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[Space] Found! Potentially Earth-Like Planet at Proxima Centauri Is Closest Ever - Page 4

post #31 of 100
Quote:
Originally Posted by Dienz View Post

In our galaxy, there is an estimated 200 to 400 billion stars. If just 1% of those had at least 1 planet, and just 1% of those planets were capable of supporting life as we know it and just 1% of that life was an intelligent race, that still leaves 200,000 to 400,000 potential alien civilizations; or at the very least Earth-like planets where life could exist.

Extraterrestrial life must exist. I personally find the thought that our planet is the only one with life on it totally absurd. How? With so many galaxies and so many stars and the potential for so many life-bearing worlds, how can ours be unique?

Edit: What I said is pretty much a direct quote but I can't remember who said it... I think Neil deGrasse Tyson. Regardless of who said it, it's a remarkable idea that there could possibly be that many alien civilizations or habitable planets.

Astronomers are quite familiar with those kinds of statistics. The real questions are as follows: how far away are they, and how technologically advanced are they?

The Milky Way is 100,000 light years in diameter, and stars are less concentrated the farther away from the center you get.

The Universe is about 14 billion years old. Most of the first stars are short lived giant stars, and it required the death of these stars to make all the elements. Planetary systems didn't start emerging until an estimated 10 billion years ago, with our Sun forming about 5 billion years ago. It may be the case that we are relatively early on the cosmic timescale.
Quote:
Originally Posted by aweir View Post

That's just speculation based on our observation. Maybe other life forms in the universe can live on compressed gases like liquid nitrogen, hydrogen or methane or might be silicon-based. What the scientist are concerned about is human habitable planets. Just because "we" can't live there doesn't mean other life forms can't.

Which leads me to the theory that we haven't been visited by aliens yet because they could not survive our toxic water and oxygen planet.

Speculate as much as you want. It doesn't mean anything until you can back it up with evidence.
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post #32 of 100
Quote:
Originally Posted by DNMock View Post

all of that is mentioned in the article linked btw.
Glad that it is. I didn't read that one because I saw a similar one earlier today, where these facts were omitted.

It's not totally impossible that a planet around a red dwarf could harbor a habitable zone, but it would require an absolutely perfect set of circumstances that are highly unlikely to exist at Proxima, because of that star's very high flare activity.

The best chance of finding anything in that system, if there are planets in the habitable zone, is probably at Alpha Centauri B. Alpha Centauri A is closer to the spectral type of the Sun, but it's also more massive and just as old, so it already has 1.5 times solar luminosity and this is increasing fairly quickly. Anything around AC-A where intelligent life could have evolved has probably already been turned into Venus. Project Longshot recognized that and was designed to go into orbit around AC-B.
     
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post #33 of 100
Quote:
Originally Posted by Tsumi View Post

Astronomers are quite familiar with those kinds of statistics. The real questions are as follows: how far away are they, and how technologically advanced are they?

The Milky Way is 100,000 light years in diameter, and stars are less concentrated the farther away from the center you get.

The Universe is about 14 billion years old. Most of the first stars are short lived giant stars, and it required the death of these stars to make all the elements. Planetary systems didn't start emerging until an estimated 10 billion years ago, with our Sun forming about 5 billion years ago. It may be the case that we are relatively early on the cosmic timescale.
Speculate as much as you want. It doesn't mean anything until you can back it up with evidence.

You're right, astronomers are familiar with these statistics but most people might not be; certainly not me beyond what I wrote. It's just mind boggling that even after you pare the numbers down to only a fraction of your starting estimate, the result is still enormous.
Edited by Dienz - 8/25/16 at 12:48pm
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post #34 of 100
Quote:
Originally Posted by jsc1973 View Post

Glad that it is. I didn't read that one because I saw a similar one earlier today, where these facts were omitted.

It's not totally impossible that a planet around a red dwarf could harbor a habitable zone, but it would require an absolutely perfect set of circumstances that are highly unlikely to exist at Proxima, because of that star's very high flare activity.

The best chance of finding anything in that system, if there are planets in the habitable zone, is probably at Alpha Centauri B. Alpha Centauri A is closer to the spectral type of the Sun, but it's also more massive and just as old, so it already has 1.5 times solar luminosity and this is increasing fairly quickly. Anything around AC-A where intelligent life could have evolved has probably already been turned into Venus. Project Longshot recognized that and was designed to go into orbit around AC-B.

yeah surprised me to see that put in there too, granted it's buried at the bottom of the article, but I figured it was worth mentioning. Gotta give them some credit for it.
post #35 of 100
Now if Star Citizen can ever be finished, I can at least "experience" this in some sort of more than just imagined way! Born way too early to ever experience any real space travel, but at least we have VR... thumb.gif
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post #36 of 100
Quote:
Originally Posted by Creator View Post

Now if Star Citizen can ever be finished, I can at least "experience" this in some sort of more than just imagined way! Born way too early to ever experience any real space travel, but at least we have VR... thumb.gif
Would you like an Occulus 2.0 and 2x Titan XP with that, the extra one's for dedicated PhysX?
post #37 of 100
Quote:
Originally Posted by mouacyk View Post

Would you like an Occulus 2.0 and 2x Titan XP with that, the extra one's for dedicated PhysX?

If star citizen doesn't support 4 way gpu's on release given that it's basically a $100+ million dollar tech demo for PC, I'll be very upset.
post #38 of 100
Quote:
Originally Posted by DNMock View Post

If star citizen doesn't support 4 way gpu's on release given that it's basically a $100+ million dollar tech demo for PC, I'll be very upset.

Given SC's development history, I wouldn't count on something so niche as 4-way support. But then again, I'm not exactly optimistic regarding SC in general.
Quote:
Originally Posted by Creator View Post

Now if Star Citizen can ever be finished, I can at least "experience" this in some sort of more than just imagined way! Born way too early to ever experience any real space travel, but at least we have VR... thumb.gif

Definitely not the same as SC (it's more of a planetarium than a game), but SpaceEngine might satisfy the 'explore space' itch for the time being. thumb.gif
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post #39 of 100
4.2 light years only? THAT'S IT?! L****T!
post #40 of 100
Quote:
Originally Posted by Creator View Post

Now if Star Citizen can ever be finished, :

Uhh.. We will have colonies on this planet before that happens biggrin.gif
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