Most people hear “spacecraft” and envision rockets blasting into space, but they’re often not aware of the meticulous ...

Helium can help scientists detect the speed and direction at which we’re moving through space. Deuterium, which is left over ...

The heliosphere is so large that objects in the Kuiper Belt orbit closer to the Sun than to the closest boundary of the heliosphere. As distant stars explode, they expel large amounts of radiation ...