On the surprise evidence of flowing water on Mars
A unique sundial marks places as well as hours
The first mission to collect space matter from beyond the moon offers insights into the solar system's creation
Rob Irion spoke with Amy Crawford about his article, "The Planet Hunters"
Why our solar system just shrank
Astronomers have found about 200 planets orbiting other stars, and they say it's only a matter of time before they discover another Earth
You can't believe everything you think
In a new book written with his wife, Nancy Abrams, cosmologist Joel Primack argues that the universe was meant for us. Sort of
A generation later, the first female astronaut is still on a mission
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