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.
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.
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.
一个天文单位就是地球到太阳的距离。
相比之下，地球轨道只是一个天文单位。
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.
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).
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.
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.
HR 8799e十分接近其围绕的恒星，它们之间的距离为14.5个天文单位AU；一个天文单位是指地球到太阳的平均距离。
It sits fairly close to its star, at 14.5 astronomical units AU; one AU is the average distance between Earth and our Sun.
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.
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).
这个行星的乐园存在于一个被其他外星猎人所忽视的恒星周围，虽然它距离地球只有12天文单位（39光年）。
The planetary menagerie exists around a star overlooked by other exoplanet hunters, although it is just 12 parsecs (39 light years) from Earth.
这个行星的乐园存在于一个被其他外星猎人所忽视的恒星周围，虽然它距离地球只有12天文单位（39光年）。
The planetary menagerie exists around a star overlooked by other exoplanet hunters, although it is just 12 parsecs (39 light years) from Earth.
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