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Cosmos the world or universe regarded as an orderly system
Cosmological Redshift elongating of light waves as they travel across an expanding universe; as the wavelength of light stretches, it becomes redder in color, thus the name cosmological redshift.
Light year distance that light travels in one Earth year; a light year is a unit of DISTANCE, about 10 trillion kilometers; we use light years to measure distance in the universe because the distances are so big.
Magnitude brightness of a star.
Apparent magnitude how bright a star seems to us on Earth.
Absolute magnitude of a star is how bright the star actually is.
Parallax apparent shift in the position of an object.
Parsec unit of distance equal to 3.26 light years.
Alpha Centauri other than the sun, the star closest to Earth; about 4 light years or 13 parsecs away.
Created by: Ruth.Miller