solar system

Select all that apply

Which are true about the terrestrial planets? 3 answers

• They formed by the merging of planetesimals in the inner part of the main disk.

• They are composed of elements that did not vaporize.

• They formed by the merging of icy planetesimals near the outer part of the main disk.

• They are rocky and dense.

Which planet is hotter?

• Mercury

• Uranus

• Neptune

• Saturn

A man made object or vehicle intended to orbit the earth, the moon

• satellite

• rocket

• asteroid belt

• meteorite

What is the sun?

• a moon
• a planet
• a star

Which planet is between Mars and Saturn?

• Mercury

• Jupiter

• Earth

• Uranus

Mars is the ________ planet from the sun.

• 5th

• 4th

• 3rd

• 9th

Early astronomers thought that all objects in space orbited Earth. What is the name for this early model of the solar system?

• Copernican model

• heliocentric model

• geocentric model

• Keplerian model

What do the outer planets have in common?

• They are much larger than Earth and are made mainly of Hydrogen and Helium

• The are about the same size as Earth and are mostly made of Hydrogen and Helium

• They are must larger than Earth and are mainly made of iron

• They are the same size as Earth and are mainly made of iron

The solar system consists of the sun and all the other planets that orbit it.

• True

• False

How many planets are in the solar system?

• 9

• 10

• 8