这个距离被称为“天文单位”或AU。
哈雷知道，天文单位是所有天文学测量中最基本的。
Halley was aware that the AU was one of the most fundamental of all astronomical measurements.
天文单位是宇宙的标尺，是我们今天测量宇宙的基础。
The AU is a cosmic measuring rod, and the basis of how we scale the Universe today.
柏林天文台主任约翰·弗朗茨·恩克最终根据所有这些视差测量结果确定了天文单位的一个值为153,340,000公里。
Johann Franz Encke, Director of the Berlin Observatory, finally determined a value for the AU based on all these parallax measurements: 153,340,000 km.
地球也是一个，因为我们用天文单位。
For the Earth, it is one because we work in astronomical units.
一个天文单位是地球与太阳之间的距离。
An astronomical unit is the distance between Earth and our sun.
相比之下，地球轨道只是一个天文单位。
一个天文单位等于地球到太阳之间的距离。
One astronomical unit is the distance between the Earth and the sun.
一个天文单位就是地球到太阳的距离。
一天文单位等于从地球到太阳的距离。
One astronomical unit equals the distance from the earth to the sun.
太阳到地球的距离即为一个天文单位。
The distance from the sun to earth is one astronomical unit.
它可能会在距离太阳3万个天文单位的地方被发现。
It could be found up to 30,000 astronomical units from the sun.
光年是一个天文单位。
一个天文单位是地球到太阳之间的距离，大约9300万英里。
One AU is the distance between the Earth and the sun, about 93 million miles.
知道天文单位和光年是用来丈量天体之间距离的单位。
Know astronomical unit and light year are used for expressing the distance between celestial bodies.
他们发现围绕星体的碟状物质直径大约130天文单位(120亿英里)。
They found the star to be surrounded by a so-called circumstellar disk measuring some 130 astronomical units (12 billion miles) across.
一个天文单位是地球与太阳的距离，大约9300万英里(1.5亿公里)。
One astronomical unit is the distance between the Earth and the sun, about 93 million miles (150 million km).
第二个行星带距离它的恒星为20个天文单位，这相当于太阳系中天王星的位置。
The second asteroid belt lies at about 20 astronomical units from the star, or a position comparable to Uranus in our solar system.
玛提斯认为“复仇者”距太阳有25000个天文单位(或者说三分之一光年)。
Matese estimates Nemesis is 25,000 AU away (or about one-third of a light year).
玛提斯认为“复仇者”距太阳有25000个天文单位(或者说三分之一光年)。
Matese estimates Nemesis is 25, 000 AU away (or about one-third of a light year).
据估计，奥尔特云的边界应在50,000天文单位外，因此该天体依然位于奥尔特云内。
This is still well within the Oort cloud, whose boundary is estimated to be beyond 50,000 AU.
一个天文单位等于地球轨道的平均半径，大约是93，000，000英里。
One astronomical unit is equal to the average radius of the Earth's orBit, aBout 93, 000, 000 miles.
内侧行星带距离它的恒星为3个天文单位——或者相当于太阳系中的行星带与太阳的距离。
The inner belt orbits at a distance of about 3 astronomical units from its star — or about the same position as the asteroid belt in our own solar system.
但现在晶体在两个天文单位外被探测到，它沿一条陡峭的绝非自然形成的轨道精确地飞向地球。
But now, the crystalloid has been detected two astronomical unit distances away from earth, and it is flying to the earth accurately with its precipitous unnatural orbit.
大多数行星形成模型预言在主恒星一个天文单位（或从地球到太阳的平均距离）以内会有一个“沙漠之星”。
Most planet-formation models predict a “planet desert” within one astronomical unit (or the average distance from the Earth to the sun) of a host star.
较早的红外天文卫星(IRAS)的一次失败搜寻显示，5倍木星质量天体的距离必须大于10,000天文单位。
A failed search of older IRAS data suggests that an object of 5 MJ would need to have a distance greater than 10,000 AU.
它每4.7天环绕恒星一周，其轨道为一个适度的椭圆，平均距离仅0.04个天文单位(为水星距太阳的十分之一)。
It orbits its star every 4.7 days, in a moderately elliptical orbit at a mean distance of only 0.04 AU (one tenth of Mercury's distance from the sun).
它每4.7天环绕恒星一周，其轨道为一个适度的椭圆，平均距离仅0.04个天文单位(为水星距太阳的十分之一)。
It orbits its star every 4.7 days, in a moderately elliptical orbit at a mean distance of only 0.04 AU (one tenth of Mercury's distance from the sun).
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