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  • 更新 2022-09-03
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We live on Planet Earth, the third planet from the sun. But think about this, what if we lived on the fourth planet from the sun—Mars? Earth and Mars both belong to the solar system. There are many things about them that are the same and different. Let’s compare them and think about how different things would be if we lived on Mars.

Facts
Earth
Mars

Orbit(轨道) around the sun
Moves at about 99,999 kilometers per hour
Takes 365 days to make one trip around the sun
Earth always keeps the same distance from the sun
Moves at 87,226 kilometres per hour
Takes 687 Earth days to make one trip around the sun
Mars is not always the same distance from the sun. It is 205,996,032 kilometres from the sun when it is closest. It is 249,448,320 kilometres from the sun when it is furthest away.
Seasons
Autumn
about 90 days
146 days
Winter
about 90 days
160 days
Spring
about 90 days
199 days
Summer
about 90 days
90 days
Length of Day
24 hours
24 hours, 7 minutes
Gravity
A 45-kilogram person on Earth would feel 62% lighter in weight because there is less gravity at the Martian surface. That is about 17 kilograms.
Atmosphere
21% oxygen
95% carbon dioxide – no oxygen
Number of Moons
One
Two

How many kilometers does Earth move every hour?

A.99,999. B.87,226. C.205,996,032. D.249,448,320.

How many Earth days does it take Mars to make a trip around the sun?

A.365. B.322. C.687. D.1052.

.On Mars and Earth, which season has the same length?

A.Spring. B.Summer. C.Autumn. D.Winter.

A person feel lighter on Mars than on Earth because           .

A.there is less gravity on Earth
B.there is less gravity on Mars
C.there is more oxygen on Earth
D.there is more oxygen on Mars

The following facts are mentioned to compare Earth to Mars except             .

A.Length of Day B.Numbers of Moons
C.Orbit around the sun D.Size of Earth and Mars
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