National security warrants NASA background checks, judge says.
Two months after surviving a giant dust storm, one of NASA's martian rovers begins a risky drive into Victoria Crater.
Scientists believe heat from radioactive decay inside a tiny, icy Saturn moon shortly after it formed billions of years ago may explain why geysers are erupting from the surface today.
LOS ANGELES (AP) -- The astronomers who claim to have discovered the 10th planet in the solar system have another intriguing announcement: It has a moon
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