Astronomers say they spotted signs of a giant explosion releasing from a star beyond our solar system, one powerful enough to ...

There are no confirmed exomoons, moons orbiting distant exoplanets in other solar systems. There are a few candidates, but ...

Water isn't just delivered to planets by comets and asteroids — it can also be forged as worlds form, a new study finds.

NASA’s latest mission, designed to study the effects of the solar wind on the atmosphere of Mars, was ironically delayed on ...

Extra-solar planets are among the most thrilling discoveries of our age. Just today, scientists using Spitzer space telescope data announced the first detection of infrared light from an extra-solar ...

At a young age, we're told how the sun warms Earth and makes life possible. That idea sticks with most of us for life. But ...

Our solar system is a smashing success. A new study suggests that from its earliest period — even before the last of its nebular gas had been consumed — Earth’s solar system and its planets looked ...

Nearly a century after Pluto’s discovery, astronomers are still hunting for mysterious planets beyond Neptune - including a ...

NEW YORK (AP) — Seven planets grace the sky at the end of February in what's known as a planetary parade, though some will be difficult to spot with the naked eye. These planetary hangouts happen when ...

Nicole Granucci does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Mark Sykes says that if a non-stellar object is massive enough to be round and orbits a star, it ought to be a planet. The key here is that once an object gets that big, important geophysical ...