Natural science: solar system

Which planet is closest to the sun?

• Uranus

• Mercury

• Neptune

• Earth

Which planet is fifth from the sun?

• Saturn

• Jupiter

• Mars

• Earth

A ball of ice and dust with a tail of gas and dust pointing away from the sun.

• Asteroid

• Comet

• Moon

• Meteor

A small rocky object orbiting the sun.

• Asteroid

• Comet

• Moon

• Meteor

A natural satellite of a planet.

• Asteroid

• Comet

• Moon

• Meteor

The four inner planets are...

• Rocky and small

• Very large and made of ice

• Small and made of ice

• Very large and made of gases

The outer planets are...

• Rocky and small

• Very large and made of ice

• Small and made of ice

• Very large and made of gases

What holds the planets in their orbits around the sun?

• gravity

• speed

• string

• air currents

Earth's ________ on its axis causes day and night.

• rotation

• revolution

• phase

• comet

One full orbit of an object around another object is called a ________.

• axis

• rotation

• revolution

• satellite