The Milky Way is not the neat, flat pinwheel many of us learned about in school. Fresh data from precision star maps now show ...

A doomed star spiraling into a supermassive black hole has given physicists one of their clearest looks yet at how gravity ...

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

Astronomers have observed a star wobbling in its orbit around a ravenous supermassive black hole that is ripping it apart and feasting on its stellar material. The observation is ...

Based on Einstein's theory, they demonstrated that if a massive object rotates rapidly, it drags space-time along with it.

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 ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The Earth's precession is captured in stunning detail in this image by a veteran ...