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This cosmonaut stunned the world on April 12, 1961, when he became the first person to venture to space. Read more >>>
Brush up on your eclipse basics before the big day, when millions of Americans will witness the Moon blot out the Sun. Read more >>>
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Put another way, spaceship Earth hasn't had all its humans onboard for two full decades. Read more >>>
Watch editor David J. Eicher introduce his latest book on galaxies, or order now!
How a group of students sparked a return to the Red Planet.
Dark, dusty skies.
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Enjoy putting together this 500-piece puzzle featuring Mystic Mountain.
Without our satellite, the planet would wobble, dramatically affecting seasons and climate.
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Space artists discuss the first black hole image.
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