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Ch. 2 Study Stack

Astronomy

TermDefinition
moon a natural satellite that revolves around a planet
orbit the path of an object as it revolves around another object in space
ellipse an elongated circle, or oval shape; the shape of the planets' orbits
inertia an object will stay still or keep moving at the same speed in the same direction until a force acts upon it
gravity its strength depends on mass and the distance between objects
sun our star that produces heat and light (energy!)
star the sun is the only one of these in our solar system
planet a spherical object that revolves around the sun with nothing else in that orbital path
terrestrial planets the name given to the 4 inner planets: Mercury, Venus, Earth, & Mars
greenhouse effect the trapping of heat by a planet's atmosphere
gas giants the name given to the 4 outer planets: Jupiter, Saturn, Uranus, and Neptune
dwarf planet* a large, spherical object that revolves around the sun with other things in that orbital path
comet a ball of ice and dust whose orbit is a long, narrow ellipse.
asteroid larger rocks (not spheres) that revolve around the sun
asteroid belt the region of the solar system between the orbits of Mars and Jupiter
meteoroid smaller rocks (not spheres) that revolve around the sun
meteor a streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
meteorite a meteoroid that has hit Earth's surface
Oort Cloud the sphere that surrounds the sun; it is full of every solar system object that is attracted to the sun because of its massive gravity
Kuiper Belt a ring of rocky and icy objects revolving around the sun outside of Neptune's orbit
Created by: DiNapoli