Those are just the four big moons of Jupiter, each thousands of kilometers across.

这仅仅是四个较大的木卫，每颗的直径都有数千公里。

A lot of Saturn's moons orbit the planet backwards, retrograde; similar to several moons of Jupiter.

土星的许多卫星与一些木卫一样倒着公转。

27. What have scientists found about Europa, a moon of Jupiter?

问题27. 科学家们发现关于木卫二的什么信息？

17. What have scientists found about Europa, a moon of Jupiter?

科学家在木星的卫星木卫二中发现了什么？

One place scientists are studying very closely is Europa, a moon of Jupiter.

他们正在密切观察的对象之一是欧罗巴，木星的卫星。

Question 17. What have scientists found about Europa, a moon of Jupiter?

关于木星的卫星木卫二科学家们有什么发现？

Many of the irregular, distant moons of Jupiter orbit the planet backwards relative to the others, in what are called retrograde orbits.

许多不规则的、遥远的木卫相对于其他木卫来说会倒着旋转，我们称之为回溯公转。

At least three of the moons of Jupiter, for instance, are thought to have buried oceans under their hard crusts of ice.

例如，木星至少有三颗卫星被认为坚硬的冰壳下藏着海洋。

Question 27. What have scientists found about Europa, a moon of Jupiter?

问题27. 科学家们发现关于木卫二的什么信息？

There are several candidates for environments which could actually support life around our own solar system, including Mars and the moons of Jupiter and Saturn.

太阳系里有几个候选星球，它们的条件基本上可以供养生命，包括火星、木星和土星的卫星。

There, the astronomer Jean Picard devised an impressively complicated method of triangulation involving quadrants, pendulum clocks, zenith sectors, and telescopes for observing the motions of the moons of Jupiter.

在那里，天文学家让·皮卡尔发明了一种极其复杂的三角测绘法，用上了扇形板、摆钟、天顶象限仪和天文望远镜用来观察土星卫星的运动。

They could see active volcanoes on one of the moons of Jupiter.

他们可以在木星的一颗卫星上看到活火山。

The astronomer studied the moons of Jupiter.

1. 天文学家研究了木星的卫星。

Deep asleep? - Orbiting the moons of Jupiter

—在木星的卫星轨道上运行。

One planet scientists are studying very closely is Europa, a moon of Jupiter. Space probes have provided evidence that Europa has a large ocean under its surface.

科学家们正密切关注的地方是木卫二，木星的一个卫星。太空探测器提供了证据表明木卫二表层之下有一个海洋。

And they told me all about the second moon of Jupiter, Europa.

他们告诉我有关木星第二颗卫星欧罗巴的一切。

It happens on Mars, it happened on the moon, it even happens on some of the moons of Jupiter and Uranus.

这种情况在火山、月球甚至某些木星和天王星的卫星上也发生过。

Carbonic acid has been previously detected on other astronomical bodies, including the icy moons of Jupiter, in some meteorites and comets, and even on Mars and Mercury, but until now, has not been seen in interstellar space.

以前曾在其他天体上检测到过碳酸，包括木星的冰卫星、一些陨石和彗星，甚至火星和水星，但直到现在，还没有在星际空间中看到过碳酸。

Then furthermore you may be alive when we send mission to the moon of Jupiter called Europa which has at least twice as much seawater as the earth.

然后，当我们向称为木卫二的木星卫星发送任务时，您可能还活着，那里的海水至少是地球的两倍。

Then there's Titan, Saturn's largest moon, with its thick atmosphere and lakes of methane; and Europa, a moon of Jupiter, which may harbor a subsurface ocean, and with it, the potential for life.

然后是土星最大的卫星泰坦，它有厚厚的大气层和甲烷湖。木星的卫星木卫二可能蕴藏着地下海洋，并蕴藏着生命的潜力。