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10 Cards in this Set

  • Front
  • Back
scientific notation
the system of recording very large or very small numbers by using powers of 10
solar system
the sun and its planets, asteroids, comets, and so on
a small, nonluminous body formed by accretion in a disk around a protostar
a globe of gas held together by its own gravity and supported by the internal pressure of its hot gases, which generate energy by nuclear fusion
astronomical unit (AU)
average distance from earth to the sun
light-year (ly)
a unit of distance. the distance light travels in 1 year
a large sustem of stars, star clusters, gas, dust, and nebulae orbiting a common center of mass
Milky Way
the hazy band of light that circles our sky. produced by the glow of our galaxy
Milky Way Galaxy
the spiral galaxy containing our sun. visible in the night sky as the milky way
spiral arm
long spiral pattern of bright stars, star clusters, gas, and dust. spiral arms extend from the center to the edge of the disk or spiral galaxies