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9 Cards in this Set

  • Front
  • Back

spectroscope

a tool that spreads light into different wavelengths

astromical unit

​the average distance between Earth and the Sun, about 150 million km

light year

​the distance that light travels in one year, 300,000 km/s

appearent magnatude

​a measure of how bright an object appears from Earth

luminosity

​the true brightness of an object

galaxy

​a huge collection of stars

dark matter

​matter that emits no light at any wavelength

big bang theory

​the universe began from one point billions of years ago and has beenexpanding ever since

doppler shift

​the shift to a different wavelength