habitable zone


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habitable zone

the area around a star (such as the sun) in which there is sufficient energy present to sustain life.
References in periodicals archive ?
"Our Sun isn't done aging, and as it grows older, it grows brighter, with the habitable zone steadily and inexorable moving outward," Stutter wrote.
By providing specific constraints on when precisely giant planets become "bad neighbors," Georgakarakos, Eggl, and Ian Dobbs-Dixon, NYUAD assistant professor of physics, were able to identify prime targets in the ongoing search for a "second Earth." "The general idea is the farther away the giant planet is from the habitable zone, the better.
Menou, an astrophysicist at the University of Toronto, ran climate simulations mimicking the conditions on hypothetical exoplanets just within the outer edge of the habitable zone. The planets receiving slightly less solar heat than Earth were vulnerable to extreme climate swings.
To be in the habitable zone, also known as the "Goldilocks zone", a planet must be not too hot or too cold and receive roughly as much sunlight as Earth.
The mere presence of a planet in its parent star's habitable zone does not mean that it invariably is hosting living creatures.
Since its launch in 2009, Kepler has confirmed 961 planets, but only a few dozen are in the habitable zone. Most are giant gas balls like Jupiter and Saturn, and not ideal places for life.
The four new habitable zone planets are all at least twice as big as Earth so that makes them more likely to be gas planets instead of rocky ones like Earth -- and less likely to harbor life.
Ten newly discovered planets are close to Earth-sized and in the habitable zone of their stars, meaning they orbit at a distance that is not too hot, or too cold to support life, Kepler scientists told reporters.
Colleague Erik Perigura, from the University of California at Berkeley (UC Berkeley), said: "What this means is, when you look up at the thousands of stars in the night sky, the nearest sun-like star with an Earth-size planet in its habitable zone is probably only 12 light years away and can be seen with the naked eye.
It was orbiting its own sun, in a "habitable zone," nicknamed the "Goldilocks zone," meaning its temperatures are suitable for liquid water, and possibly life.
A pair of so-called "super-Earths" have been detected within the "habitable zone" of the star, the orbital region where temperatures are just warm enough to allow bodies of surface water such as oceans and lakes.
NASA's Kepler mission has discovered its first Earth-size planet candidates and its first candidates in the habitable zone, a region where liquid water could exist on a planet's surface.