Search found 1568 matches
- Thu Jun 24, 2021 1:45 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: 2014 UN271
- Replies: 20
- Views: 7645
Re: 2014 UN271
Sun-Earth LaGrange L2 is a LONG way from Saturn's orbit, eve when it is outwards. Is that realistic, neufer?
- Thu Jun 24, 2021 12:40 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: 2014 UN271
- Replies: 20
- Views: 7645
Re: 2014 UN271
Thanks, Chris. Nasa's Dragonfly mission will land a flying rover on Titan in 2036. By then, UN271 will be halfway to the orbital distance of Neptune, and well out of the ecliptic. Would you think that anything could be 'piggy-backed' onto the Dragonfly carrier that could be sent towards the comet? J...
- Thu Jun 24, 2021 10:16 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: 2014 UN271
- Replies: 20
- Views: 7645
Re: 2014 UN271
Just been back to the Nasa page and fiddled with the controls to look from the Ecliptic. That shows that the orbit of 2014 UN271 is almost at right angles to that plane, so it comes from way, way outside! Has the orbit been observed for long enough to tell if it is one of the Sun's children or anoth...
- Wed Jun 23, 2021 9:57 am
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: 2014 UN271
- Replies: 20
- Views: 7645
2014 UN271
I got excited when I read a short piece from New Scientist about this "huge and previously unknown object entering our solar system that will reach the orbit of Saturn in 2031"! Wanting to know more, I searched and found this from Nasa: https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=54161348;orb=1...
- Tue Jun 22, 2021 2:37 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: HD 163296: Jet from a Star in Formation (2021 Jun 22)
- Replies: 16
- Views: 19541
Re: APOD: HD 163296: Jet from a Star in Formation (2021 Jun 22)
Further, in answer to Shaleshs, stellar jets may be intermittent, and/or assymmetric.
See the Wiki entry: https://en.wikipedia.org/wiki/Astrophys ... 87_jet.jpg
And this Hubble pic: http://www.eg.bucknell.edu/~mead/HomePa ... Disk3.html
John
See the Wiki entry: https://en.wikipedia.org/wiki/Astrophys ... 87_jet.jpg
And this Hubble pic: http://www.eg.bucknell.edu/~mead/HomePa ... Disk3.html
John
- Tue Jun 22, 2021 8:35 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Ganymede from Juno (2021 Jun 14)
- Replies: 29
- Views: 15152
Re: APOD: Ganymede from Juno (2021 Jun 14)
What ever happened to "craterchains", the apocalyptic contributor who argued they were evidence of prehistoric interplanetary warfare?
He would have loved this!
He would have loved this!
- Tue Jun 22, 2021 8:27 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: HD 163296: Jet from a Star in Formation (2021 Jun 22)
- Replies: 16
- Views: 19541
Re: APOD: HD 163296: Jet from a Star in Formation (2021 Jun 22)
Tadpole, The gas giants of the Solar System may have developed much closer to the Sun than they are now, and we have evidence of extra solar gas giants that orbit as close, or closer, to their suns than the Earth. Some event caused the rearrangement of Solar orbits that we see today, so there is no ...
- Tue Jun 15, 2021 12:01 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Zhurong: New Rover on Mars (2021 Jun 15)
- Replies: 22
- Views: 9222
Re: APOD: Zhurong: New Rover on Mars (2021 Jun 15)
XgeoX, there are other designs for extraterrestrial wheels - for instance the wire mesh ones on the Apollo Lunar Rover: https://www.pinterest.co.uk/pin/64528207130752446/
JOhn
JOhn
- Tue Jun 15, 2021 8:25 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Zhurong: New Rover on Mars (2021 Jun 15)
- Replies: 22
- Views: 9222
Re: APOD: Zhurong: New Rover on Mars (2021 Jun 15)
It's interesting that the shape of a Mars Rover seems to converge, whoever the designers!
I presume that's a thermonuclear power generator at the back, like Curiosity's?
And the wheels are very similar. 'Borrowed' ideas maybe, but they decided on the same design.
I presume that's a thermonuclear power generator at the back, like Curiosity's?
And the wheels are very similar. 'Borrowed' ideas maybe, but they decided on the same design.
- Mon Jun 14, 2021 9:22 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Ganymede from Juno (2021 Jun 14)
- Replies: 29
- Views: 15152
Re: APOD: Ganymede from Juno (2021 Jun 14)
AHEM! "no known geological mechanism"??? Chris, see: https://www.theguardian.com/environment/2019/aug/25/massive-pumice-raft-spotted-in-the-pacific-could-help-replenish-great-barrier-reef Underwater eruptions produce pumice, lava so full of gas that when solidified, it floats. How long it...
- Mon Jun 14, 2021 9:06 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Ganymede from Juno (2021 Jun 14)
- Replies: 29
- Views: 15152
Re: APOD: Ganymede from Juno (2021 Jun 14)
AHEM! "no known geological mechanism"??? Chris, see: https://www.theguardian.com/environment/2019/aug/25/massive-pumice-raft-spotted-in-the-pacific-could-help-replenish-great-barrier-reef Underwater eruptions produce pumice, lava so full of gas that when solidified, it floats. How long it ...
- Wed Jun 09, 2021 4:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
- Replies: 18
- Views: 4627
Re: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
"wHimsy", neufer, wiv an 'H', and no 'e'! And the Lord Peter, however much Sayers gave him the manners and appearance of an upper-class 'silly ass' (a donkey-type ass!), or how he has been portrayed by actors, has the incisive, intelligent and dare I say, scientific mind, that made him a t...
- Wed Jun 09, 2021 1:49 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
- Replies: 18
- Views: 4627
Re: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
Light-hearted? "When I hear the word 'Culture' I reach for my revolver!"
