Whitley Strieber's Unknown Country
Another Earth?
26-Jan-2006
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Most of the planets we discover are huge, gaseous planets like Jupiter, because these are easy to see. However, we now know that a large outer planet may indicate that there is a habitable planet in the inner orbit of a solar system, because the large planet absorbs the blows from dangerous asteroids.
The new planet is five times the size of Earth and is unlikely to have life on it, because it's probably covered with frozen oceans. So why astronomers so excited? Because this discovery shows that it's possible to spot Earth-like planets around distant suns, meaning the day may not be too far off when we will discover alien life.
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