Scientists have discovered how electrons gain enough energy to cause phenomenal auroral displays.
What's the weather like on other worlds? Expect methane rain, global haboobs and a 10,000-mile-wide hurricane.
Two decades' worth of Antarctic research reveals 5,200 tons of extraterrestrial dust lands on Earth each year.
NASA's long-serving Hubble Space Telescope is seeing double after detecting two rare pairs of quasars nestled within galactic collisions that occurred 10 billion years ago.