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A B C D E

The inner planets

have this in common

What is a small rocky surface?

These are the names of the gas giants.

What are Jupiter, Saturn, Uranus and Neptune?

The largest and most massive planet

What is Jupiter?

Neptune is very similar in size and color to this

planet.

What is Uranus?

This inner planet once had liquid water on its surface.

What is Mars?

The gas giants can’t let this escape into space because

the planets have very strong gravitational pulls.

What is their atmosphere?

This is the direction Uranus rotates.

What is on its side?

This force tends to pull together the matter in stars.

What is gravity?

This is likely to happen to the universe in the future.

What is, it will expand forever?

A loose grouping of a few thousand stars.

What is an open cluster?

Saturn’s rings are made up mostly of

these types of chunks.

What are chunks of ice and rock?

This may indicate that a planet may exist near a distant star.

What is a wobble or slight forward and backward

motion?

This supports the hypothesis that Mars may once have had

the conditions needed to support life.

What is evidence that liquid water was once

present?

The four outer planets have this in common.

What is they are larger than Earth and are made mainly of hydrogen and

helium?

This explains why many large optical telescopes are

located on mountains.

What is so they can be above the atmosphere?

A meteoroid that enters Earth’s atmosphere

produces this streak of light.

What is a meteor?

The mysterious force that may be causing the

expansion of the universe to accelerate.

What is Dark Energy?

Astronomers predicted the existence and orbit of Neptune based on this.

What is Neptune’s gravitational effect on the

orbit of Uranus?

Meteroids usually come from these.

What are comets or asteroids?

One of the conditions required for life on Earth is this liquid.

What is water?

For this reason, Europa is considered a good place to

look for life.

What is there may be liquid water under its icy

crust?

This is the shape of the orbits of most comets .

What are long narrow ellipses?

The smallest terrestrial planet.

What is Mercury?

These are two ways Venus and Earth are much alike.

What is their size and density?

The asteroid belt is located here.

Where is between Mars and Jupiter?