Phenomenon
Einstein Cross
Four images of one distant source.
A gravitational lensing configuration producing four images of a background quasar arranged in a cross around the lensing galaxy.
Overview
A gravitational lensing configuration producing four images of a background quasar arranged in a cross around the lensing galaxy.
See also
Strong Gravitational Lensing
Gravity dramatically warping distant images.
Solar Eclipse
When the Moon stands between Earth and Sun.
Lunar Eclipse
When Earth's shadow falls on the Moon.
Meteor Showers
Cosmic dust burning in our atmosphere.
Aurora (Northern/Southern Lights)
Solar wind painting the upper atmosphere.
Supernova
The catastrophic death of a massive star.