U ntil we live in a world based purely on sliding doors, door hinges will remain some of the most unsung heroes of our society. We'd still be able to saunter through door frames, ...

A quasi-satellite is an object that appears to go around the planet from the point of view of the planet but is not gravitationally bound. So, for the next several hundred years, 2004 GU9 will ...

Retrospectively, there were at least 14 other photographs of the quasi-planet that no one noticed at the time, going back to 1909. In 1929 — after a lot of legal battles between the Lowell ...

A quasi-moon is a large asteroid that orbits a ... it gets close enough to be drawn in by the Earth’s gravity and can go around our planet on its path but doesn’t actually orbit.

But Cardea is not a planet or a constellation. She is as a quasi-moon — a very-real type of asteroid that appears to be doing a special orbital dance around Earth. The International Astronomical ...

Big picture view: According to the International Astronomical Union, quasi-moons are asteroids that orbit the Sun in a similar way to that of a planet. Because of how they move, it appears to ...

Asteroids orbiting the sun in a similar path to Earth's, quasi-moons escort our planet on its journey a few centuries at a time. "Being a history buff who like empires, especially Roman ...

In truth, however, a quasi-moon follows an orbit around the sun (like an asteroid would) rather than the respective planet itself (like a standard old moon would). The mooniness of a quasi-moon is ...