The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

February will be an awe-inspiring month for astronomy enthusiasts who will be able to the see the solar system's planets ...

While the planets are technically always "aligned" along the same plane in our sky, seeing so many at once is a special ...

Six planets are parading across the sky, appearing as some of the night's brightest stars. A few easy tips can help you ...

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

Sky watchers are in for a treat this month as the stars align to give amateurs a shot to see six planets at once.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

Starting up again Saturday, a sweeping view of our solar system will glow in the night sky. The planetary alignment, or a ...