I am a gas giant all astronomers claim.

所有的天文学家都说我是一个巨大的气体。

I am a gas giant, and an impressive sphere.

我是一个气体巨人，非常令人印象深刻的球体。

Astronomers now know that gas giants are common around other stars.

天文学家现在知道，气体巨星在其他恒星周围很常见。

It's a gas giant, which means it's gassy, and… giant.

它是气态巨星，即充满气体并且巨大。

It is a gas giant orbiting an unusually far away young star.

它是一颗气态巨星，围绕着异常遥远的一颗年轻恒星运行。

For example. take the case of gas giants like Saturn and Jupiter.

以土星和木星这样的气体巨星为例。

Saturn is a gas giant, which means it has a thick atmosphere.

土星是一个巨大的气态行星，这意味着它有一个厚厚的大气层。

But like gas giant neighbour Jupiter, it's a triumph of show over substance.

但就像巨大的气体邻居木星一样, 这是一种物质胜利的展现。

4 times wider than Earth is Neptune, a cold blue gas giant 49,500 km wide.

海王星的宽度是地球的4倍，它是一颗蓝色的冷气体巨行星，宽度为49500公里。

It's the biggest planet in our solar system, a gas giant.

它是我们太阳系中最大的气态行星。

To distinguish it from the gas giants Jupiter and Saturn, Uranus is called an “ice giant.”

为了与气态巨行星木星和土星区分开来，天王星被称为“冰巨星”。

That's where it flies close enough to the gas giant to receive a gravitational slingshot effect.

这就是它跟巨大气体行星飞的足够近的地方，为了受到引力弹弓效应。

Such skewed orbits are common for so-called hot Jupiters—gas giants that orbit close to their hosts.

这种歪斜轨道在所谓“热木星”——近距离围绕恒星运行的气态巨星——中很常见。

Planets, even gas giants like Jupiter, are far too small to generate fusion.

行星，甚至是像木星这样的气态巨行星，都太小而无法产生聚变。

NASA first sent probes in part to get a closer look in 1977. Jupiter is a gas giant.

1977年，美国国家航空航天局第一次成功发射探测器，旨在实现近距离观察。木星是一颗气体巨星。

No other satellite has flown so close to the gas giant during the main phase of its mission.

此前人造卫星从未在任务主要阶段如此接近过这个气体巨星。

Since the planet is a gas giant, storm clouds and strong winds occur there almost every second, provoking thunderstorms.

由于地球是一颗巨大的气体行星，那里几乎每秒钟都会出现暴风云和强风，引发雷暴。

Rocky planets formed closer to the Sun, and larger gas giants farther out.

岩石质的行星在靠近太阳的地方形成，更大的气体巨行星在更远处形成。

And what can that tell us about our own planet's chances of surviving a crash into the gas giant?

这对我们的星球在撞上这颗气态巨星后的生存机会有何启示？

Most of the worlds we've encountered are either ice giants like Neptune, or gas giants like Jupiter and Saturn.

我们发现的多数星球要么是像海王星一样的冰巨星，要么是像木星和土星这样的气态巨星。