BBC News - Kepler 22-b: Earth-like planet confirmed
Astronomers have confirmed the existence of an Earth-like planet in the "habitable zone" around a star not unlike our own.
The planet, Kepler 22-b, lies about 600 light-years away and is about 2.4 times the size of Earth, and has a temperature of about 22C.
It is the closest confirmed planet yet to one like ours - an "Earth 2.0".
However, the team does not yet know if Kepler 22-b is made mostly of rock, gas or liquid...
...
Kepler 22-b lies at a distance from its sun about 15% less than the distance from the Earth to the Sun, and its year takes about 290 days. However, its sun puts out about 25% less light, keeping the planet at its balmy temperature that would support the existence of liquid water. [Via H. Miller]
What Is the Average Temperature of Earth? | eHow.com
When scientists measure the average temperature of the Earth, they take many readings from the coldest and hottest places before calculating a mean temperature, generally agreed to be 15 degrees C, or 59 degrees F.
Posts
No comments:
Post a Comment