The future of the Sun. According to what I’ve read, the sun is barely massive enough to create a visible planetary nebula when it dies. Here, I’ve drawn our sun in death. At that time, our galaxy will have merged with the Andromeda galaxy, and the sun’s core will be just hot enough to ionize the layers blown off during thermal pulsing.
I’ve imagined the sun’s planetary nebula would be red because of this.
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