planetary nebula,

p>环状星云(planetary nebulae,也被称之为"messier 57,意为 a
p>环状星云(planetary nebulae,也被称之为"messier 57,意为 a
shapley an annular planetary nebula
p>行星状星云(planetary nebula,实质上是一些垂死的 a target"
星系:planetary nebula ngc 2371 中间那颗粉色的可爱星星,就是这