在数十亿年的时间里，这些气体被引力压缩成星系、恒星、植物，最终甚至变成了人类。
Over billions of years, the gas was compressed by gravity into galaxies, stars, plants and eventually, even humans.
只要恰当地控制粒子束的照射时间，该恒星将有效地成为一台调频电台——以“造父变星”的脉冲为基础载波向宇宙广播。
Time the beam right and the star could be turned, in effect, into an FM transmitter-broadcasting to the universe on the underlying carrier-wave of the Cepheid's pulsation.
人们知道行星会随着时间的推移向着或者背离其恒星迁移，但人们对其过程知之甚少。
Planets are known to migrate toward or away from their stars over time, but the process is poorly understood.
虽然这些恒星只有五十万年——按照恒星的时间尺度计算，它们还处于婴儿期——但是大都已经失去了其形成行星的由气体与尘埃组成的圆盘。
Although the stars were just half a million years old-still in their infancy in stellar time scales-most had already lost their planet-forming disks of gas and dust.
他们中的许多相信随着时间的流逝，物质逐渐冷却，更多种类的原子开始形成，然后这些原子最终凝聚成了现在宇宙中的恒星和星系。
Many believe that as time passed and matter cooled, more diverse kinds of atoms began to form, and they eventually condensed into the stars and galaxies of our present universe.
昴宿星团是个开放性的星团，这意味着虽然它内部的恒星目前松散地聚在一起，但是在未来数百万年的时间内，每颗恒星最终依照自己的轨道运行。
The Pleiades is an open star cluster, which means that while its stars are bound loosely together right now, each star will eventually go its own way within a few hundred million years.
在有大质量物体存在时，例如恒星，空间-时间会被扭曲或弯曲。
Space-time can be distorted or curved by the presence of massive objects, such as stars.
它们每次经过恒星面前的时间，分别大约是19.24天和38.91天，但这个时间间隔有一定的变动范围，里层行星在4分钟范围内，外层行星在39分钟范围内。
They cross in front of their star about once every 19.24 and 38.91 days, but those times can vary by up to 4 minutes for the inner planet and 39 minutes for the outer one.
几乎每隔一段时间，由于受银河系本身及经过的恒星的影响，该星云就会朝太阳方向照亮夜空的彗星。
Every so often, a passing star or the tidal effect of the Milky Way itself jostles the cloud, sending some of the chunks sunward to light up the night sky as comets.
而长时间曝光也拍出了红色发射星云、恒星形成区ic 405、IC 410和IC 417。
But the deep exposure also brings out the reddish emission nebulae of star-forming regions IC 405, IC 410, and IC 417.
“最大的恒星寿命仅为3百万年，这在天文学中是个很短的时间。”克洛泽说。
"The biggest live only 3 million years," Crowther said. "In astronomy that's a very short time."
炽热的恒星内核会在几十亿年里逐渐冷却，内核在这段时间里叫做白矮星。
The hot, remnant stellar core of NGC 2818 will eventually cool off for billions of years as a White Dwarf.
因此我认为我们可以做到在远小于2000年的时间内抵达最近的恒星。
So, I think we'll be able to do to a lot better than 2,000 years to the nearest star.
这颗行星距离地球有1,400光年之远，它围绕恒星高速公转一周只需三天半的时间。
The planet is located about 1, 400 light years away from Earth and zips around its parent star in only three and a half day.
在星际的时间尺度上重复发生星系碰撞将最终导致它们融合为一个恒星星系。
Repeated galaxy encounters on a cosmic timescale can ultimately result in a merger into a single galaxy of stars.
随着时间的流逝，锥状星云中最密集的区域会残留下来，也许会形成新的恒星和行星。
Over time, only the densest regions of the Cone will be left. Inside these regions, stars and planets may form.
自诞生以来，这个无垠的星系——它的无数颗恒星后来为地球创造了生命——没有浪费任何时间。
The mighty galaxy whose countless stars would later make life possible on Earth didn't waste any time being born.
只有时间才能揭开真相，但无论如何这颗恒星的距离很可能就意味着它无法成为伊卡洛斯计划的核心研究对象。
Only time will tell, but in any case the distance of this star probably means it's only marginally interesting for Icarus.
这些古老的恒星居于向银河系圆盘上下延伸的恒星晕之中，它们形成的时间很早，早在有机会产生重元素的前几代恒星形成之前。
Residing in the stellar halo extending above and below the galaxy's disk, these stars are so old that they formed before earlier generations of stars had much of a chance to produce heavy elements.
有一些不同种类的恒星爆炸可以产生超新星——短时间的，异常明亮的恒星爆炸事件。
There are a number of kinds of stellar explosions that can produce supernovae — which are short-lived, extra bright stellar events.
这些超星团是许多耀眼夺目、质量硕大的恒星组合体。 其间的每颗恒星诞生的时间都是相同的。
These are collections of hundreds of bright, massive stars, all of which were born at the same time.
最终的结果是，这颗恒星会在不同的时间闪烁。
Net result is that this star would then be flashing with a varying period.
就它们与恒星的距离而言，其石质行星核恐怕需要极其长的成型时间，以至于在星核能够俘获气体前周围的气态盘恐怕就已经消散殆尽了。
At their distances from the star, the rocky planetary core would have taken so long to form that the gaseous disk would have dissipated before the core could attract the gas.
因为它亮度很低，是“不成功”的恒星——褐矮星中温度很低的一种，天文学家花了很长时间才找到它。
It took so long to find because it's an extremely dim and cool kind of failed star called a brown dwarf.
这颗行星围绕着一颗名为“格里斯876”的恒星运转，该恒星距地球15光年，绕轨道运行一周的时间约为地球上的1.94天。
It is orbiting a star called Gliese 876, 15 light years from Earth, with an orbit time of just 1.94 Earth days.
据英国《每日电讯报》日前报道，科学家宣称，在今年晚些时候，当夜空中最明亮的一颗恒星爆炸时，地球将会发现自己要与这“第二个太阳”共处长达几个星期的时间。
The Earth could find itself with a 'second sun' for a period of weeks later this year when one of the night sky's most luminous stars explodes, scientists have claimed.
其中一些恒星仅需几年时间就能完成一周的运行。
在伍斯利看来，这颗巨大恒星的核心塌缩形成了一个黑洞，恒星的外层用了几天时间坠入黑洞并发出辐射，这就是我们观测到的这次爆炸持续时间超长的原因。
This image may support the idea that the fireworks come from a star that fell into a supermassive black hole at the core of the galaxy. a.
在伍斯利看来，这颗巨大恒星的核心塌缩形成了一个黑洞，恒星的外层用了几天时间坠入黑洞并发出辐射，这就是我们观测到的这次爆炸持续时间超长的原因。
This image may support the idea that the fireworks come from a star that fell into a supermassive black hole at the core of the galaxy. a.
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