Lesson 3-6 science Vocab

Front

Force pulling objects together, like Earth's pull.

Back

Gravity

Front

Path an object takes moving around another in space, like Earth around the Sun.

Back

Orbit

Front

Farthest point in a planet's orbit from the sun.

Back

Aphelion

Front

Closest point in a planet's orbit to the sun

Back

Perihelion

Front

Force keeping objects in circular motion, like gravity for planets.

Back

Centripetal force

Front

Dust cloud in space where the sun and planets formed.

Back

Solar nebula

Front

A small building blocked a planet formed early in the solar system.

Back

Planetesimal

Front

A planet made mostly of rock, like Earth, Mars, Venus, and Mercury

Back

Terrestrial planet

Front

Distance in space from Earth to Sun

Back

Astronomical Unit

Front

A large planet mostly of gas, like Jupiter and Saturn

Back

Gas Giant