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Gravity/Universe

Space Distance and Objects

TermDefinition
astronomical unit (AU) the average distance between the Sun and the Earth, 150,000 million km, 93 million miles
light year the distance light travels in one year, 9.46 trillion km, 5.88 trillion miles
rotate movement of an object on its axis, one day
revolve movement of an object in its orbit around the Sun, one year
gravity a force that every object exerts on another object because of mass, determined by mass and distance between objects
planet an object that orbits the Sun, is spherical in shape, and has cleared its orbit
dwarf planet do not have clear orbits and are made of rock and ice, at least 5 in our solar system
asteroid small, rocky, oddly shaped objects that orbit the Sun in the asteroid belt which separates the inner and outer planets
comets made of gas, dust, and ice and have an oval shaped orbit around the sun
meteors shooting stars, made of metal and rock
star a giant ball of super hot plasma, hydrogen fuses into helium during nuclear fusion creating heat and energy
solar system part of a galaxy, containing at least one star, orbiting planets, and smaller objects
galaxy a massive collection of billions of stars, gas, dust, and dark matter, all bound together by gravity
universe all matter (planets, stars, galaxies, you), all energy, space, and time, originating from a hot, dense point about 13.8 billion years ago in the Big Bang and constantly expanding
geocentric model the model of the universe showing all objects orbiting in a circular orbit around a central, stationary Earth
heliocentric model the model of the solar system showing planets orbiting in an elliptical orbit around the Sun
Created by: user-1960358
 

 



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