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Activity 1

scale to cosmologist

TermDefinition
scale a representation of the size of something
universe the whole of all existing matter, energy, and space
galaxy star system held together by gravitational attraction; contains solar system and other objects
solar system planets and other objects orbiting a star(s)
astronomical unit (AU) a unit of measurement equal to the average distance between the Sun and Earth (about 150 million km or 93 million miles)
light-year a unit of measure representing the distance light travels in one year (9.46 x 1012km)
parsec large distances such as galaxy to galaxy; 1 parsec = 3.26 light-years
nebula general term used for any “fuzzy” patch on the sky, either light or dark; a cloud of swirling gas and dust
nebular theory idea that the solar system evolved from a swirling cloud of gas and dust
constellation grouping of stars in the night sky
planetesimals one of the small bodies that formed from the solar nebula and eventually grew into protoplanets; matter that clumps together in small masses
protoplanetary bodies a clump of material, formed in the early stages of solar system formation, which was the forerunner of the planets we see today; planetesimals clumping together
nuclear fusion a nuclear process where atoms combine together to create energy; creates Sun’s energy
terrestrial planets any of the planets, Mercury, Venus, Earth, or Mars, or a planet similar in size, composition, and density to the Earth; consists mainly of rocky material
gas giants the outer solar system planets; Jupiter, Saturn, Uranus, and Neptune, composed mostly of hydrogen, helium, and methane
comets a chunk of frozen gases, ice, and rocky debris that orbits the Sun
asteroids a small planetary body in orbit around the Sun, larger than a meteoroid but smaller than a planet; many found in a belt between Mars and Jupiter
cosmologist a scientist who studies the origin and dynamics of the universe
Created by: shelly_spangler
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