D

　　(2016·太原二模)Washington: NASA has announced evidence that Jupiter's largest moon, Ganymede, has a saltwater ocean under its icy surface. The ocean seems to have more water than all the water on Earth's surface, according to new Hubble observations.

　　New Hubble observations of Ganymede's magnetic field strongly suggest that the moon, which is the largest in our whole solar system, is home to a subsurface ocean.

　　Scientists estimate that the oceanis 95 kilometres thick, which is about 10 times deeper than Earth's oceans. But unlike our salty waters, Ganymede's ocean is buried under 150 kilometres of ice.

　　While scientists have speculated (推测) since the 1970s about the presence of an ocean on Ganymede — the largest moon in our solar system — until now the only observational evidence came from a brief flyby by the Galileo spacecraft, which didn't observe the moon long enough to confirm a liquid ocean.

　　This discovery marks an important milestone, highlighting what only Hubble can accomplish. In its 25 years in orbit, Hubble has made many scientific discoveries in our own solar system. A deep ocean under the icy surface of Ganymede opens up further exciting possibilities for life beyond Earth.

　　Scientists_have_already_confirmed_the_existence_of_an_ocean_on_Europa,_another moon orbiting Jupiter, and NASA has announced plans to send an unmanned mission there searching for the life that might come with liquid water.

【2017届高考英语一轮复习必备单词素材：Unit 7 The Sea（北师大版）】相关文章：

★ 【北京专用】2014届高考英语一轮复习方案课时作业：必修5 Unit 1 Great scientists

★ 四川省2016届高考英语一轮复习课时作业（41） Module 5 Ethnic Culture 外研版选修8

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (75)

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修6 unit3《A healthy life》

★ 2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单：模块7 unit 4《Public transport》

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练：第12组（含解析）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：模式2 多一词（含解析）

★ 2017高考四川省广安市英语阅读理解一轮系列训练：17（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (70)

★ （安徽专用）2014届高考英语一轮复习方案 作业手册（6）模块2 《Unit 6 Design》（含解析） 北师大版必修1