Hall thrusters (HTs) are used in earth-orbiting satellites, and also show promise to propel robotic spacecraft long distances, such as from Earth to Mars.
Brown dwarfs have powerful winds and clouds -- specifically, hot patchy clouds made of iron droplets and silicate dust.
A novel mission concept involving two CubeSats connected by a thin, miles-long tether could help scientists understand how the Moon got its mysterious "tattoos" -- swirling patterns of light and dark found at more than 100 locations across the lunar surface.
Hidden from our sight, the Westerhout 43 star-forming region is revealed in full glory in this far-infrared image from ESA's Herschel space observatory.
Scientists have helped solve the mystery of what lies beneath the surface of Neptune - the most distant planet in our solar system.
The aurora and the night sky above Earth's atmosphere are pictured from the space station.
