It was almost 100 years ago that Clyde W. Tombaugh discovered Pluto. That was the last planet found until 1992, when humans found another one. But this new planet wasn't in our solar system—it was ...
Of all known planets, Earth is as friendly to life as any planet could possibly be—or is it? If Jupiter's orbit changes, a new study shows Earth could be more hospitable than it is today.
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