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Uranus
Neptune
drive 60 mph in a car----270 years
the fastest spaceship----4 months
Earth is bigger.
Earth is heavier.
Mars is warmer.
Humans jump higher on Mars.
There is breathable air on Mars.
1℃= 33.8 ℉
Mars takes its name from the Roman god of war because of its blood-red color.
Mars is home to the tallest mountain in the solar system.
Olympus Mons
It has a height of 22 km, 3 times as tall as the Himalayas.
Days on Mars are 40 minutes longer. Its length of year is 687 days.
Talk in pairs
Earth has a __________ atmosphere of gases that surrounds it. The gases stay around Earth because of __________. The atmosphere helps human beings live because it has ___________that humans need to breathe in.
The atmosphere around Earth also keeps humans safe from the amount of _________ __________ that comes from the sun.
On Mars, its atmosphere is too __________ to keep out ultraviolet radiation. Therefore, humans would die of cancer easily.
On Mars, instead of oxygen, it has mostly a poisonous gas called __________ ________ that we can’t breathe in.
gravity
oxygen
ultraviolet
radiation
thin
carbon dioxide
thick
Earth has a __________ climate. The temperature on Earth does not go from one ____________ to the other.
Earth is just the right ___________ from the sun so it receives the right amount of _________ and _______ to support life.
distance