Though Pluto has formally been considered a dwarf planet for almost two decades, it still has many lessons left for planetary scientists — including hints about how the solar system formed.

A new study of astronaut blood finds that space travel reduces the expression of 100 genes related to the immune system.

NPR's Scott Simon contemplates the growing dining options for astronauts aboard the space station, including tacos, chile and even lobster.

For a long time, the Catholic Church rejected scientific findings that conflicted with its doctrine, even persecuting Galileo. Now the Vatican looks to promote its observatory as a bridge to science.

Something went boom in outer space and sent radioactive stardust our way, and it's just been found at the bottom of the ocean.

A Russian satellite hatched from another satellite fired a projectile last week that American military officials say is meant to take out other satellites. Moscow says it's an inspection tool.