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It wiiiisill become more and
more and .
crowded
polluted
What shall we do
Where shall we live
Maybe people will be able to travel in space(太空)and live on other planets(行星) .
The sun is a star(恒星).
The earth is one of the planets(行星)
Mars火星
nine planets
the solar system
People are thinking about living on
Mars
Mars
Do you know anything about Mars?
It looks red. So it is also called the Red Planet.
Do you know why we call it Mars?
The surface(表面) of Mars
火星(Mars)是太阳系八大行星之一,是 太阳系由内往外数的第四颗行星,直径约为地球的一半,自转轴倾角、自转周期均与地球相近,公转一周约为地球公转时间的两倍。橘红色外表是因为地表的赤铁矿(氧化铁)。
火星基本上是沙漠行星,地表沙丘、砾石遍布没有稳定的液态水体。二氧化碳为主的大气既稀薄又寒冷,沙尘悬浮其中,每年常有尘暴发生。
火星有两个天然卫星:火卫一和火卫二,形状不规则,可能是捕获的小行星。
2013年12月公布的探测资料表明,火星上存在已干涸远古湖泊,或有生命出现证据。
Why do we choose to move to Mars?
The surface of Mars is more similar to the surface of the Earth than any other planet in our solar system.
What do we need or have?
What do we need in space?
Can provide oxygen
tent
It’s not necessary to take a tent to sleep in space as there is no rain or wind in space.