A recently detected planet light-years from Earth, Keplerf , is close to Earth's size and is located in its solar system's habitable zone. Any water present on a planet orbiting here can remain liquid, given the right atmospheric pressure. Planets in the box have the right atmospheric pressure and the right temperature to keep surface water in a liquid state.
In our solar system Earth and Mars are in the box, Venus and Mercury outside. The cold gas giants are literally off the chart.
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More Just In. Back to top. Footer ABC News homepage. But if we discover another, the answer jumps straight past two to infinity. The reason: You can posit a universe in which the confluence of factors that made life possible here are so complex that the right roll of the dice could statistically happen only once.
But if it can happen more than once, why should there be any limit? Actually, something could be so rare in nature that it happens only two or three times, but the overall zero-one-infinity idea originated with theologians debating atheism, monotheism and infinite polytheism, and planetary scientists just kind of liked it and claimed it as their own. And with the recent explosion in the discovery of exoplanets planets orbiting other stars , astronomers now believe that virtually every star in the Milky Way is circled by at least one planet.
There are up to billion stars in our galaxy and about billion other galaxies out there—trillions upon trillions of places life could be thriving. In their search for such worlds, astronomers focus their energy on Earth-like, rocky planets, with atmosphere, water and an orbit that places them in the so-called habitable zone, where temperatures are just right for the water to exist in liquid form.
Last week, NASA announced a jackpot : an Earth-sized world in the habitable zone of a hospitable star, just light years from here. TOI is a red dwarf, a class of stars smaller and cooler than our sun, which were at first thought of as poor candidates for nurturing life, due to their relatively low temperature.
But the fact is, as long as the planets orbit close enough to the hearth of the star, they get plenty of light and warmth—and TOI d does.
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