In the cold, distant reaches of the Solar System, far beyond Pluto, astronomers have just identified what could be a new ...

The presence of water-ice in the debris disk around a young star could have helped facilitate the growth and development of ...

If the object really is Planet Nine, it would be larger than Neptune and exist 700 times further from the sun than Earth.

Astronomers have discovered that "super-Earth" planets may exist on wider orbits than previously thought — and this implies these rocky, or "terrestrial," worlds are far more common than was suspected ...

The solar system's smallest planet is quickly approaching superior conjunction, so catch it in the morning sky while you can.

Tracking the sources of photons is a hobby of many astrophysicists. Some types of photons are tied so closely to particular ...

Visible for some five hours after sunset is Mars, making its way through Cancer. Shining at 1st magnitude, this ruddy point ...

For over a century, black holes have fascinated scientists with their mysterious nature. According to Einstein’s theory of ...

A New Population of Super-Earths in Distant Orbits Until now, most known super-Earths were detected in close orbits—within one astronomical unit (AU) of their stars, about the same distance as ...

An accurate measurement was crucial to determining the orbital positions of the planets as well as the mean distance between Earth and the sun, known as the Astronomical Unit. Both measures are ...