Space looks empty until you try to cross it. Far beyond Pluto, where sunlight is faint and the planets are long behind, NASA’s New Horizons spacecraft is moving through a region where the Sun’s ...

This artist’s rendition shows NASA’s Parker Solar Probe approaching the Sun. Steve Gribben/Johns Hopkins APL/NASA via AP Our Sun drives a constant outward flow of plasma, or ionized gas, called the ...

NASA’s Magnetospheric Multiscale Mission has uncovered surprising behavior of pickup ions drifting through the solar wind near Earth. These particles, once thought to be minor players, appear capable ...

ESA's Solar Orbiter spacecraft has provided crucial data to answer the decades-long question of where the energy comes from to heat and accelerate the solar wind. Working in tandem with NASA's Parker ...

The moon's thin atmosphere, called an exosphere, has been a puzzle to science for some time. Two main processes were thought to create this wispy gas envelope; tiny meteoroids hitting the surface and ...