Do the periods of comets decrease because they lose mass every time they get near the Sun? Robert BaileyConover, Wisconsin ...

Northern Michigan will have a low chance of viewing the northern lights Saturday night, with a G1 minor solar storm expected, ...

He has given reasons for thinking that in former ages the period of rotation of Mars was much shorter than at present, but that by tidal action of the sun this period has been gradually lengthened ...

You might think that, because the length of the tide cycle is determined by the Earth's rotation, the tide cycle should be 24 hours long. The reason it's longer is that, during a 24-hour period ...

In a world first, Japanese researchers used the Fugaku supercomputer to reproduce imbalances in the sun’s rotation, a phenomenon that has puzzled astronomers for centuries. The scientists from ...

as they orbit the Sun. The time it takes to spin once — one “day” on a comet — is also called a period, but in this case, it is specifically called the rotational period. Just in case you ...