Unit 1 and 2 Book G exam Mr. Wake

Sun Centered

• Heliocentric

• Geocentric

Earth-Centered

• Heliocentric

• Geocentric

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

• gravity

• Aphelion

• Perhelion

point in a planet's orbit that is farthest from the sun

• gravity

• perhelion

• aphelion

When the planet is closest to the sun.

• gravity

• perhelion

• aphelion

Mercury, Venus, Earth, Mars

• Terrestial Planets

• Gas Planets

Jupiter, Saturn, Uranus, Neptune

• Terrestial Planets

• Gas Planets

Italian astronomer and mathematician who was the first to use a telescope to study the stars

• Galileo Galilei

• Nicholas Copernicus

a diagonal area on an H-R diagram that includes more than 90 percent of all stars

• Star

• Nebula

• Supernova

• Main Sequence

a cloud of gas and dust

• Star

• Nebula

• Supernova

• Main Sequence