Hubble
哈勃望远镜帮助发现银河系的恒星晕
哈勃发现星系中的冷气体云
哈勃望远镜观测到星系的自转曲线
哈勃发现宇宙中的金属丰度梯度
哈勃望远镜帮助发现宇宙中的再电离源
哈勃发现星系中的恒星流和潮汐尾
哈勃望远镜观测到恒星诞生后的疏散星团
Hubble Space Telescope captures the stunning final breaths of a dying star
来源： Space.com This Hubble Space Telescope image is not just a beautiful scene, but also a tool scientists can use to study stellar evolution. The Egg Nebula is a pre-planetary nebula — an early form of a planetary nebula, which is a glowing shell of gas and dust shed from a dying sun-like star. And it’s “the first, youngest, and closest pre-planetary nebula ever discovered,” according to NASA. While planetary nebulae don’t have anything to do with planets directly, they do provide the seed material for future star systems that do have planets, much like our own. ...