"This whole thing happened because of an extra credit assignment for my astronomy class at UGA." Until we live in a world based purely on sliding doors, door hinges will remain some of the most ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Until we live in a world based purely on sliding doors, door hinges will remain some of the most ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Timelapse of near-Earth asteroid/Earth quasi-satellite 2004 GU9 moving across the sky in ...

The next quasi-satellite in the solar system now has an official name. Cardea is a companion of the Earth and was discovered more than 20 years ago. Quasi-satellites or quasimoons are a special ...