I don’t know what Valerian is or why it’s popular, but Cara Delevingne is in the upcoming movie, so they’ve got my money.
Here’s the first trailer. Visually, it looks amazing. I have no clue what’s going on, but Luc Besson did the writing and direction, so I’m sure the whole thing will be awesome. Watch the trailer and then go read the comics so you can impress your friends.