So, by not collapsing into denser regions, these massive nebulae, like the 100,000 solar mass California Nebula shown above, don't necessarily start making baby stars and planets.
所以如果不被压缩到很致密，这些大质量星云，比如有太阳质量100，000倍的California星云，则不一定会形成新生恒星和行星。
L the Ring nebula in Lyra is the best-known of the planetary nebulae.
l天琴座中的环状星云是最著名的行星状星云。
The Cat's Eye nebula (NGC 6543) is one of the best known planetary nebulae in the sky.
猫眼星云(NGC 6453)是天空中最著名的行星状星云之一。
Unlike reflection nebulae like DG 129, which reflects light from nearby stars, this nebula emits light from hot ionized gas that glows as it cools.
反射星云DG 129反射的是临近恒星的光芒，而照片中的星云光芒则是由于其中炙热的电离气体变冷时发出的。
When you look up into the heavens with a telescope, you see many nebulae whelloch are like, or approximately like, the perfectly balanced spiral nebula whelloch you see edgewise in Fig. 23.
当你用千里镜不雅测天空，你瞥见很多与图示23中边沿朝前的完善平衡的螺旋星云相仿或大致相是的星云。
Some nebulae are made up of both reflection and emission components such as the Trifid Nebula.
有些星云是由反射星云和发射星云结合在一起的，例如三裂星云。
Starting on the left, look for the Lagoon and Trifid nebulae, the Cat's Paw, the Pipe dark nebula, and the colorful clouds of Rho Ophiuchi and Antares (right).
从影像左方开始往右，分别可以找到潟湖星云、三裂星云、猫掌星云、烟斗星云以及色彩缤纷的心宿增四星和心宿二。
Starting on the left, look for the Lagoon and Trifid nebulae, the Cat's Paw, the Pipe dark nebula, and the colorful clouds of Rho Ophiuchi and Antares (right).
从影像左方开始往右，分别可以找到潟湖星云、三裂星云、猫掌星云、烟斗星云以及色彩缤纷的心宿增四星和心宿二。
应用推荐