Submissions: 2023 November
Replies: 62
Views: 267867

Re: Submissions: 2023 November

NASA’s Webb Reveals New Features in Heart of Milky Way

https://www.nasa.gov/missions/webb/nasa ... milky-way/
webb-stsci-01hfchzpbwn55y58dcskmd73k1.jpg
by Psnarf
Sun Oct 08, 2023 6:56 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Primordial Hum
Replies: 6
Views: 19892

Re: Primordial Hum

If there were equal parts of matter particles and anti-matter particles way back when, why didn't everything just annihilate leaving no particles at all? The fact that we now find a lot more matter than anti-matter, suggests something separated the remaining particles at some point in time. Perhaps ...
by Psnarf
Sun Oct 08, 2023 6:46 pm
Forum: The Asterisk Café: Discuss Anything Astronomy Related
Topic: Primordial Hum
Replies: 6
Views: 19892

Primordial Hum

"In the first few hundred thousand years after our Universe was born, a primordial hum ripped through a plasma of superheated particles. Scientists are listening in with the hope of gaining new insights about the mysterious force known as dark energy." https://www.bbc.com/future/article/20...
by Psnarf
Tue Apr 27, 2021 4:29 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Animation: Black Hole Destroys Star (2021 Apr 27)
Replies: 26
Views: 14176

Re: APOD: Animation: Black Hole Destroys Star (2021 Apr 27)

In the linked article on the neutrino, the observatory "spotted a neutrino with relatively high energy that appeared to come from beyond our galaxy." How can you tell from where a particular neutrino came? Is there some characteristic of intra-galactic neutrinos different than a Milky-Way ...
by Psnarf
Sun Oct 18, 2020 5:28 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: UGC 1810: Wildly Interacting Galaxy... (2020 Oct 18)
Replies: 16
Views: 5627

Re: APOD: UGC 1810: Wildly Interacting Galaxy... (2020 Oct 18)

The hot blue stars "have formed only in the past few million years" yet the galaxy is "300 million light years away." Sew! the hot blue stars formed in the galaxy's time frame a couple of million years ago, which we observe 300 million years later, a couple of million years plus ...
by Psnarf
Sun Jul 12, 2020 6:39 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Comet CG Creates Its Dust Tail (2020 Jul 12)
Replies: 13
Views: 3692

Re: APOD: Comet CG Creates Its Dust Tail (2020 Jul 12)

In a few thousand years, after there is nothing left to create jets, Rosetta's remains and the non-watery bits will still follow CG's orbit?
by Psnarf
Wed Apr 01, 2020 4:30 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Asteroid or Potato? (2020 Apr 01)
Replies: 27
Views: 9267

Re: APOD: Asteroid or Potato? (2020 Apr 01)

I thought Congress cancelled All Fools Day as racist, since it refers to them.
Aprilsnar_2001.jpg
by Psnarf
Sat Mar 07, 2020 2:54 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Pic du Midi Panorama (2020 Mar 07)
Replies: 6
Views: 3920

Re: APOD: Pic du Midi Panorama (2020 Mar 07)

Does not the Dark Sky program mandate sodium lights? Is not the nearby light pollution attenuated or eliminated by sodium filters?
by Psnarf
Sat Mar 07, 2020 3:40 am
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Mars Panorama from Curiosity (2020 Mar 06)
Replies: 25
Views: 6761

Re: APOD: Mars Panorama from Curiosity (2020 Mar 06)

I'm amazed at the fine detail. It's like standing there. We really need to insert a huge electromagnet at the L1 point to protect against the solar wind. Only then will the atmosphere return.
by Psnarf
Mon Mar 02, 2020 9:15 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Sharpless-308: The Dolphin Nebula (2020 Mar 02)
Replies: 16
Views: 5738

Re: APOD: Sharpless-308: The Dolphin Nebula (2020 Mar 02)

I still believe it is a space phage in the process of engulfing and consuming its prey. PN G234.9-09.7 is it's youngling.
by Psnarf
Wed Feb 19, 2020 6:02 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: UGC 12591: The Fastest Rotating... (2020 Feb 19)
Replies: 30
Views: 8124

