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Nothing but the Facts About Halley's Comet

In the world of comets, Halley's Comet stands out for more reasons than one. Besides its visibility and relatively short orbital period, many facts about Halley's comet have been observed by -- and influenced -- human societies for more than 2...

Nothing but the Facts About Titan

What do you know about Saturn's aptly named moon Titan? For a planetary satellite, Titan has many unique features, including its large size (it's the second largest moon in the solar system) a thick and frigid atmosphere, and lakes...

MESSENGER to Mercury: Six Flybys Down, One to Go

MESSENGER was in the news again recently, but its biggest splash in the headlines is still more than two years away.

NEO Target: Earth: NASA Agency Tracks Potentially Hazardous Asteroids

NASA's Near-Earth Object Program works to find and track asteroids and comets whose orbits bring them close to our planet, creating the possible risk of an impact.

What Year did Galileo Make his First Telescope?

In 2009, the "The International Year of Astronomy," marked the 400th anniversary of the telescope. Galileo made the first telescope in 1609, an instrument that revolutionized -- and continues to revolutionize -- our view of the world and the universe...

Nothing but the Facts About Earth

Think you know everything about our home planet, Earth? Even some of the basic facts might surprise you:

Exploring the Many Causes of Space Weather and its Effects on Earth

The concept of space weather might seem strange, but it appears less so once you realize this kind of weather doesn't involve rain, snow, heat, cold or other atmospheric conditions.

Ancient Cosmology: Theories on the Origin of the Universe

People have been trying to understand the beginning of the universe -- what it is, why it is -- since the earliest days of civilization. Read on to fine ancient cosmology's various theories on the origin of the universe.

Venus Express Mission Hopes to Expand Upon Previous Missions to Venus

We've learned a lot about the planet Venus since 1962, when Mariner 2 discovered not the balmy, Earth-like planet scientists expected but our hellishly hot "evil twin." The ESA's Venus Express will help us understand even more about the...

Nothing But the Facts About the Constellation Cancer

The constellation Cancer is a rather dark and unspectacular member of the Zodiac, but some of the objects within it are more interesting than they appear to the naked eye.