Happy Pi Day.
Search found 607 matches
- Thu Mar 14, 2024 8:15 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Moon Pi and Mountain Shadow (2024 Mar 14)
- Replies: 1
- Views: 649
- Tue Feb 27, 2024 7:37 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Supernova Remnant Simeis 147 (2024 Feb 27)
- Replies: 19
- Views: 1652
Re: APOD: Supernova Remnant Simeis 147 (2024 Feb 27)
These filaments are very dim. The brighter ones are visible to the eye through a telescope, barely, and largely because we detect the faint contrast with the surrounds. If we were closer, it would not be brighter, but we'd lose that contrast. If we were at the nebula, we'd see nothing. Analogous to...
- Mon Feb 05, 2024 11:38 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: In the Core of the Carina Nebula (2024 Feb 05)
- Replies: 13
- Views: 4102
Re: APOD: In the Core of the Carina Nebula (2024 Feb 05)
What is HOS Foraxx (bottom left corner)?
- Tue Apr 18, 2023 7:52 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Map of Total Solar Eclipse Path in... (2023 Apr 18)
- Replies: 8
- Views: 2490
Re: APOD: Map of Total Solar Eclipse Path in... (2023 Apr 18)
As a warmup, an annular solar eclipse will be visible later this year -- in mid-October. https://c.tadst.com/gfx/eclipses2/20231014/path2d-380.png The October eclipse is unusually friendly to many more countries. Lots of people should be able to enjoy that one, including Central and South America.
- Thu Feb 16, 2023 2:36 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Airglow Sky over France (2023 Feb 15)
- Replies: 15
- Views: 5181
Re: APOD: Airglow Sky over France (2023 Feb 15)
The striped bands are called airglow and they result from air high in Earth's atmosphere being excited by the Sun's light and emitting a faint light of its own. The bands cross the entire sky … Even at the best ground-based observatories, airglow limits the photosensitivity of optical telescopes. P...
- Fri Nov 04, 2022 3:38 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: InSight's Final Selfie (2022 Nov 04)
- Replies: 14
- Views: 3099
Re: APOD: InSight's Final Selfie (2022 Nov 04)
Still, I hope we get to see some innovations in future missions that try methods of removing dust from solar panels. Even if such a method works only once, then it could double the lifetime. “Planned lifetime” is a way to limit engineering efforts/experiments and lander weight. Dust on solar panels ...
- Fri Oct 07, 2022 10:10 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: In Ganymede's Shadow (2022 Oct 07)
- Replies: 13
- Views: 3700
Re: APOD: In Ganymede's Shadow (2022 Oct 07)
Ross Pomeroy of Real Clear Scienc e wrote: 4. What's Up With Jupiter? […] Moreover, he writes, most gas giants in other solar systems have tight, eccentric orbits around their stars, while Jupiter's is wide and nearly circular. "Only about one in a hundred stars like the Sun has a Jupiter like...
- Sun Aug 14, 2022 8:52 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: 4000 Exoplanets (2022 Aug 14)
- Replies: 26
- Views: 11901
Re: APOD: 4000 Exoplanets (2022 Aug 14)
The Open Exoplanet Catalog currently lists 4769 confirmed exoplanets.
The NASA Exoplanet Archive currently lists 5069 confirmed exoplanets.
The Extrasolar Planets Encyclopaedia currently lists 5147 confirmed exoplanets.
All these also have a backlog of unconfirmed candidates.
The NASA Exoplanet Archive currently lists 5069 confirmed exoplanets.
The Extrasolar Planets Encyclopaedia currently lists 5147 confirmed exoplanets.
All these also have a backlog of unconfirmed candidates.
- Fri May 13, 2022 10:45 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Milky Way's Black Hole (2022 May 13)
- Replies: 63
- Views: 45020
- Wed Apr 13, 2022 3:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Milky Way over Devils Tower (2022 Apr 13)
- Replies: 4
- Views: 2750
Re: APOD: Milky Way over Devils Tower (2022 Apr 13)
“This means something. This is important.” – Roy Neary
Click to play embedded YouTube video.
- Sat Feb 19, 2022 4:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Peculiar Galaxies of Arp 273 (2022 Feb 19)
- Replies: 22
- Views: 20513
Re: APOD: Peculiar Galaxies of Arp 273 (2022 Feb 19)
https://i.imgur.com/opxyf69.png Does anybody know if that beautiful bright golden star to the left in the photo is H14511? HD 14511, yes. An 8.8 magnitude G5 star¹ at 444 parsec (1448 light-years) distance, as derived from Gaia data . (Previous estimates put it farther away.) [¹ thought to be a bin...
- Sun Aug 15, 2021 12:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Perseid Rain (2021 Aug 15)
- Replies: 5
- Views: 2762
Re: APOD: Perseid Rain (2021 Aug 15)
What a creative composition! I like it.