Re: APOD: UGC 12591: The Fastest Rotating... (2020 Feb 19)

The dust lanes appear circular, not spiral, like a pebble dropped into calm waters. Gravity waves from the super-massive black hole? I don't believe in dark matter, methinks the gravitational effects of the black hole are severely underestimated, but then, my feeble understanding of such matters dis...
by Psnarf
Wed Jan 15, 2020 3:02 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Iridescent Clouds over Sweden (2020 Jan 15)
Replies: 13
Views: 4957

Re: APOD: Iridescent Clouds over Sweden (2020 Jan 15)

Does the term 'clouds clouds' refer to the atmospheric clouds and the reflection of the clouds?
by Psnarf
Sun Jan 12, 2020 8:04 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Stars and Dust in Corona Australis (2020 Jan 12)
Replies: 19
Views: 5993

Re: APOD: Stars and Dust in Corona Australis (2020 Jan 12)

Thanks, Ann! I had no idea they were so close together. Could go to such gas clouds an refill the oxygen tanks. Not that such a consummation would be necessary. Probably will use a closed hydrogen-based system, burn hydrogen to get water, then separate the water into hydrogen and oxygen.
- Hank
by Psnarf
Sun Jan 12, 2020 7:33 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Stars and Dust in Corona Australis (2020 Jan 12)
Replies: 19
Views: 5993

Re: APOD: Stars and Dust in Corona Australis (2020 Jan 12)

I didn't know you were bluish. Just wondering, about how far apart are the glowing particles of such dust or gas fields?
by Psnarf
Sat Dec 14, 2019 5:28 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Interstellar Comet 2I/Borisov (2019 Dec 14)
Replies: 38
Views: 38327

Re: APOD: Interstellar Comet 2I/Borisov (2019 Dec 14)

290 million km is somewhere in the middle of the asteroid belt.
https://svs.gsfc.nasa.gov/4758
Collision would be nice, maybe send some pieces our way to study?
by Psnarf
Sat Oct 05, 2019 3:30 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Jupiter and the Moons (2019 Oct 05)
Replies: 10
Views: 6638

Re: APOD: Jupiter and the Moons (2019 Oct 05)

What is that dot just to the right of the Moon, Saturn?
by Psnarf
Thu Oct 03, 2019 2:51 pm
Forum: Open Space: Discuss Anything
Topic: How BAD is Climate Change Going To Be?
Replies: 15
Views: 9156

Re: How BAD is Climate Change Going To Be?

In a thousand years, the Northern Hemisphere will be tilted toward the sun at perihelion. Things will be pretty hot thenabouts. Did humans cause the miles-thick ice sheets that carved out the Great Lakes, Hudson River Valley, Columbia River Valley, to melt? What about the interglacial warming period...
by Psnarf
Thu Oct 03, 2019 2:40 pm
Forum: The Communications Center: Breaking Science News
Topic: NASA/JPL: Spitzer Spots a Starry Region Bursting With Bubbles
Replies: 1
Views: 1671

Re: NASA/JPL: Spitzer Spots a Starry Region Bursting With Bubbles

APOD suggestion: Image 1 with mouse-over image2, just like bystander's image above.
by Psnarf
Wed Sep 18, 2019 4:12 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Gigantic Jet Lightning over India (2019 Sep 18)
Replies: 19
Views: 6425

Re: APOD: Gigantic Jet Lightning over India (2019 Sep 18)

I did not know that elves were directly connected to a lightning bolt. Am I correct in postulating the tip of the bright bolt marks the boundary between the stratosphere and ionosphere? Is the violet color from ionized nitrogen?
by Psnarf
Fri Aug 30, 2019 3:03 pm
Forum: The Bridge: Discuss an Astronomy Picture of the Day
Topic: APOD: Animation: Spiral Disk around a Hole... (2019 Aug 20)
Replies: 18
Views: 12245

Re: APOD: Animation: Spiral Disk around a Hole... (2019 Aug 20)

If the particles in the accretion disk are "like a liquid swirling around a drain," does it not then follow that all of the stars in the galaxy behave in much the same way? That is, will the stars orbiting the central super-massive black hole eventually approach and fall into the hole? Is ...