恒星

But radial velocity can detect only the motion of a star towards or away from Earth, and works best when the star's motion along this axis is most pronounced – i.e.

不过视向速度仅能探测到恒星朝向或远离我们的速度，并且在恒星运动沿着一轴线最显著的时候最有效。

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 observation confirmed a decade of speculation that a warp in the young star's dust disk may actually be a second disk inclined to the star.

这项观测确定了10年来的推测学说，即年轻恒星的尘埃盘可能实际上时第二个尘埃盘向恒星一侧倾斜。

Highly energetic X-rays are also detected from the young star, partially absorbed by streams of material flowing from the disk onto the star.

年轻恒星的高能x射线同样被探测到，部分通过从圆盘到恒星的物质流吸收。

On the formation mechanism of brown dwarfs astronomers have different opinions, the more common projectile theory, the former star's light caused by erosion of the nuclear theory of opacity constraints of splitting theory, the original star's disk instability theory.

关于褐矮星形成的机制天文学家们众说纷纭，比较常见的有抛射理论、前恒星核的光致侵蚀理论、不透明度制约的分裂理论、原恒星盘的不稳定性理论等。

As streams of material spiral from the disk onto the star, its mass increases and it brightens and heats up dramatically. The resulting outburst causes temperatures to rise in the star's surrounding disk.

随着物质流从行星盘落向中央恒星，恒星的质量增加并剧烈的变热（重力势能转化为热能——译注），结果产生的爆发导致周围的行星盘变热。

The centrifugal force from that prevents some of the gas from reaching the forming star. Instead, it forms an "accretion disk" around the star. The disk radiates away its energy and cools off.

而离心力阻止一些气体到达正在形成的恒星，相反，他们在恒星周围形成一个&吸积盘&，它向外辐射能量并冷却。

Firstly, we adopt the same parametersthat well fit the Milky Way disk to the M31 disk evolution. We found thatthe obtained gas surface density and star formation rate profiles do notfit the M31's observation. This demonstrates that the star formation history inthe M31 disk may totally different from that in the Milky Way disk.

首先，我们将银河系的化学演化模型应用于M31上，发现银河系的恒星形成速率与气体面密度的关系并不符合M31的观测特征，这说明两者拥有不同的恒星形成历史。

Because no light escapes after the star reaches this infinite density, it is called a black hole.

当恒星的密度达到无穷大时，因为光也逃离不了它，此时的恒星就叫做黑洞。

The two stars are among Hipparcos Catalogue (star number 106829) and ACT Catalogue (AC2000:2588165),respectively.

它们分别是依巴谷恒星(星号106829)和ACT星表恒星(AC2000星号2588165)。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了