Vocabulary Chapter 17 and 18

Chapter

Vocabulary

17.1

Nebula – nebulae

Solar system

Solar nebula

Planetesimals

Rotation

Revolution

Orbit

Period of revolution

Period of rotation

Keplers 1^st law of motion

Kepler’s 2^nd law of motion

Kepler’s 3^rd law of motion

Gravity (what happens when the distance increases between objects)

18.1 and 18.2

Astronomical unit (au)

Terrestrial planets

Prograde rotation

Retrograde rotation

Gas giant

Outer planets

Solar eclipse

Lunar eclipse

18.3

Comet

Asteroid

Asteroid belt

Meteoroid

Meteorite

meteor

Aphelion

Perihelion

Chapter 19  We will have a separate test on Chapter 19.