Astronomy study time
Terms
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- 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
- planet
- a small, nonluminous body formed by accretion in a disk around a protostar
- star
- 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
- galaxy
- 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