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Matt, you asked the question, can we go skateboarding on the moon or Mars?
马特，你问了一个问题，我们能不能在月球或火星上玩滑板？
Or would this be more of a hoverboard scenario.
或者这更像是一个悬浮滑板的场景。
Well, both the moon and Mars have a weaker surface gravity than the Earth does,
月球和火星的表面引力都比地球小，
so you don't weigh as much on the moon or Mars as you do here.
所以你在月球或火星上的体重不像在这里那么重。
But there still is enough gravity to stick you to the surface,
但是仍然有足够的重力把你留在地面，
so I think you could actually stay on your board and keep it down.
所以我认为你可以留在你的滑板上，放低身位。
You probably wouldn't accelerate as fast as you do here on Earth,
你可能不会像在地球上那样加速，
so, for example, on earth you'd be going down a hill picking up speed.
举个例子，在地球上下山的时候速度会加快。
On the Moon and Mars, the gravity is weaker, so you wouldn't be picking up as much speed.
在月球和火星上，引力较小，所以你速度不会那么快。
So, in fact, skateboarding might be a little bit dull on the moon and Mars.
所以，事实上，在月球和火星上玩滑板可能有点枯燥。
The good thing is that if you fall over, you also don't fall with the same force you would from the gravity of the Earth.
幸运的是，如果你摔倒了，你也不会像在地球那样摔倒。
So you'd probably be a bit safer.
所以在那里摔倒会更加安全一点。
But the question actually kind of has got me thinking about
但是这个问题让我开始想，
what sort of sports you could do on some of the worlds in our solar system that you just could not do here at all.
在我们太阳系的一些星球上你能做什么在地球上你根本不能做运动。
And there are several places in the solar system that have relatively low surface gravity.
太阳系中有几个地方的表面重力相对较低。
The gravity isn't as strong as here on the surface of the Earth, but they have thick atmospheres.
重力没有地球表面那么强，但它们有厚厚的大气层。
There's a moon called Titan that orbits Saturn, and Titan's a really big object.
泰坦星是环绕土星运行的一颗行星，泰坦星是一个很大的卫星。
I mean, physically, it's actually not that much smaller than the planet Mars.
我的意思是，在体型上，它实际上并不比火星小多少。
Titan's gravity isn't as strong as Earth's, but the atmosphere is actually thicker.
泰坦星的引力不像地球那么强，但它的大气层实际上更厚。
There's actually a little more air pressure on Titan than there is here on Earth.
实际上，泰坦星上的气压比地球上的稍高。
It's a very different sort of air. There's no oxygen. It's actually mostly nitrogen, a little bit of carbon dioxide.
那是一种完全不同的空气。那里没有氧气。实际上大部分是氮气，还有一点二氧化碳。
So you couldn't breathe. You'd have to bring a breathing apparatus.
所以你不能呼吸。你得带上呼吸器。
It's also very cold. It's about 300 degrees below zero.
那里也非常冷。温度大概在300度。
But if you had a really super-duper parka and you had a breathing apparatus, you could actually survive on the surface of Titan.
但是如果你有一个非常厉害的大衣和一个呼吸器，你就可以在泰坦星上生存下来。
There's air pressure. With air pressure and low gravity, you could actually strap large wings to your arms.
那里有气压。有了气压和低重力，你可以把大翅膀绑在手臂上。
I mean, imagine wings made of some wonderful, flexible metal, maybe like titanium.
我的意思是，想象一下翅膀是由一些奇妙的、有弹性的金属做成的，比如钛。
And if you jumped off a cliff, you could fly. You could actually start flapping your wings and actually getting lift.
如果你从一个悬崖上面跳下来，你就可以飞翔。实际上你可以开始扇动你的翅膀，升起来。
And you could fly, just yourself, jumping off a cliff on Titan, and flying around in that thicker atmosphere.
你就可以飞翔啦，就你自己，从泰坦星上面一个悬崖上跳下来，在那更厚的大气层里面飞来飞去。
And there are other places where you have relatively low gravity but giant cliffs.
还有一些地方重力相对较低，但有巨大的悬崖。
For example, there's a moon of Uranus called Miranda, and Miranda has cliffs that are many miles high.
比如说，有一个天王星的卫星叫米兰达星，米兰达星有很多数英里高的悬崖。
So, you could jump off a cliff and fall very slowly and very gently down to the bottom.
所以，你可以从悬崖上跳下来，然后慢慢地轻轻地落下来。
If you think about the idea of feather falling.
就像是羽毛飘落下来的感觉。
That's something from Dungeons and Dragons, you can fall very carefully and not actually hurt yourself.
这是来自龙与地下城的东西，你可以非常小心地摔下来而不会受伤。
There might be sport on Miranda like skydiving, but you don't need a parachute. You just float down very gently and land.
米兰达星球上可能有跳伞之类的运动，但你不需要降落伞。你只需非常轻柔地往下漂浮，然后着陆。
