a large, round object that revolves around a star and has cleared the region around its orbit.

• planet

• moon

• inner planet

a natural object that revolves around a planet.

• planet

• moon

• inner planet

the four closest planets to the sun

• planet

• moon

• inner planets

Inner planets have rocky surfaces.

• true

• false

What are the four inner planets?

• Venus, Saturn, Uranus, Neptune

• Mercury, Venus, Earth, Neptune

• Mercury, Venus, Earth, Mars

Which planet would have a shorter year?

• Earth

• Mars

Tags

NGSS.MS-ESS1-2

a spacecraft that gathers data without a crew

• space probe

• rocket ship

• cell phone

What planet is closest to the sun?

• Mars

• Pluto

• Mercury

• Earth

Mercury is covered in

• ketchup

• rust

• craters

What was the first space craft to land on Mars?

• Viking I

• Spirit and Opportunity

• Mariner 10