- Sun Apr 11, 2021 1:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: When Black Holes Collide (2021 Apr 11)
- Replies: 23
- Views: 5651
Re: APOD: When Black Holes Collide (2021 Apr 11)
As you probably know, the signal has been converted to audible wavelengths, to let us hear a ‘chirp’ sound of the merger.
https://www.ligo.caltech.edu/video/ligo20160211v2
- Tue Dec 15, 2020 10:51 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Great Conjunction: Saturn and... (2020 Dec 15)
- Replies: 31
- Views: 10666
Re: APOD: Great Conjunction: Saturn and... (2020 Dec 15)
A tough one, so close to the setting Sun, so close to the horizon. On the other hand, this one is not about planetary surface details.
- Tue Oct 13, 2020 1:54 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Mars, Pleiades, and Andromeda over... (2020 Oct 13)
- Replies: 13
- Views: 4270
Re: APOD: Mars, Pleiades, and Andromeda over... (2020 Oct 13)
https://i.imgur.com/yRZppGc.jpg There is one more planet in the image: Uranus. The image also captures four more interesting but originally unlabeled deep sky objects. The planet Uranus is listed in Stellarium as magnitude 5.69 at the time of the photo. Open cluster NGC 1342 is also known as the Li...
- Fri Oct 09, 2020 11:46 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Very Large Array at Moonset (2020 Oct 09)
- Replies: 12
- Views: 4584
Re: APOD: The Very Large Array at Moonset (2020 Oct 09)
Click to play embedded YouTube video.
- Tue Aug 18, 2020 2:21 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: TYC 8998-760-1: Multiple Planets a... (2020 Aug 18)
- Replies: 29
- Views: 17862
Re: APOD: TYC 8998-760-1: Multiple Planets a... (2020 Aug 18)
So I take it that the other dots are confirmed to not be planets of that system then? Background stars or artefacts?
Very cool, ESO team!
Very cool, ESO team!
- Wed Aug 05, 2020 9:37 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 2442: Galaxy in Volans (2020 Aug 04)
- Replies: 19
- Views: 11046
Re: APOD: NGC 2442: Galaxy in Volans (2020 Aug 04)
A nice ‘S’ for the galactic alphabet.
- Tue Jun 30, 2020 12:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Bright Planetary Nebula NGC 7027... (2020 Jun 30)
- Replies: 31
- Views: 9657
Re: APOD: Bright Planetary Nebula NGC 7027... (2020 Jun 30)
Perhaps not a very popular nebula, but it has been featured here before:
https://apod.nasa.gov/apod/ap180109.html
https://apod.nasa.gov/apod/ap130826.html
https://apod.nasa.gov/apod/ap980325.html
https://apod.nasa.gov/apod/ap960117.html
https://apod.nasa.gov/apod/ap180109.html
https://apod.nasa.gov/apod/ap130826.html
https://apod.nasa.gov/apod/ap980325.html
https://apod.nasa.gov/apod/ap960117.html
- Mon Jun 22, 2020 8:42 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Moon Mountains Magnified during Ring... (2020 Jun 22)
- Replies: 6
- Views: 3571
Re: APOD: Moon Mountains Magnified during Ring... (2020 Jun 22)
What a beautiful and creative composition!
I watched the webcast yesterday from timeanddate.com with several feeds along the path, and what struck me first was how thin the ‘ring of fire’ was, compared to other recent annular eclipses.
I watched the webcast yesterday from timeanddate.com with several feeds along the path, and what struck me first was how thin the ‘ring of fire’ was, compared to other recent annular eclipses.
- Wed Jun 17, 2020 10:17 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Magnetic Streamlines of the Milky Way (2020 Jun 17)
- Replies: 22
- Views: 9035
Re: APOD: Magnetic Streamlines of the Milky Way (2020 Jun 17)
Can't resist comparing the magnetic streamlines of the Milky Way with the post-impressionist swirly painting style of Van Gogh.
- Sat Mar 28, 2020 10:42 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Stars Trail over Ragusa (2020 Mar 28)
- Replies: 40
- Views: 14746
Re: APOD: Stars Trail over Ragusa (2020 Mar 28)
When zoomed in, the individual exposures seem to be resolved. Fascinating! Not sure why they’re stripes instead of dots.
From the angle of the arcs (about 24.5°), I deduce 98 minutes between beginning and end.
From the angle of the arcs (about 24.5°), I deduce 98 minutes between beginning and end.
- Sat Feb 22, 2020 11:05 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Central Centaurus A (2020 Feb 22)
- Replies: 9
- Views: 2723
Re: APOD: Central Centaurus A (2020 Feb 22)
For orientation:
- Wed Feb 05, 2020 12:48 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Lunar Eclipse Perspectives (2020 Feb 05)
- Replies: 23
- Views: 21776
- Fri Nov 01, 2019 8:39 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Day After Mars (2019 Nov 01)
- Replies: 34
- Views: 9287
Re: APOD: The Day After Mars (2019 Nov 01)
Mars looks very bright in this picture. Was Mars actually close to Earth when this picture was taken? Or does Mars look so bright because it was just so much brighter than the tiny little comet? According to Stellarium, Mars was at mag 0.87 and 1.632 AU distance, at that time. Mars can be at mag -2...