UNIT 2 REVIEW STUDY GUIDE

PLANETS IN ORDER FROM THE SUN 1. MERCURY 2. VENUS 3. EARTH 4. MARS ASTROID BELT 5. JUPITER 6. SATURN 7. URANUS 8. NEPTUNE 9. PLUTO

Planets in order from smallest to biggest 1. Pluto – (Not technically a planet) .18 Earths – You could fit five Mercury’s in Earth 2. Mercury – .38 Earths – You could fit about 2.25 in Earth 3. Mars – .53 Earths – You could fit about 2 Mars in Earth 4. Venus – .95 Earths – Venus is about the same size as Earth 5. Earth – 6. Neptune – 3.8 Earths – You could fit about 4 Earths into Neptune 7. Uranus – 4.0 Earths – You could fit 4 Earths into Uranus 8. Saturn – 9.4 Earths – You could fit about 9.5 Earths in Saturn 9. Jupiter – 11.2 Earths – You could fit about 11.25 Earths in Jupiter

Here is a picture of a scale of the planet sizes.

COMETS, ASTROIDS, METEORS, METEORITES Which is which?

Comets Comets – Object made of ice, gas, and dust that travels through space

Asteroid Asteroid – A piece of rock that is in space and has not entered into the Earth’s atmosphere.

Meteors - Meteors – A piece of rock that has entered into the Earth’s Atmosphere but it burns up before it hits the Earth. (shooting star)

Meteorite Meteorite – meteor that strikes the Earth’s Surface