天文单位

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.

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。

An astronomical unit is the length of the semimajor axis of the orbit of a hypothetical planet of mass 1/354710sm and period 365.2563835 msd in elliptic motion about the Sun; that is

天文单位的定义改为：当公转周期为365.2568983263历书日时，一个假想的、质量为零的无摄动行星的椭圆轨道的半长径，等于一个天文单位。

In 1976, the International Astronomical Union revised the definition of the AU for greater precision, defining it as that length for which the Gaussian gravitational constant takes the value 0.01720209895 when the units of measurement are the astronomical units of length, mass and time.

但实际上地球绕日的轨道不是一个圆形，而是一个椭圆形：最初天文单位的定义就是上述椭圆的半长轴的长度。1976年，国际天文学联会把一天文单位定义为一颗质量可忽略、公转轨道不受干扰而且公转周期为365.2568983日的粒子与一个质量相等约一个太阳的物体的距离。

Such a mission would probably need to surpass 200AU from the Sun in a hyperbolic escape orbit.

这样的一个探测器可能需要沿双曲逃逸轨道在距太阳 200天文单位处越过。

The crafts destination is Tridesa, a Jovian class planet approximately 18 AUs from Delta.

此次飞行的目的是 Tridesa，一颗离德尔萨大约18个天文单位距离的木星群行星。

One astronomical unit equals the distance from the earth to the sun .

一天文单位等于从地球到太阳的距离。

Weighing in at nearly 10 Jupiter masses, the planet circles at a distance of .04 Astronomical Units from its host star, TW Hydrae, in the constellation Hydra.

该行星质量相当于近10颗木星，在0.04天文单位处围绕其主恒星旋转。这颗主恒星叫做& TW 海德里&，位于长蛇座。

The dotted lines show the angular displacement from the Sun. Units are in A.U.

虚线显示了它们与太阳的角位移，单位是天文单位。

Know astronomical unit and light year are used for expressing the distance between celestial bodies.

知道天文单位和光年是用来丈量天体之间距离的单位。

The inner asteroid belt looks identical to ours in terms of material, and it orbits at 3 astronomical units from Epsilon Eridani — the same distance between the sun and the rocky asteroid belt between Mars and Jupiter. An astronomical unit equals the average Earth-sun distance of 93 million miles, or about 150 million km.

内围小行星带中的物质看起来跟我们太阳系的小行星带一模一样，在3天文单位的距离上环绕着恒星& E 波江&——这个距离跟火星和木星之间的小行星带到太阳的距离也一样。1天文单位等于地球跟太阳之间的平均距离，相当于9，300万英里，或者15，000万公里。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。