time

NASA's Gravity Probe B spacecraft has gathered all the data physicists need to check a bizarre prediction of Einstein's relativity.

Astronomers spot hot iron gas riding a giant ripple in warped fabric of space and time around a huge gravity well.

Wednesday's eclipse will involve many subtle stages. Here's a minute-by-minute guide.

Earth's spin warps space around the planet, according to a new study that confirms a key prediction of Einstein's general theory of relativity.