Understanding these ancient objects that sometimes produce cometlike tails may help explain how the solar system formed.
New research suggests gamma rays stunt plant growth.
Sunscreen and calcium supplements aren't enough to protect Mars-bound space travelers from radiation and a lack of gravity in outer space.
The four-year process of casting the sixth of seven primary mirrors for the Giant Magellan Telescope began this month.
Researchers and Aboriginal people are working to protect 3.5-billion-year-old stromatolite fossils in western Australia.
Miniature aircraft, powered by light, might offer new ways to explore the atmosphere of Earth -- or other planets.
How’s the weather up there? Even for exoplanets that are many light-years away, astronomers can learn about their atmospheres.
The heavenly orbs are not quite stars and not quite planets.
A quarter century of shoreline measurements show that the supermoon’s gravitational force drives more erosion.