Astronomers have discovered what they believed to be a rare stable trio of gravitationally bound Kuiper Belt objects, offering new clues to the enduring "3-body problem."
The U.S. House of Representatives is considering a bill, the "No Invading Allies Act," that would bar military action against Canada, Panama, and Greenland.
A near-Earth asteroid discovered by astronomers late last year that showed a rising potential for colliding with Earth has been downgraded, according to planetary defense experts.
A groundbreaking invention that produces fuel from thin air could transform atmospheric carbon dioxide from a threat into a potentially valuable resource.