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Re: Astronomy News


we have it

Some of Pluto's surface, a good picture of the big moon Charon and - unfortunately - still the best picture yet we have of Hydra, one of the small moons.

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Jul/16/2015, 14:43 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]really old galaxy

Looking further than ever - to the past.

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Dec/4/2015, 20:45 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]We Finally Have the Full Story on Ceres' Mysterious Bright Spots

quote:

Now, in the most detailed surface analysis to date, a study led by Andreas Nathues of the Max Planck Institute in Germany argues that the mystery spots are actually a little bit of both—mostly salt, some water ice. The combination of these two ingredients probably comes from a briny ice sheet located somewhere beneath Ceres’ surface, one that gets excavated during impacts. We also have much stronger evidence for afternoon haze over at least two of the bright spots—a phenomenon that’s been witnessed over comets, but never over a rocky, asteroid-like body.



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Dec/10/2015, 16:40 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


You may have heard of the "9th planet".
If the gravity math works as well as they say, I'm ready to believe it's out there.

I'll try to explain what we're dealing with.
There's certain logic - due Newtonian math/science I don't pretend to fully know - that each planet is typically about 1,5-1,8 times as far from Sun as the previous. By this logic we see that there should be a planet between Mars and Jupiter, we're is the asteroid belt.

Consider Mercury as being on Track 1. Venus, Earth, Mars Tracks 2-4. The asteroid belt (or alternatively just dwarf planet Ceres) on Track 5. Tracks 6-9: Jupiter, Saturn, Uranus and Neptune.
Track 10 is crowded: Pluto and fellow dwarf planets Haumea and Makemake are all three in the approximate distance where the next planetary object should be.
The last dwarf planet Eris is on Track 11.
(There are around dozen "dwarf planet candidates", objects that could be considered dwarf planets and are nearly as big as recognized ones, that are practically also on Tracks 10 and 11.)

This new "Planet 9" isn't on Track 12. Or 13. No, it's so far that by this logic it would be on Track 16.
Which also means there are 4 "Tracks" between Eris and P9; 4 areas where there's likely lots of material including one or more dwarf planets or even a small planet.
So if/when Planet 9 is proven real, it greatly increases probability of having several more dwarf planets (or even a planet or two) not yet found.

I should point out the "Track" theory becomes increasingly more inaccurate to further you go from Sun, as orbits of objects get more eccentric. So the logic is already very arguable at Tracks 10-11 and there's very little information about objects beyond that.

Being so far, even though it's assumed larger than Earth, P9 is hard to actually see. Pluto is 200 times brighter than it's potential replacement as ninth planet.

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Jan/21/2016, 18:20 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


Every now and then it slaps me in the face how little I know about even somewhat basic astronomical concepts.

Recently found Crater 2 has now awakened me to the matter of ]satellite galaxies of the Milky Way.
That's something you don't hear often, that we have dozens of small galaxies orbiting Milky Way. (Not all certainly orbiting, some may just be passing by, but nevertheless).

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Apr/19/2016, 16:23 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]New theory suspects Sun may have eaten a planet

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Apr/20/2016, 21:52 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]Aurora spotted on Jupiter

Ultraviolet in reality, but pretty nonetheless.

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Jul/1/2016, 1:13 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


I'm not sure what's the real status of 2015 RR245, which now appears in news as "new found/confirmed dwarf planet".

It may be that it has been observed better than several larger objects that have for years been candidates for new dwarf planets. But as far as I know, this is just another icy rock to a long list of potential dwarf planets.

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Jul/12/2016, 3:21 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]Io's atmosphere freezes to solid every time it's in Jupiter's shadow

(which is 2 hours every 1.7 days)

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Aug/3/2016, 19:44 Link to this post Send PM to Kaunisto
 
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Re: Astronomy News


]Europe's Rosetta Probe Finds Lost Philae Lander on Comet

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Sep/5/2016, 18:15 Link to this post Send PM to Kaunisto
 


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