That’s a rather broad definition of “human.” 6 million years ago is when our lineage split from the chimpanzee/bonobo lineage, so this definition would include Australopithecus and Ardipithecus. I’ll take it, though.APOD Robot wrote: ↑Mon Jul 01, 2024 4:06 am Humans first appeared only about 6 million years ago, ...
Search found 445 matches
- Mon Jul 01, 2024 1:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Time Spiral (2024 Jul 01)
- Replies: 35
- Views: 1433
Re: APOD: Time Spiral (2024 Jul 01)
- Mon Jul 01, 2024 1:34 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Earthrise: A Video Reconstruction (2024 Jun 30)
- Replies: 27
- Views: 1545
Re: APOD: Earthrise: A Video Reconstruction (2024 Jun 30)
(but - oh the heresy! - the video cuts out the last chord of that Bach piece!) (which can also be heard on Voyager's Golden Record) I came here just to say this! Not heresy, but MAJOR cringe! I think that would produce the same effect for ANY song on fans of that song's genre. I assume that was acc...
- Fri May 31, 2024 4:41 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Nebulous Realm of WR 134 (2024 May 31)
- Replies: 32
- Views: 5388
Re: APOD: The Nebulous Realm of WR 134 (2024 May 31)
It looks like the mouth of a sandworm (Villeneuve version).
- Sun May 05, 2024 4:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
- Replies: 29
- Views: 2049
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
If the star directly impacts a massive black hole , then the star falls in completely -- and everything vanishes. This, of course, is not what is illustrated, but it has me wondering: if the black hole is rotating (which probably most are), is a direct impact even possible? My understanding is that...
- Sun May 05, 2024 4:47 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
- Replies: 29
- Views: 2049
Re: APOD: A Black Hole Disrupts a Passing Star (2024 May 05)
This exchange made me smile.
![:) :ssmile:](./images/smilies/smile.gif)
- Fri May 03, 2024 5:10 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
- Replies: 25
- Views: 1726
Re: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
I find it interesting that the trailing side is slightly hotter than the leading side.
- Fri May 03, 2024 5:04 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
- Replies: 25
- Views: 1726
Re: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
I appreciate NASA is an American agency which is beholden to increasing interest in space for Americans but I would appreciate having the courtesy of having conversions to metric units in brackets after the imperial ones, for the benefit of us international readers. I agree. But I also think in thi...
- Fri May 03, 2024 4:53 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
- Replies: 25
- Views: 1726
Re: APOD: Temperatures on Exoplanet WASP-43b (2024 May 03)
You'd think at that orbital distance, the parent star would either wick matter from WASP-43b, or cause the orbit to decay until the planet broke apart, or given time, both. I'm no astrophysicist, though..... :' ) The sizes in the diagram are not to scale. 2 million km is large compared to the sizes...
- Wed Apr 17, 2024 5:09 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Total Eclipse and Comets (2024 Apr 17)
- Replies: 25
- Views: 2248
Re: APOD: Total Eclipse and Comets (2024 Apr 17)
I saw Jupiter (not shown) and Venus. The sky was too cloudy to see Mercury or 12/P, even through a binocular.
I did see solar prominences for the first time ever, though!
I did see solar prominences for the first time ever, though!
- Mon Mar 25, 2024 1:17 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: What did you see in the sky tonight?
- Replies: 1303
- Views: 1103367
Re: What did you see in the sky tonight?
Was anyone able to see a brightness gradient on last night’s eclipse? I couldn’t.
- Fri Mar 22, 2024 1:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Phobos: Moon over Mars (2024 Mar 22)
- Replies: 8
- Views: 2175
Re: APOD: Phobos: Moon over Mars (2024 Mar 22)
It completes one orbit in just 7 hours and 39 minutes. That's faster than a Mars rotation, which corresponds to about 24 hours and 40 minutes. So on Mars, Phobos can be seen to rise above the western horizon 3 times a day. This is better expressed “up to 3 times a day.” Since Mars is also rotating,...
- Fri Mar 22, 2024 1:14 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Phobos: Moon over Mars (2024 Mar 22)
- Replies: 8
- Views: 2175
Re: APOD: Phobos: Moon over Mars (2024 Mar 22)
The caption states that Phobos has traveled from the first dot on the right to the first dot on the left in 22 minutes. It has also stated that Mars is rotating faster than Phobos is traveling. How can Hubble keep Mars in focus if it is spinning at that speed? Read it again: “It completes one orbit...
