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Post by jandl100 on Dec 18, 2019 6:53:35 GMT
I think there is a lot of basic physics that we are totally clueless about, and some of the stuff we do know is merely an approximation that appears to 'fit' in the limited regimes where we have studied them. You may have seen recent news about the disparity in Hubble's constant [the rate of universal expansion] depending on which data sets you look at. That is very statistically significant and basically shows that there is something very wrong with our understanding of what the hell is going on! We are likely missing at least one very large piece of physics, imo. astronomynow.com/2019/04/27/hubble-constant-mismatch-no-fluke-new-physics-may-be-needed/External influence, as you suggest. Multiple interacting universes? Who knows! |
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Post by MartinT on Dec 18, 2019 7:19:53 GMT
Informative article, thanks.
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Post by jandl100 on Dec 19, 2019 8:22:33 GMT
Wow - the 1st test drive of the Mars 2020 rover
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Post by MartinT on Dec 19, 2019 8:48:14 GMT
Careful with that speed now, boys!
I wonder what it cost?
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Post by jandl100 on Dec 19, 2019 8:58:42 GMT
None of the rovers are likely to get a speeding ticket -- just take it v-e-r-y carefully, it's a long way for the nearest mechanic to come to do repairs!
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Post by jandl100 on Dec 19, 2019 9:01:12 GMT
... about $2.5 billion, I think.
Still, better than spending it on more weapons.
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Post by jandl100 on Dec 24, 2019 20:32:44 GMT
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Post by jandl100 on Dec 24, 2019 20:43:23 GMT
My goodness, what a stunning galaxy.  NGC 1398 lies in the constellation of the Furnace (Fornax) - It's a little bigger than the Milky Way at 130,000 light years across and is about 65 million light years away meaning the light we see today left this galaxy when dinosaurs were disappearing from the Earth. . Spiral galaxy NGC 1398 not only has a ring of stars, gas and dust but even a bar of stars and gas across its center, and spiral arms that appear like ribbons farther out. . This image was taken from ESO's Very Large Telescope in Chile. |
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Post by jandl100 on Dec 25, 2019 8:10:18 GMT
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Post by brian2957 on Dec 25, 2019 11:52:28 GMT
Stunning pictures as ever Jerry . I find the last one quite eerie in an ' earthly ' kind of way .
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Post by jandl100 on Dec 26, 2019 10:58:10 GMT
Choosing places for the OSIRIS-REx probe to touch down on Asteroid Bennu
-- and a rather amazing animation of the asteroid as well!
Where is the best place to collect a surface sample from asteroid Bennu?
Launched in 2016, NASA sent the robotic Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) to investigate the 500-meter-across asteroid 101955 Bennu.
After mapping the near-Earth asteroid's dark surface, OSIRIS-REx will next touch Bennu's surface in 2020 August to collect a surface sample. The featured 23-second time-lapse video shows four candidate locations for the touch, from which NASA chose just one earlier this month.
NASA chose the Nightingale near Bennu's northern hemisphere as the primary touch-down spot because of its relative flatness, lack of boulders, and apparent abundance of fine-grained sand. Location Osprey is the backup. NASA plans to return soil samples for Bennu to Earth in 2023 for a detailed analysis.
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Post by MartinT on Dec 26, 2019 21:45:48 GMT
Is TON-618 the largest black hole in the universe?
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Post by jandl100 on Dec 27, 2019 6:42:40 GMT
Mind boggling.
... and yet TON-618 is tiny compared to a galaxy, not only its linear size which is an insignificantly small % of the diameter of any galaxy, 2 trillionths of a % of the diameter of our galaxy, I think, but also not that huge in terms of mass. If I haven't dropped any zeros, even TON-618 is only 4.4 % of the total mass [including 'dark matter'] of our Milky Way galaxy - but something like half the mass of all the stars in the MW. Nonetheless, beyond imagining for a single object, if the term has any meaning for what is happening within a black hole's event horizon.
... which made me wonder what does go on inside a black hole's event horizon?
Interesting non-technical article here - www.skyandtelescope.com/astronomy-resources/whats-inside-a-black-hole/
Which says we don't really know.
Whoosh, here you go .... 
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Post by MikeMusic on Dec 27, 2019 15:49:45 GMT
More questions than answers, then more questions
Thanks Jerry
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Post by jandl100 on Dec 27, 2019 16:15:40 GMT
ALWAYS more questions. 😁
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Post by MikeMusic on Dec 27, 2019 16:23:10 GMT
You are my astronomy boggler  In the nicest possible sense of course |
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Post by MartinT on Dec 27, 2019 16:24:01 GMT
That's science: questions and ever evolving theories. No certainties.
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Post by MikeMusic on Dec 27, 2019 17:27:11 GMT
And in 50 years time half of it will all be proved wrong
If only we knew which half
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Post by jandl100 on Jan 2, 2020 6:32:32 GMT
an interesting perspective  |
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Post by jandl100 on Jan 2, 2020 6:53:45 GMT
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