Astronauts have been able to cast ballots from above since the Texas legislature gave its blessing in 1997. "It's critical to participate in our democracy," NASA astronaut Kate Rubins said.

Environmental groups said they would continue to fight the development of a spaceport in Camden County.

The sun can affect people's electronics, the power grid and communications and navigation systems. But scientists predict that for the next decade or so, the sun's activity will not be too disruptive.

Scientists have found a gas associated with living organisms in a region of Venus' atmosphere. They can't figure out how it got there if it didn't come from life.

The mission took place this past weekend, shrouded in secrecy, but some clues are emerging about what China sent into space, and why.

Scientists and engineers in California are building a unique 3.2 billion pixel camera for a telescope under construction in Chile. The camera has taken its first test pictures — of broccoli.

An experiment involving some "mighty mice" on the International Space Station could someday help astronauts maintain muscle and bone strength on interplanetary journeys.

None of us is perfect, and sometimes the Hubble Space Telescope just flat-out points to the wrong spot in the sky. This has been happening more than ever in the last couple of years.

An experimental drug let mice spend a month in the International Space Station's near-zero gravity without losing mass. It could help people spend years in space without major health consequences.

Some unusual meteorites suggest that Earth got its water at its start, rather than forming dry and being watered by comets later on.

Scientists have long debated whether the Earth's water was here when the planet formed or whether it arrived later. A study suggests much of the water originated in rocks from which Earth is built.

The cable tore a gaping 100-foot hole in one of the largest radio telescope dishes in the world, taking the instrument offline until repairs can be made.

The light of the moon will reduce the visibility of some fainter meteors, but NASA says it's still worth staying up late — or rising very very early on Wednesday — to see "nature's fireworks."

Satellite images were once restricted to governments. Now anyone can get them, creating a new world of possibilities for environmentalists, human rights groups and those monitoring nuclear weapons.

NASA and SpaceX are welcoming home two astronauts who splashed down safely in the Gulf of Mexico after several months on the International Space Station.