Astronauts sent to colonize Mars should avoid getting pregnant en route to the Red Planet.
From private spaceflights, to NASA missions to the moon, Mars and beyond, here's a preview of coming attractions in U.S. spaceflight for 2011.
Researchers are building a better picture of one of the most important changes in the early universe.
The dwarf planet Eris has been found to have a surface much like Pluto's and still harbors surprises five years after its discovery.
A new video of the second biggest asteroid in the solar system is giving astronomers a better sense of how the object spins.
Scientists have a new origins story for a massive black hole that spews X-rays as it orbits an even larger companion star.
Astronomers have found evidence of buckyballs — carbon molecules shaped like soccer balls — in the nebula around a distant white dwarf star.
Astronomers have found a disk of dust around a huge, massive star in its early stages of growth, indicating that stars big and small form by the same mechanism.