Name: 宇宙での海探し｜エコノミスト (The hunt for oceans in space | The Economist)
Uploaded: 2021-01-14T08:10:19.000Z
Duration: 2 min 46 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

様態の副詞

Water is vital to life on Earth and probably to life elsewhere.

This has led astronomers to become interested in oceans.

程度の副詞

And to the discovery that oceans can be very different to those beneath the open skies of Earth.

there was good evidence of liquid oceans.

The first of these oceans to be discovered was within Jupiter's moon Europa.

Though Europa is small, it may boast more liquid water than the Earth.

The ocean could be over 100 kilometers deep.

Heat generated by Jupiter's powerful tides keeps it warm underneath the icy shell.

Europe's Jupiter Icy Moons Explorer mission, or JUICE, will launch in 2022 to study Jupiter and three of its largest moons.

Perhaps one of the most promising oceans for study is on Enceladus, a tiny moon of Saturn.

This is because the ocean does not stay under the ice cap.

Geysers at the moon's south pole shoot ocean water hundreds of kilometers out into space.

Studies by NASA's Cassini probe showed that

the water in these jets contain organic molecules,

There is also evidence of hydrothermal vents at the bottom of the ocean.

This is significant because it is thought that life first arose at hydrothermal vents on Earth.

A spacecraft flying through the jets of Enceladus

could sample the water for traces of complex

biological molecules such as DNA or protein.

There is no guarantee of life in the waters of Enceladus.

Or in any of the solar system's other hidden oceans.

But the possibility that something might be there will drive ambitious explorations for decades to come.