Mars orbits the Sun in 687 days, which means 1 Earth year on Mars is 687 days.

火星绕太阳公转的周期是687天，这意味着火星上的1个地球年是687天。

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The craft, known as MESSENGER, began the orbit around 9:00 p.m. (0200 GMT) on a mission to circle the planet for one Earth year in an unprecedented study of the tiny, hot planet.

名为“信使”号的该航天器于晚上9点(格林威治标准时间凌晨2点)进入水星轨道，并在此后为期1地球年的时间内，环绕这个细小炎热行星进行史上第一次的研究。

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Changes in eccentricity, tilt and wobble do not affect the total amount of solar radiation Earth receives in a year.

离心率、倾斜和摆动的变化并不影响地球一年接收到的太阳辐射总量。

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In May, a thirteen-year-old American boy became the youngest person to climb the tallest mountain on Earth.

VOA: special.2010.06.30

Susan Bass says that this year's Earth Day will be a busy one in the United States.

VOA: special.2010.04.21

The number of man-made objects in Earth orbit has been growing each year.

VOA: special.2009.04.01

Umicore is the most sustainable company on earth this year, according to a new ranking.

FORBES: The World's Most Sustainable Companies

Millions of people around the world take part in Earth Hour year on year and we're always looking for innovative ways to get our message out there.

ENGADGET: Quadrocopter fleet stuns Londoners with giant hovering Star Trek logo (video)

The asteroid orbits the Sun in 368 days - a period similar to Earth's year - but it does not orbit in the same plane as the Earth.

BBC: Asteroid 2012 DA14 in record-breaking Earth pass