Loading…
Loading contentLoading…
Loading contentThe relativistic effect by which time runs slower for fast-moving observers and deeper in a gravitational field. It is measured every day — GPS satellites must correct for it — and it steepens near neutron stars and black holes, where clocks near the horizon crawl relative to distant ones. Even distant supernovae are seen to fade in slow motion as the Universe expands.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.