cosmicfunnies: Starry Greetings! Planet X is hosting a summer…

cosmicfunnies:

Starry Greetings!

Planet X is hosting a summer class! (You’ll see more of him in September)

This week’s topic: Pulsars

https://www.space.com/32661-pulsars.html

https://www.universetoday.com/25376/pulsars/