Universe Review

Meteoroid

a small body moving in the solar system that would become a meteor if it entered the earth's atmosphere.

Meteor

A meteoriod that burns up in Earths atmosphere

Meteorite

A meteor that strikes the surface of a planet.

Comet

Space object made of dust and rock paricles mixed with frozen water and gases

Asteroid

A peice of rock or metal made up of similar material that formed planets.

Elliptical Galaxy

a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless brightness profile

Spiral Galaxy

a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.

Irregular Galaxy

A galaxy that does not have the clearly defined shape and structure of typical elliptical, or spiral galaxies.

Nebula

A large cloud of dust and gas

Light year

The length that light travels in a year.

Rotation

The spinning of Earth on its axis

Equinox

Each of the two times of the year when days and nights are of equal length

Solstice

The point at which the sun is as far north or as far south of the equator as possible

Revolution

The movement of an object around another object

23.5 degree tilt

What tilt does earth's axis of rotation have?

Axis

an imaginary line about which a body rotates.

Sun spots

dark areas on the sun's surface

Solar flare

A sudden eruption of intense high-energy radiation from the sun's surface

Gravity

A force of attraction between objects that is due to their masses.

Gravitational pull

The force of gravity between two objects like the Earth and the Sun and the Earth and the moon.