Can you throw a baseball really far? I can't.
打棒球的時候，你可以把球投得很遠嗎？我不行。
But, when I spin my arm around and around and then throw a baseball, the ball flies farther.
如果我先旋轉我的手臂，再把球丟出去，球會飛得比較遠。
Spinning around and around gives the ball more energy. This is called "momentum".
這叫做【動力】。
When something has a lot of momentum, it can be thrown really far!
NASA is the American space agency. They want to try using lots of momentum to send rockets to space using no fuel!
現在美國太空總署想要用同樣的原理來發射火箭進入太空！
A machine with an "arm" will hold the rocket and start spinning. It will keep spinning and spinning and spinning, until it gets up to 5,000 kilometers per hour!
Then… whoosh! The arm of the machine will let go! And the rocket will fly straight up from the earth. It will fly up into the sky and all the way into space!
太空總署的發射器有一隻機器手臂，會旋轉火箭，直到它的時速高達五千公里。手臂鬆開之後，火箭就會一飛沖天，一路飛進太空。
It's a really cool idea because it doesn't need any fuel. So it saves money and it doesn't cause any pollution.
這不需要用到燃料，很省錢也不會汙染環境。
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Vocabulary
用甩球的方式把火箭甩進太空，真是神奇！
1. rocket 火箭
How does a spaceship go into space? 太空船是怎麼進太空的？
The rocket pushes it into space. 火箭把它推進太空。
2. throw 扔
Come on, throw the ball to me. 來把球扔給我。
That's too high! 太高了！
Sorry about that. I'll throw better this time. 真抱歉，這次我會投好一點。
3. machine 機器
Name a machine that changed the world. 你說一個改變世界的機器。
An elevator? 升降機如何？
Yeah, without it we wouldn't have tall buildings. 對，沒有它我們就沒有高樓。
4. arm 手臂
That man has robot arms. 那個人有機器手臂。
Wow, he must be very strong! 哇，那他一定很強壯！
And he can get pizza right from the oven. 他也可以直接從烤箱裡拿披薩。
Let's read the words together.
rocket 火箭
throw 扔
machine 機器
arm 手臂
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Quiz
1. How will this new rocket get into space?
A: By spinning really fast on earth and then shooting up into the sky
B: By using a new, super big engine
C: By going underwater and then shooting up in the sky
2. How fast will the machine "arm" spin before letting the rocket go?
A: 5,000 kilometers per hour
B: 50 kilometers per hour
C: 450,000 kilometers per hour
3. What does spinning really fast do?
A: It gives things more energy
B: It makes you happy
C: It makes things go slower
Answers
1. A
2. A
3. A
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