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Earthrise 2015 LRO

Your Mind Can Space Out, But Your Body Belongs on Earth

Through the imagination, we can soar through distant galaxies. Sooner or later, physical reality hits home.

How Long Can Comets Bust Up and Re-form?

If comets repeatedly break up and re-coagulate, how long could that recur?

Hot Jupiters: Astronomers Blew It

The experts were (and are) wrong about how planets form, new data from a weird exoplanet show.

Pluto May Be Erupting

Two mountains that look like giant volcanoes hint at current activity on Pluto.

What to Look for at Pluto

As New Horizons closes in on Pluto for its July 14 encounter, what questions should be asked?

Orbital Ice Age Theory Melts

Orbital cycles do not cause ice ages, a new study suggests. Instead, the whole world experienced an ice age at the same time.

First Rosetta Science Results Are Surprising

The first suite of science papers from the Rosetta mission has been published, giving new insights about comets.