Space.com on MSNOpinion

The universe should be packed with tiny galaxies — so where are they?

There may not be as nearly as many small galaxies in the early universe as astronomers predict there should be, which has big ...

Jupiter's hidden depths: Simulation suggests planet holds 1.5 times more oxygen than the sun

Spectacular clouds swirl across the surface of Jupiter. These clouds contain water, just like Earth's, but are much denser on ...