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“Exploration is in our nature.” - Carl Sagan

Amir Alexander

Writer and Editor for planetary.org

Latest Articles

Solar system montage with eight planets

The Birth of the Modern Universe

Amir Alexander reviews Alan Hirshfeld's newest book,

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Stardust@home Finds Some Stardust

What’s new at Stardust@home, the groundbreaking program that asked volunteers to help find interstellar dust particles collected by the spacecraft Stardust.

Solar system montage with eight planets

On writing Infinitesimal

Amir Alexander's new book about an epic battle over a mathematical concept that shook the old order and shaped the world as we know it.

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Latest Planetary Radio Appearances

Phoenix is on its way to Mars

Phoenix is on its way to Mars

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