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Re: Science Tidbits #5

Posted: Mon Jan 06, 2020 4:05 pm
by Lupine
^ :lol:
But that's only if it came from Mars.

Re: Science Tidbits #5

Posted: Mon Jan 06, 2020 11:49 pm
by RJDiogenes
huggle wrote:
Mon Jan 06, 2020 10:02 am
Image
Oh, I love his sweater!

Re: Science Tidbits #5

Posted: Tue Jan 07, 2020 3:08 pm
by Lupine
NASA has found Earth 2!*







*Meaning it's 20% larger and a bit of a sun-grazer. :contract:

Re: Science Tidbits #5

Posted: Tue Jan 07, 2020 11:38 pm
by RJDiogenes
I saw this on CNN today, but this article is more detailed. I was thinking that this is about the tenth time they've found the first Earth-like planet, but they're talking specifically about TESS. :lol:

But this looks really promising, although the stats raise a lot of questions. If it receives 86% of the solar energy that Earth receives, that implies that it's kind of chilly-- but if the star is a Red Dwarf then that energy is probably more weighted toward the infra-red, which may compensate. I also wonder what the apparent diameter of the star and the other two planets are from the surface. It sounds like the mini-Neptune would cause a solar eclipse every month or so. I also wonder how the proximity of a gas giant would effect the tidal locking. The place would have a very interesting sky, in any case.

Re: Science Tidbits #5

Posted: Tue Jan 07, 2020 11:51 pm
by scottydog
^ Plus, doesn't one side of this planet always face the sun? That side might be too hot and the other perpetually dark side might be too cold. I can imagine people living in the Goldilocks zone near the edge of the dark side.

Re: Science Tidbits #5

Posted: Wed Jan 08, 2020 11:10 pm
by RJDiogenes
It's hard to tell how the tidal locking would affect the environment. The only tidally locked world we know about it Venus, and that has a runaway greenhouse effect. An Earth-like world with a transparent atmosphere and massive oceans may be better able to distribute the heat, although it would likely have monstrous winds. But that's why I wonder about the gas giant in the middle orbit. Given the great disparity in their masses and the frequent conjunctions, the giant's gravity may keep the planet spinning.

Re: Science Tidbits #5

Posted: Wed Jan 08, 2020 11:37 pm
by Lupine
Actually Venus isn't tidally locked, but it's rotation is very slow. Whether that has anything to due with its current condition is an open question.

Re: Science Tidbits #5

Posted: Thu Jan 09, 2020 11:36 pm
by RJDiogenes
Now it's not tidally locked? First Mercury was locked and Venus wasn't, and then it was the other way around. I just can't keep up. :lol:

I'd love to know if either the slow rotation (or tidal lock) or the lack of a satellite has anything to do with runaway greenhouse effect.

Re: Science Tidbits #5

Posted: Fri Jan 10, 2020 4:02 pm
by Lupine
It's actually rather hard to study planets closer to the sun than us. Venus especially since it's covered in clouds. The slow rotation and lack of a moon might play a role in it's current state. Personally I've wondered if it got hit by something big in the past, altering it's rotation.

Re: Science Tidbits #5

Posted: Sat Jan 11, 2020 12:15 am
by RJDiogenes
Could be. That happened to us, so it could have happened to Venus, too, only with the opposite result.

Re: Science Tidbits #5

Posted: Sat Jan 11, 2020 11:49 pm
by scottydog
Doesn't having a nearby gas giant come in handy for steering comets and asteroids away? I think I heard somewhere that Jupiter serves this function for us.

Re: Science Tidbits #5

Posted: Sun Jan 12, 2020 3:59 pm
by Lupine
^Yeah that's one of the theories out there, along with it steering comets here to give us water. Sometimes both theories are lumped together. But I refer to those as "Miracle Theories"- IE, "We wouldn't be here except for (fill in the blank)".
The Jeans-Jefferys hypothesis was a variation of a Miracle Theory as was the notion that only singular stars (like the Sun, thus rare) could have planets.

Re: Science Tidbits #5

Posted: Sun Jan 12, 2020 10:19 pm
by RJDiogenes
Yeah, I find the Mediocrity Principle much more believable than Miracle Theories. I don't really buy into any theory that has Jupiter contributing heavily to life on Earth. I think there's a much more basic set of elements involved.

Re: Science Tidbits #5

Posted: Sun Jan 12, 2020 11:00 pm
by Lupine
And in the case of exo-planets the Mediocrity Principle has been borne out.

Re: Science Tidbits #5

Posted: Mon Jan 13, 2020 11:12 pm
by RJDiogenes
Yup, wherever dirtballs can clump together, they will. :lol:

Re: Science Tidbits #5

Posted: Tue Jan 14, 2020 3:58 pm
by Lupine
And ironically we have another article that takes a hot at Jupiter.

Re: Science Tidbits #5

Posted: Wed Jan 15, 2020 12:03 am
by RJDiogenes
That's interesting, because I never knew there was such a demarcation and that the outer system was more rich in organics-- kind of ironic, since all the organic beings that we know of are down here. I wonder how, or if, things would be different if the inner system had also been rich in organics. Would life on Earth have evolved more quickly or more robustly? Would life have had a better chance on Mars or Venus, and shaped their environments differently? Very interesting.

Re: Science Tidbits #5

Posted: Wed Jan 15, 2020 11:22 pm
by Lupine
Apparently a second planet has been found orbit Proxima Centauri (they think)
However it does not look like a vacation spot. :cold:

Re: Science Tidbits #5

Posted: Wed Jan 15, 2020 11:41 pm
by RJDiogenes
^^ That link is dead, but it's even dead when I find it on Google, so they must have removed the page for some reason. Maybe the denizens of Proxima C don't want to be found! :afraid:

Anyway, I did see it on CNN today. The headline said "Earthlike," but it didn't sound very Earthlike to me, although I can see that it has the potential to be life bearing. It's very interesting that both of Proxima's planets could have life of some kind. Makes for a very tempting target.

Re: Science Tidbits #5

Posted: Wed Jan 15, 2020 11:46 pm
by Lupine
Odd, because I just clicked the link and it worked. :conf:

Re: Science Tidbits #5

Posted: Thu Jan 16, 2020 1:57 am
by RJDiogenes
Hmm. You don't get a page that says, "Houston, We've Had A Problem?" I just got it again. :unsure:

Re: Science Tidbits #5

Posted: Thu Jan 16, 2020 11:46 pm
by Lupine
Now I do. :conf:

Re: Science Tidbits #5

Posted: Fri Jan 17, 2020 12:22 am
by RJDiogenes
You might have had the original page stored in your cache before.

Re: Science Tidbits #5

Posted: Sat Jan 18, 2020 9:47 am
by huggle
For me the link works and as it's the first time I went to that site, it can't have been cached. I suspect a tidal phenomenon ;)

Re: Science Tidbits #5

Posted: Sat Jan 18, 2020 4:25 pm
by Lupine
Or history has been altered. :clock: :unsure: