Unit 1 The Universe Vocabulary Review
a large celestial body that is composed of gas and emits light star
a graph that shows the relationship between a star’s surface temperature and absolute magnitude H-R diagram
a gigantic explosion in which a massive star collapses and throws its outer layers into space supernova
a star that has collapsed under gravity to the point that the electrons and protons have smashed together to form neutrons neutron star
a small, hot, dim star that is the left over center of an old sun-like star white dwarf
space and all the matter and energy in it universe
the brightness of a star as seen from Earth apparent magnitude
a collection of stars, gas, and dust held together by gravity galaxy
location on the H-R diagram where most stars lie; it has a diagonal pattern from the lower right to the upper left main sequence
a measure of how bright a star would be if it were seen from a standard distance absolute magnitude
the distance light travels in a year; about 9.6 trillion km light-year
a large cloud of gas and dust in interstellar space; a region where a star is born nebula
the Sun and all the planets and bodies that travel around it solar system
the actual brightness of an object such as a star luminosity
a relatively large spherical body that orbits a star planet