As of 2007, three extrasolar planets have been confirmed in orbit around this pulsar.

直至2007年，在这颗脉冲星周围轨道上已有三颗系外行星被确认。

youdao

A new survey of the Kuiper belt - the distant area of the solar system beyond the orbit of Neptune - has turned up three new icy worlds that may be dwarf planets like Pluto.

一项对柯伊伯带-太阳系学海王星轨道之外的远距区域的调查，找到了三个新的冰封世界，可能像冥王星那样的矮星。

youdao

Launched in 2004, the spacecraft flew by the planet three times before entering orbit in March of this year, when it sent the first close-up images back to Earth.

航天器于2004年发射，在今年三月进入轨道发回地球第一个特写图像之前，它已飞越水星三次。

youdao

He says there are more than three hundred thousand small objects or pieces of debris in orbit that are larger than one centimeter.

VOA: special.2009.04.01

A chimpanzee named Enos was launched on a three-orbit flight.

VOA: special.2009.06.17

"We will use the tremendous capabilities of this ion propulsion system to climb out of orbit around Vesta, travel for almost another three years through the asteroid belt to dwarf planet Ceres and then go into orbit around Ceres and undertake the same kind of measurements there that we'll be doing at Vesta.

VOA: special.2011.07.27

"We were really happy to take part in delivering Expedition Three to orbit and they're having a great mission right now up there on the space station, " Horowitz told reporters after inspecting Discovery with fellow shuttle crewmembers Rick Sturckow, Dan Barry and Pat Forrester.

CNN: Discovery brings home Alpha crew

The vehicle left the Kourou spaceport in French Guiana at 23:06 local time on Monday (02:06 GMT, Tuesday), placing three satellites in orbit.

BBC: Esa's Vega rocket puts Proba-V vegetation mission in orbit

The visit comes less than a month after North Korea put a satellite into orbit using a three-stage rocket - a move condemned by the US as a banned test of long-range missile technology.

BBC: Google head and former US governor in North Korea visit