Topic 6 Vocab

An imaginary line about which the planet rotates

• axis

• north pole

• south pole

• ellipse

The scientific law that states every object in the universe attracts every other object

• law of universal gravitation

• law of conservation of mass

• law in conservation of momentum

• law of the land

The periodic rise and fall of the level of water in the ocean

• tide

• wave

• precipitation

• tsunami

A pattern or group of stars that people imagine represent a figure or object

• constellation

• comet

• meteor

• planet

The movement of an object around another object

• revolution

• rotation

• axis

• ellipse

Either of the two days of the year on which neither hemisphere is at the center of the revolving planets and stars.

• equinox

• solstice

• umbra

• prenumbra

The partial or total blocking of one object in space by another

• eclipse

• planet

• umbra

• rotation

One of the different apparent shapes of the moon as seen from Earth

• phase

• planet

• eclipse

• poles

Term describing a model of the solar system in which Earth and the other planets revolve around the sun.

• heliocentric

• geocentric

• heliotropic

• geosphere

The attractive force between objects

• gravity

• inertia

• umbra

• rotation