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

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Perhaps soon humanity will discover whether there is room in the Solar System for another elusive planet. Read also: ...

"We are the first mission to be able to track space weather events in three dimensions routinely across the solar system." ...

While not a detection of life itself, this study shows that the Solar System may have been far more conducive to life in its distant past then we previously believed. Some 4.5 billion years ago ...