行星状星云

Explanation: Appropriately nicknamed "the Skull Nebula", planetary nebula NGC 246 really does surround a dying star some 1,600 light-years away in the constellation Cetus.

解释："骷髅星云"，形容行星状星云NGC 246的一个很合适的绰号，围绕着大约1600光年之外的鲸鱼座座的一颗正在死亡的恒星。

Appropriately nicknamed "the Skull Nebula", planetary nebula NGC 246 really does surround a dying star some 1,600 light-years away in the constellation Cetus.

位在鲸鱼座离我们约1，600光年远的行星状星云NGC 246，有个骷髅星云的贴切昵称，因为它中心的确有一颗滨临死亡的恒星。

The left over cosmic debris is steadily being consumed by a black hole with a billion times the mass of the Sun which lies at the center of Centaurus A.

这个行星状星云被认为是一颗类似太阳的恒星正处于生命的最后阶段。最近，许多行星状星云被发现也具有这样的光晕，可能是在恒星演变早期由内部抛出的物质形成。

Planetary nebulae are a type of isolated gaseous nebulae possessing a fair degree of bilateral symmetry.

行星状星云是一类孤立的气体星云，具有相当程度的双侧对称性。

The Bug Nebula, NGC 6302, is one of the brightest and most extremeplanetary nebulae known.

NGC 6302俗称蝴蝶星云，是最著名和最亮的行星状星云之一。

At 650 light-years away, the Helix is one of the nearest planetary nebulae to Earth.

螺旋星云位於宝瓶座，是一个很受欢迎的行星状星云，用双筒望远镜也可以看到。

Explanation: This gorgeous celestial vista is centered on one of the Milky Way's own planetary nebulae, M57, the famous Ring Nebula.

说明：这幅美丽的天文景观，主角是我们银河系的著名行星状星云M57；别名为环状星云。

Explanation: At the center of this sharp skyscape, Centaurus A seems to be a fantastic jumble of old yellow stars, young blue star clusters, and imposing dark dust lanes.

说明：猫眼星云是（NGC6543）天空中最著名的行星状星云之一。这张令人印象深刻的广角影像的较亮中心区域中，我们能看到更为熟悉的星云外层轮廓。

In fact, 21st century astronomers would classify it as a Planetary Nebula, but it's not a planet either, even though it may appear round and planet-like in a small telescope.

事实上，21世纪的天文学家将该天体归类为行星状星云，但是它也不是一颗行星，尽管通过小型望远镜看，它的外观可能呈圆形、类行星状。

Well, 20th century astronomers would classify it as a Planetary Nebula ... but it's not a planet either, even though it may appear round and planet-like in a small telescope.

在21世纪，天文学家会将它分类为行星状星云，但是实际上它也不是行星，只是用小型的望远镜观测时，它具有行星的圆盘状外观而已。

Means the parent directory, so this command means to execute "toolchain.sh," which is in the current directory.

代表父目录，所以这个命令就是执行当前目录下的"toolchain.sh"。

Yes,In fact,I'm on our city ream.

是的。事实上我是我们市队的。