- Sat Mar 09, 2024 4:52 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Comet Pons-Brooks in Northern Spring (2024 Mar 09)
- Replies: 6
- Views: 1325
Re: APOD: Comet Pons-Brooks in Northern Spring (2024 Mar 09)
Finally, the caption contains a mistake. APOD Robot wrote: In the sky above the Halley-type comet, the Andromeda (right) and Triangulum galaxies flank bright star Mirach, beta star of the constellation Andromeda. This is correct, but when it is put like this, it may lead you to believe that the Tri...
- Sat Mar 02, 2024 10:02 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Odysseus on the Moon (2024 Mar 02)
- Replies: 6
- Views: 12758
Re: APOD: Odysseus on the Moon (2024 Mar 02)
“Odysseus' gentle lean into a sloping lunar surface preserved the phone booth-sized lander's ability to operate, “ A phone booth is going to be a foreign concept for anyone under the age of 50…..lol. Unfortunately I am familiar with phone booths :-). This was discussed a few days ago. A few other, ...
- Mon Feb 26, 2024 1:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Martian Moon Eclipses Martian Moon (2024 Feb 26)
- Replies: 17
- Views: 2408
Re: APOD: Martian Moon Eclipses Martian Moon (2024 Feb 26)
According to https://ssd.jpl.nasa.gov/horizons/app.html#/, the orbital period of Deimos is 1.263 Earth days (30.312 hours), which is longer than a Martian day. Therefore, Deimos would rise in the east, albeit very slowly. [Robert posted the text below. Thanks, Robert! —CR] Yes, this is correct. Than...
- Tue Feb 20, 2024 2:21 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: AM1054: Stars Form as Galaxies Collide (2024 Feb 20)
- Replies: 24
- Views: 2560
Re: APOD: AM1054: Stars Form as Galaxies Collide (2024 Feb 20)
If this isn’t already called the Question Mark Galaxy, it should be.
- Tue Feb 13, 2024 3:31 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A January Wolf Moon (2024 Feb 13)
- Replies: 10
- Views: 1530
Re: APOD: A January Wolf Moon (2024 Feb 13)
The one hopefully constructive criticism I have is that the Moon doesn’t look bright enough to light up its surroundings to the extent shown in this composite. A more subtle means of capturing the dynamic range, as is done with photos of the corona during a total solar eclipse, would be helpful.
- Tue Feb 13, 2024 3:15 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A January Wolf Moon (2024 Feb 13)
- Replies: 10
- Views: 1530
- Wed Jan 31, 2024 1:55 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Camera Orion Rising (2024 Jan 31)
- Replies: 10
- Views: 13555
Re: APOD: Camera Orion Rising (2024 Jan 31)
I believe you are correct. And Ann can remove the question mark from the lower image.johanlf wrote: ↑Wed Jan 31, 2024 12:15 pm label error : the bright star on the lower left is not Sirius but Procyon. Checked on star chart.
- Wed Jan 31, 2024 1:51 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Camera Orion Rising (2024 Jan 31)
- Replies: 10
- Views: 13555
- Sun Jan 28, 2024 3:47 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Pluto in True Color (2024 Jan 28)
- Replies: 6
- Views: 1803
Re: APOD: Pluto in True Color (2024 Jan 28)
One way to tell which colors are more like what we would see is to actually look at the objects—through a telescope. To my eyes, Jupiter looks pale beige with brown stripes, and Neptune looks pale cyan. I have not yet observed Pluto (and even when I do, it will probably be to faint to discern color)...
- Mon Dec 18, 2023 1:25 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: What did you see in the sky tonight?
- Replies: 1303
- Views: 1103367
- Thu Dec 14, 2023 11:07 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: What did you see in the sky tonight?
- Replies: 1303
- Views: 1103367
Re: What did you see in the sky tonight?
I saw meteors last light, lots of meteors. This was easily the most prolific meteor shower I’ve ever seen, with more than one per minute. I also caught quite a few DSOs with my binocular: M31, M35, M41, M42, M43, M44, M45, M103, NGC 654, NGC 663, the Double Cluster, and NGC 1973-5-7. I believe I cau...
- Fri Sep 15, 2023 2:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 7331 and Beyond (2023 Sep 14)
- Replies: 21
- Views: 4138
Re: APOD: NGC 7331 and Beyond (2023 Sep 14)
Not if you use a star diagonal.Chris Peterson wrote: ↑Thu Sep 14, 2023 9:30 pmActually, it would be Teel.
- Thu Sep 14, 2023 8:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 7331 and Beyond (2023 Sep 14)
- Replies: 21
- Views: 4138
Re: APOD: NGC 7331 and Beyond (2023 Sep 14)
I wonder if anyone has dubbed this the Leet Galaxy.