Astronomy

Astronomy

The scientific study of planets, stars, black holes, comets and other celestial bodies that make up outer space.

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Astronomy > Galaxy

gravitational lens

Astronomy; Galaxy

Refers to a distribution of matter (such as a cluster of galaxies) between a distant source (a background galaxy) and an observer, that is capable of bending (lensing) the light ...

Atacama Large Millimeter/submillimeter Array (ALMA)

Astronomy; Galaxy

A space observation system that consists in an array of large 40-foot (12-meter) radio telescopes installed in the Atacama desert of northern Chile. The high precision telescopes, ...

blue shift

Astronomy; Galaxy

A shift in the wave-length of radiation emitted by an object when it is approaching us; the Doppler shift makes the wave fronts bunch closer together, causing the light to appear ...

Casimir effect

Astronomy; Galaxy

The attractive pressure between two flat, parallel metal plates placed very near to each other in a vacuum; the pressure is due to a reduction in the usual number of virtual ...

stellar classification

Astronomy; Galaxy

Stars are given a designation consisting of a letter and a number according to the nature of their spectral lines which corresponds roughly to surface temperature. The classes ...

galactic halo

Astronomy; Galaxy

A spherical region surrounding the center of a galaxy. This region may extend beyond the luminous boundaries of the galaxy and contain a significant fraction of the galaxy's mass. ...

gravitational waves

Astronomy; Galaxy

Ripples in space-time caused by the motion of objects in the universe. The most notable sources are orbiting neutron stars, merging black holes, and collapsing stars. ...