Solar System, Planets, Stars, Galaxies

Term Definition
Asteroid rocky objects that orbit the sun
Comet made of gas, dust, ice and moves around the sun in an oval-shaped orbit
The Sun is a star made of mainly hydrogen gas and it's diameter is ten times the diameter of Jupiter
Dwarf Planets spherical object that orbits the sun. Ceres, Pluto, Eris
Terrestrial Planets are the planets closest to the sun, made of rock and metal and have solid outer layers.
Gas Giants primarily made of hydrogen and helium. Jupiter, Saturn, Uranus, Neptune.
Neil deGrasse Tyson an astrophysicist who questioned Pluto's classification as a planet.
Meteoroid small, rocky particle that moves through Earth's atmosphere.
Meteor streak of light in Earth's atmosphere made by a glowing meteoroid.
Meteorite is a meteoroid that strikes a planet or a moon
Light Year is the distance light travels in 1year. 300,000km/s
Star large ball of gas held together by gravity with a hot core where nuclear fusion occurs.
Nebula a cloud of gas and dust
Supernova an enormous explosion that destroys a star.
Black Hole an object whose gravity is so great that no light can escape.
Galaxies are huge collection of stars. Spiral, Irregular, Elliptical
Big Bang Theory the universe began from one point billions of years ago and has been expanding ever since.

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