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Mark Showalter

Planetary astronomer Mark Showalter tells the story of when he became the first human to ever set eyes on Saturn's strange moon Pan in 1990.

Mark Showalter

Mark Showalter explains how determining basic information about Pluto's small moons—Kerberos and Styx—is more complicated than initially thought.

Mark Showalter

When New Horizons flies past Pluto in July, we will see a new, alien landscape in stark detail. At that point, we will have a lot to talk about. The only way we can talk about it is if those features, whatever they turn out to be, have names.