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Is Pluto Another Geyser World? "Shocking" Images Baffle Scientists

In addition to featureless plains, Pluto may even sport active geysers—with no recourse to tidal heating to power them.

Pluto Is Young

The New Horizons science team is stunned by surface features on Pluto and its large moon Charon that cannot be billions of years old.

Pluto Inbound Image Stuns Scientists

It's not a featureless orb: Pluto has a whale and a heart. A "complex and nuanced" surface shows that Pluto and its large moon Charon had a history.

Where Are the Earth's Impact Craters?

The number of impact craters on Earth is almost negligible compared to Mars and the moon. Can erosion explain this?

Will Pluto Surprise Scientists?

First-time encounters have a long history of shocking planetary scientists with unexpected features. It's about time for Pluto.

What to Look for at Pluto

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

Water Worlds Tempt with Life, Not Youth

More and more planets and moons are suspected of having liquid water, but what should be the logical implications?

Solar System Reversals

The planets keep going around, but theories about them often stop and go backward or sideways. When nothing else works, send in the impactors!

Of Planets and People

Here's a quick tour of the planets to see what's newsworthy.
Triton Neptune montage

Active Moon Triton Revisited

25 years ago today, Voyager 2 flew by Triton, a moon of Neptune, astonishing scientists with its active geology.

Keeping Titan Old

As the Cassini orbiter makes its 103rd close pass by Titan, have long-agers found ways to keep it billions of years old?

Every Planet Surprises Secular Astronomers, II: Outer Planets

"Surprise" or "puzzling" are the most common words in news reports about bodies in the solar system. Here are recent examples that discuss the outer planets.

Two Solar System Surprises

Sometimes we learn more from surprises than predictions.

Scientists Dodge Youthfulness of Saturn Moon Titan

Like Enceladus, Saturn's moon Titan shows multiple signs of being far less than 4.5 billion years old – yet the press releases are strangely silent about the implications.

Astronomers Wrestle with "Endless Mysteries"

Some of the biggest questions in the universe remain completely baffling to astronomers, a leading journal admitted.
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