Crash Course Astronomy: Nebulae

It's kinda weird to think that out in space there are gigantic clouds of gas and dust, hundreds of trillions of kilometers across, but as tenuous as laboratory vacuums. But it's also kinda awe-inspiring. And pretty. And amazing. And the topic of this week's Crash Course Astronomy. If you want to learn more (and yes, you really do) I've about nebulae so many times I'm not even sure how many posts there are about them here. Hundreds? Probably. You can search on them (switch to "Images" view to pic...