恒星系统

A method to acquire and track the beacon for deep space optical communication system is proposed, which uses star as beacon, and controls the direction of down beam based on the absolute position in inertial frame, the ephemeris of aircraft and earth and the attitude of aircraft.

提出一种深空光通信系统的信标捕获、跟踪方案，该方案是以恒星作为信标，根据恒星在惯性坐标系中的绝对位置信息，基于航天器和地球星历表、航天器的姿态信息来进行下行光束瞄准方向的精确控制。

The possibility that stellar evolution of either Sirius A or Sirius B could be responsible for this discrepancy is rejected by astronomers on the grounds that the timescale of thousands of years is too short and that there is no sign of the nebulosity in the system that would be expected had such a change taken place.

恒星演化的可能性要么是天狼星A要么是天狼星B造成的差异，地球上科学家不认可这种看法，数千年的时间刻度太短，在系统内没有星云状物的迹象，在这系统内认为这可能性会发生的。

For example, since the earth to the base, relative to the sun to measure time to get the sun when the time is measured relative to the stars, known as the sidereal time, to atomic transition frequency as a benchmark time for the system is called atomic time.

例如，以地球自转为基准，相对于太阳来计量时间得到的是太阳时，相对于恒星来计量时间，称为恒星时，以原子的跃迁频率为基准的时间系统称为原子时。

We figure out the telescope mount parameters by observing stars with CCD, and establish a measurement system, including CCD and image acquisition card to collect stars'image data, time and frequency system (made up of high accuracy counter, the GPS second signal and 10MHz frequency standard), the observing software in VC++6.0 for collecting and processing star image and the image processing software programmed with MATLAB.

建立了一套用于测定望远镜机架指向误差模型参数的系统，包括：CCD 及图像卡等硬件系统用于采集恒星图像数据；使用高精度的计数器、GPS 提供的秒信号和标准10MHz信号开发了用于观测软件的时间频率系统；使用VC++6.0 编制了包括用于计算恒星位置及图像采集和处理的观测程序，并用MATLAB编制了用于处理观测数据的程序。

The star lies 300 trillion miles, or about 50 light-years, from Earth; the planetlike object is estimated to be 10 to 40 times the size of Jupiter.

然而，类似系统所绕恒星是巨恒星，质量远远超过太阳。

Eta Carinae is a star system located in Carina, about 7,500 light years away from the sun to 8,000 light years.

船底座伊塔星是位于船底座的恒星系统，距离太阳大约7500光年到8000光年。

We have assumed that each stellar system in evolutions throws off electric corpuscles into space.

&&我们假定每个恒星系统演化过电动抛下体送入太空。

While that might not sound like much, the find suggests that several hundred million star systems look a lot like the one we call home, the study authors say.

虽然这听起来并不多，这一发现表明，数亿元的恒星系统有点像一个我们称之为家的很多研究报告的作者说。

These events include two kinds of stellar explosions:(1) nova explosions, in which one of the two members of a binary star system hurls dust and gas into space;(2) much more violent supernova explosions, in which a star collapses, then throws off most of its matter.

这些事件包括两种类型的恒星爆发：（1）新星爆发，双星系统中的一员将气体和尘埃猛烈抛入太空；（2）更为猛烈的超新星爆发，那是一颗恒星崩溃时几乎把它所有物质都抛出去了。

"The material mix in this belt is most reminiscent of the stuff found in lava flows on Earth," Lisse said. I thought of Mauna Kea material when I first saw the dust composition in this system - it contains raw rock and it's abundant in iron sulfides , which are similar to fool's gold .

& &这个尘埃巨带中的混合物质使人想到地球上熔岩流中发现的物质，&利斯说，&第一次看见这个恒星系统中尘埃的组成成分时，我想起了夏威夷莫纳克亚山上的物质——其中包含原岩，富有含铁硫化物，类似于黄铁矿。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。