Which two planets can support life?

The below sums up some worlds that we've discovered that, scientists believe, may contain alien life and which we could inhabit. 1) Kepler 186f. Kepler 186f Via NASA/JPL-Caltech/T. ... 2) Kepler 283c. Kepler 283c via Joachim Michaelis. ... 3 & 4) Gliese 667C f AND 667C e. ... 5 & 6) Kepler 62e AND Kepler 62f. ... 7) Gliese 581d.

futurism.com - Meet the 7 Alien Planets Most Likely to Have Life - Futurism

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Do you really know who the “One” is? Your true Soulmate?

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Our universe is a terribly large place. It extends some 92 to 93 billion light-years end to end. And the kicker? This is just the observable universe. Ultimately, there is a grand portion of the cosmos that we can't see. The universe is so young that light from this distant region of space hasn't had time to reach us yet, and because the universe is expanding at faster than the speed of light, we will never be able to see (or reach) this portion of the universe.

But what we can see of the cosmos is rather populated.

Conservative estimates assert that the observable universe may contain as many as 5,300,000,000,000 habitable worlds—that's 5.3 trillion planets that might contain life. Of course, not all of these necessarily have the ability to contain life "as we know it," but they may harbor life "as we don't know it." Generally speaking, in order to be considered a candidate for Earth-like life, the planet must be in the habitable zone of its star, terrestrial (i.e., not a gas giant), and within the acceptable size for life to form (generally, 0.5-2 times the mass of the Earth). As a refresher, the habitable zone is the area surrounding a planet where liquid water can theoretically exist. That said, there are a number of worlds that may contain extremeophiles and other forms of exotic organisms. The below sums up some worlds that we've discovered that, scientists believe, may contain alien life and which we could inhabit.

1) Kepler 186f

Kepler 186f Via NASA/JPL-Caltech/T. Pyle

One of the most likely candidates for life as we know it is Kepler 186f. In fact, this is a planet that (if we could get there) we might be able to colonize with relative ease. Sadly, the world is 490 light-years away, so it would take us hundreds of thousands of years to reach (even using very liberal and generous estimates). The planet was discovered back in April of 2014, just about a year ago. This falls well into the category of potentially Earth-like planets, as it is within the habitable zone of its star, is terrestrial, and is just 10% larger than Earth. Ultimately, Kepler 186f is just the outermost of the 5 known planets in the Kepler-186 system. Kepler 186 is a red dwarf star, which means that it is considerably smaller and dimmer than our own sun (more than 70% of the Milky Way's 100 billion or so stars are red dwarfs). The Planetary Habitability Laboratory created an excellent comparison of a Caribbean sunset as it appears on Earth and how a similar spot might look if it were on Kepler-186f at dusk (note the similarity in the size of the stars. This is because, despite the fact that Kepler 186 is considerably smaller, the planet is closer).

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Artists rendition of what a Kepler sunset might look like compared to Earth. Via University of Puerto Rico Arecibo.

2) Kepler 283c

Kepler 283c via Joachim Michaelis

Kepler 283c was discovered along with a host of other worlds as part of an enormous data dump from the Kepler Space Telescope. This data contained a staggering 700 newly confirmed exoplanets (keep in mind, just 20 years ago, we didn't know of any planets in other solar systems, so 700 in one go is quite staggering). However, this world is on the border of being able to support Earth-like life. It is about twice the size of Earth and orbits much closer to its home star, which is over 1,700 light years from Earth. But again, due to the decreased size in the star, it is still well within the bounds of Kepler 283's habitable zone.

3 & 4) Gliese 667C f AND 667C e

Gliese planets via University of Puerto Rico Arecibo

Personally, if we were going to try and make our way to any planet that might be habitable, I think I would make an argument for either Gliese 667C f or Gliese 667C e. That's because these woulds would offer an amazing view. Whe? They have three suns. Because this is a triple star system, these are two of the strangest potentially habitable worlds that we've ever discovered. Like the other worlds covered, both planets fall inside their star(s) habitable zone, and at just 22.1 light-years away, it would still take some time to get there, but the travel would be a (tiny) bit more manageable.

5 & 6) Kepler 62e AND Kepler 62f

Kepler 62 planets via University of Puerto Rico Arecibo

As their names suggest, these Kepler-62 planets are some other worlds that were discovered by NASA's Kepler Space Telescope. These planets would give us a little more room to work with, as 62e is about 1.6 times more massive than Earth and 62f is just about 1.4 times as massive. These worlds are quite out there (at least as far as our ability to travel goes). They wander though space about 1,200 light-years from Earth in the constellation Lyra. And if you were born on 62e, you would be quite a bit older than you are now. It completes one lap around its parent star, which is a red dwarf, every 122 days. 67f has an orbit of some 267 Earth-days. Researchers think that both 62e and 62f, are "water worlds" — warm places mostly or completely covered by liquid water. So they would also be absolutely awesome to visit (imagine how big the whales may be here), but living there long term might be a bit difficult.

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7) Gliese 581d

Artist's rendition of what it could look like on Gliese 581d. By DarinK/deviantART/CC License Gliese 581d is another one of our galactic neighbors (in the grand scheme of things, it is basically just around the corner). This world is just 20 light-years away (the closest planet covered on this list). However, despite its close proximity and its location in its star's habitable zone (alas) the planet might have a thick carbon dioxide atmosphere. This would make it rather inhospitable, as we need to breath oxygen (obviously). However, scientists also believe it could be rocky with liquid water. So although it might not be too grand for us, scientists think that it could harbor stunning rainforests. But even if it does have oxygen, humans would find it a little difficult to thrive there, as it is some seven times more massive than Earth and about twice its size. Still, since it is essentially in Earth's backyard, we might want to make a go at it anyways (if we ever get the tech to utilize interstellar travel).

futurism.com - Meet the 7 Alien Planets Most Likely to Have Life - Futurism

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