For more than 100 years, physicists have known — at least on paper — that spinning black holes should stir the universe ...

A supermassive black hole was caught twisting spacetime, offering the clearest real-world evidence yet for Einstein’s ...

The cosmos has served up a gift for a group of scientists who have been searching for one of the most elusive phenomena in ...

Astronomers have observed a star wobbling in its orbit around a ravenous supermassive black hole that is ripping it apart and ...

Earth's axial precession, a slow wobble of its rotational axis, is analogous to the gyroscopic motion of a spinning top. The primary cause of Earth's precession is the gravitational influence of the ...

Toy gyroscopes can do all kinds of interesting tricks. The most mysterious one, precession, seems to defy gravity. By definition, precession refers to a change in the orientation of the rotational ...

The Gregorian calendar accounts for the discrepancy between the length of a solar day and a solar year (approximately 365.25 days). The calendar also addresses the difference between a sidereal year ...

ALTHOUGH the Earth revolves around the Sun, from our point of view we see the Sun moving around the sky along an imaginary circle called the ecliptic once every 365.256 days. This is known as the ...