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Light Year
Light year definition: The distance light travels in a year: 9.5 trillion km.
Related Terms
Absolute Magnitude
Apparent Magnitude
Big Bang Theory
Binary Star
Black Hole
Chromosphere
Constellation
Corona
Cosmic Background Radiation
Electromagnetic Spectrum
Galaxy
Globular Cluster
Hertzsprung Russell Diagram
Hubbles Law
Main Sequence
Nebula
Neutron Star
Nuclear Fusion In The Sun
Open Cluster
Parallax
Photosphere
Protostar
Pulsar
Quasar
Solar Wind
Supernova
Universe
White Dwarf
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