Raphael Rosen

A previously unknown asteroid spotted by a NASA telescope with a new lease on life is actually a comet, according to new observations.

A new atomic clock is due for installation on the International Space Station in 2016, ushering in a new age of physics experiments probing the relationship between space and time.

By peering into the haze of Saturn's huge moon Titan, scientists could learn more about how the atmospheres of alien worlds behave.

A new pair of running shoes may help you run a personal best, but a different kind of shoe could help spacefarers stay fit.

The next U.S. spacecraft designed to deliver astronauts to the International Space Station also need to act as lifeboats if something goes wrong on the orbiting outpost.

Earlier this year, astronomers celebrated the discovery of one of the youngest galaxies ever seen, but what was almost as astonishing was the way in which the far-off galaxy was found.

NASA is developing a new spacecraft to take mankind to deep space, and high school students will have an important role in designing it.

The engines of NASA's space shuttle will be reborn for the space agency's newest rocket, designed to take humans deeper into space than ever before.

This summer, astronauts on the International Space Station will test technology that may someday allow humans to remotely control robotic probes on alien worlds.

A science team at the Harvard-Smithsonian Center for Astrophysics wants to understand why you love cosmic photos.