A few decades ago, the Solar System had nine ... have to discover in space and how many mysteries even seemingly close regions of outer space hold. For now, the Ninth Planet remains in the realm ...

The two exoplanets, or planets outside of our solar system, orbit a star called TOI-1453, which is slightly cooler and ...

In reality, there are hundreds, if not thousands, of natural satellites, in our cosmic neighborhood, ranging from irregular town-size space ... solar system. One such world is the elusive Planet ...

Neptune lies in the frigid, dark, vast frontier of the outer edges of our solar system, about 3 billion miles away from the ...

The findings provide strong evidence that four giant exoplanets 130 light-years from Earth formed much like Jupiter and ...

A new classification scheme may help us better understand planet formation — including the history of our own family of worlds.

Back in 1969, when Neil Armstrong and Buzz Aldrin first set foot on the moon, scientists knew of just 31 other moons in our ...