Ed Shanahan, the editor of Metropolitan Diary, joins us in October to chat with teenagers about writing tiny memoirs. Post your comments and questions for him by Oct. 16. By The Learning Network What ...

The number of rocky extrasolar planets being discovered continues to increase, but so too does the apparent diversity of such worlds.

Look west on September 18, when the planet reaches peak brilliance. Here’s what makes it so bright and how to see its crescent through a telescope.

Venus may once have had a moon, but the planet's unusually slow rotation could have caused the satellite to spiral towards it and eventually be destroyed, according to a new study. Venus is similar to ...

Venus is often called Earth’s twin. The two planets are remarkably similar in size, mass, and composition, and both formed in the same region of the solar system. Yet despite these similarities, Venus ...

This week, we capture worlds and stars in motion, from Anak Krakatau erupting on Earth and dust cascading down Martian slopes ...

LOS ANGELES — A California-based astrophysicist presented a new theory on Monday to explain why Venus, the planet most like Earth in size, mass and structure, lacks its own moon. Call it a case of ...

Scientists have long speculated why Venus, with a size, mass and structure similar to Earth's, doesn't have a moon. New UC ...

Venus is something of a frustration for stargazers. It's the brightest planet and the easiest to see, while the sight of it close to a crescent moon is one of the most achingly beautiful sights in the ...

A new theory may finally explain why Venus, Earth's closest planetary twin, has no moon -- and the answer, scientists say, is that it probably ate one. An astrophysicist at the University of ...