Well done master detective! Pluto did try to find cover in Canis Dwarf Galaxy. However, you just missed him.
I'm Vera Rubin and I discovered dark matter. I was sent by your double agent to let you know he's been sighted jumping onto the the type of galaxy made mostly of stars and very little gas. People say this kind of galaxy looks like a swarm of buzzing bees!
Use these images to find out what kind of galaxy he's disappeared into:
Where, oh master space detective, do you think he's gone??