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Mars, like Earth, may be experiencing climate change.
Did Pluto deserve to be demoted from the rank of planet in the solar system?
From giant storms and icy geysers to tilted orbits and weird spins, Neptune and its moons have many surprising features.
Astronomers have obtained hints of a dusty asteroid belt around a nearby star.
NASA unveiled its plans for establishing a base on the moon by the year 2024.
A dwarf planet at the fringes of the solar system finally gets an official name.
Astronomers spot an unusual object orbiting a nearby star.
A new definition would raise the number of planets in the solar system from 9 to 12.
Saturn's giant moon Titan appears to be sprinkled with lakes of liquid methane.
Astronomers are getting a close look at a comet that's falling apart as it nears the sun.
Orbiting beyond Pluto, the recently discovered 10th planet reflects a lot of light.
Saturn's mysterious moon Enceladus may have liquid water close enough to its surface to produce giant geysers.