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Planets

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Stardust encounter with comet

The Secrets Within Cosmic Dust

Dust captured by a spacecraft from a comet's tail holds clues to the origin of the solar system
December 2009 | By Robert Irion

Saturn

Fantastic Photos of our Solar System

In the past decade, extraordinary space missions have discovered new features of the Sun, the planets and their moons
October 2009 | By Laura Helmuth

Maria Zuber

On the surprise evidence of flowing water on Mars
February 2007 | By Laura Helmuth

Though the exoplanets found to date are in our galaxy, most are about 100 light-years away.

The Planet Hunters

Nevermind the demotion of Pluto to a dwarf planet. Astronomers have found about 200 planets orbiting other stars, and they say it's only a matter of time before they discover another Earth.
October 2006 | By Robert Irion

A Martian meteorite fueled speculation and debate in 1996 when scientists reported that it held signs of past life. The search now moves to Mars itself.

Life on Mars?

It's hard enough to identify fossilized microbes on Earth. How would we ever recognize them on Mars?
May 2005 | By Carl Zimmer

A Bumpy Road to Mars

The president envisions a future human mission to Mars, but medical researchers say surviving the journey is no spacewalk
June 2004 | By Jane Ellen Stevens

No Place Like Home

December 2002 | By Terence Monmaney


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