The beauty of science is overwhelming - there is no need to embellish and decorate it with whimsy!
The beauty of science is overwhelming - there is no need to embellish and decorate it with whimsy!
- Wed Jun 09, 2021 10:13 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
- Replies: 18
- Views: 4627
Re: APOD: A Total Lunar Eclipse Corona (2021 Jun 09)
Apod, are you purposely trying to be annoying, after our criticism of your 'Face on Jupiter' pic, yesterday? A 'Flower' moon? The moon has no flora, never has, never will. A 'Super' moon? That does NOT "appear a bit larger and brighter than the average full moon" - it is 7% wider than an a...
- Tue Jun 08, 2021 10:52 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Face in the Clouds of Jupiter from... (2021 Jun 08)
- Replies: 20
- Views: 7009
Re: APOD: A Face in the Clouds of Jupiter from... (2021 Jun 08)
I agree with Ann! If Apods aren't greeted with sighs of aesthetic delight, they get geven a name. Anything "mcanyface" is so lame and hackneyed that you should be ashamed of yourselves. This picture adds NOTHING to scientific knowledge!
John
John
- Sun Jun 06, 2021 5:55 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
- Replies: 29
- Views: 8115
Re: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
Of course, stellar systems are mainly empty space, too! An alien spacecraft visiting the Sun would have to conduct a very careful survey to determine that we had any planets, and finding the terrestrial ones wouldn't be easy. (The paper estimates 50 interstellar objects inside a 50 AU radius sphere...
- Sat Jun 05, 2021 9:56 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
- Replies: 29
- Views: 8115
Re: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
Of course, stellar systems are mainly empty space, too! An alien spacecraft visiting the Sun would have to conduct a very careful survey to determine that we had any planets, and finding the terrestrial ones wouldn't be easy. (The paper estimates 50 interstellar objects inside a 50 AU radius sphere...
- Fri Jun 04, 2021 1:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
- Replies: 29
- Views: 8115
Re: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
"Flying blindly through the Galaxy" Like Oumuamua, the first extrasolar object detected. But we may already have another one, 2I/Borisov (https://www.nature.com/articles/d41586-019-03530-3 ) and there could be as many as 50 interstellar objects within the Earths orbit ( https://link.spring...
- Fri Jun 04, 2021 10:32 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
- Replies: 29
- Views: 8115
Re: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
Thank you, Chris, for the words about "sterile" globular clusters - "learn something every day" - Aristotle? For Orin, I looked for online animations of the movement of a cluster, but many seem to show an axial rotation, or else what they show is a simulated 'fly-by' of a relativ...
- Thu Jun 03, 2021 9:24 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
- Replies: 29
- Views: 8115
Re: APOD: Millions of Stars in Omega Centauri (2021 Jun 03)
Thank you Ann, always interesting! And stars 0.1LY apart, on average? You don't tell us what the SD is, but that sounds awful close, even if it is 6^11miles (10^11kilometers)! If there are planets around those stars,and there must be, and there is life on those planets, as there may be, or has been,...
- Wed Jun 02, 2021 11:37 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Galactic Center in Stars, Gas,... (2021 Jun 02)
- Replies: 14
- Views: 7642
Re: APOD: The Galactic Center in Stars, Gas,... (2021 Jun 02)
Quote this APOD description, "Galactic beasts such as expanding supernova remnants, hot winds from newly formed stars, unusually strong and colliding magnetic fields, and a central supermassive black hole are all battling in a space only 1000 light years across." I've asked this before, an...
- Mon May 24, 2021 12:56 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Lightning Eclipse from the Planet of... (2021 May 24)
- Replies: 11
- Views: 2553
Re: APOD: Lightning Eclipse from the Planet of... (2021 May 24)
Chris,
Then I misunderstand the chart from the UK Hydrographic Office!
Appears to show a partial eclipse east of the Californian coast and west of Java. What do the contours mean, then?
Totally misses Europe, of course!
John
Then I misunderstand the chart from the UK Hydrographic Office!
Appears to show a partial eclipse east of the Californian coast and west of Java. What do the contours mean, then?
Totally misses Europe, of course!
John
- Mon May 24, 2021 9:45 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Lightning Eclipse from the Planet of... (2021 May 24)
- Replies: 11
- Views: 2553
Re: APOD: Lightning Eclipse from the Planet of... (2021 May 24)
Ummmmmmmmmm? " The next total lunar eclipse will occur on Wednesday"?
Total only over most of the Pacific, Australia and New Zealand!
http://astro.ukho.gov.uk/eclipse/1112021/L2021May26.pdf
JOhn
Total only over most of the Pacific, Australia and New Zealand!
http://astro.ukho.gov.uk/eclipse/1112021/L2021May26.pdf
JOhn
- Sun May 23, 2021 10:21 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Markarian's Chain (2021 May 22)
- Replies: 24
- Views: 5334
Re: APOD: Markarian's Chain (2021 May 22)
Thank you for your seminar, Ann! I am that tiny bit wiser!
- Sat May 22, 2021 9:37 am
- Forum: The Communications Center: Breaking Science News
- Topic: HEAPOW: A Ground-breaking Mirror in Space (2019 Sep 30)
- Replies: 3
- Views: 2045
Re: HEAPOW: A Ground-breaking Mirror in Space (2019 Sep 30)
Every British schoolboy is, or used to be, familiar with the story of the Dam Busters, 617 Squadron of WW2, that used Prof.Barnes Wallace's work to 'skip' bombs over torpedo nets and onto the inner wall of several dams, catastrophically breaching them. The "Bouncing Bombs" were cylinders a...