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 ...

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

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