They could compare it with images taken by Earth-based telescopes.

VOA: special.2009.09.30

Why should the amount by which you're attracted to the Earth be also a measure of how much you hate acceleration?

为什么物体受地球引力的大小,恰好能衡量物体加速的难易程度呢

耶鲁公开课 - 基础物理课程节选

You konw, the earth is gonna be burnt up by the sun one of these thousands of years.

在未来几千年中的某一年,地球会被太阳燃成灰烬。

麻省理工公开课 - 电影哲学课程节选

Newton proved his idea by measuring how much gravity force would be needed to keep the moon orbiting the Earth.

VOA: special.2011.06.01

So he decides to destroy the gods - and he is thwarted by a water god named Ea, an earth-water god- En sorry, he's a combination earth-water god--named Ea.

于是他便决定摧毁神灵,但他被一个叫做En的水神阻止，他是一个土神，不，水神-,对不起，他是水神和土神的合体，名叫。

耶鲁公开课 - 旧约导论课程节选

It has high mountains. It has valleys formed by ancient ice that cut deep into the Earth millions of years ago.

VOA: special.2009.01.07

So, when you divide by m, m cancels and everything falls at the same rate on the surface of the Earth.

因此,当等号两边除以 m 时,m 被消去了,在地球表面的所有物体,都以相同的加速度下落

耶鲁公开课 - 基础物理课程节选

The first pictures of Earth taken from space showed a solid ball covered by brown and green landmasses and blue-green oceans.

VOA: special.2011.01.04

The ground still shows the path cut deep into the earth by the wheels of thousands of wagons.

VOA: special.2009.03.30

Muse Opiang studied how echidnas eat, by digging in the earth with their long noses to find worms.

VOA: special.2009.07.07

The total energy reaching Earth from the sun rises and falls by just one tenth of one percent across this solar cycle.

VOA: special.2009.09.29

She said the discovery "supports the theory that some of life's ingredients formed in space and were delivered to Earth long ago by meteorite and comet impacts."

VOA: special.2009.09.30

The last one,by astronaut Gordon Cooper, circled the Earth twenty-one times.

VOA: special.2009.06.17

On Earth,it is mainly produced by processes linked to biology.

VOA: special.2009.12.30

Gillian wrote a report of how he spent the thousand dollars: "Paid by Robert Gillian, one thousand dollars on account of the eternal happiness, owed by Heaven to the best and dearest woman on earth."

VOA: special.2011.08.13

As we approached the mountain, the hills and gulleys bore the appearance of having been created by some vast, fierce torrent rushing around the base of the peak, and tearing its way through the loose earth....

VOA: special.2010.04.26

It is rather for us to be here dedicated to the great task remaining before us that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion that we here highly resolve that these dead shall not have died in vain that this nation,under God, shall have a new birth of freedom and that government of the people, by the people,for the people, shall not perish from the earth."

VOA: special.2009.11.12

The ONLF accused the troops of conducting a 'scorched earth' campaign, a claim that was strongly denied by the government.

VOA: standard.2009.11.16

The accomplishment was soon followed by cosmonaut Yuri Gagarin's historic manned spaceflight into Earth's orbit in 1961.

VOA: standard.2009.07.16

Television and radio transmitters on Earth may soon go dark, replaced by cable,fiber,satellites, and the Internet.

VOA: standard.2010.04.16

Astronauts began their first full day in space by inspecting the heat shield to ensure the shuttle is safe to return to Earth in two weeks.

VOA: standard.2009.07.16

Both Melvin and Satcher say they hope there will be many more African-American space explorers inspired by what they've accomplished, not only in outer space but on Earth.

VOA: standard.2010.02.02