Expanding Pluto

Aliens on Pluto have to go on a space exploration to find more planets suitable for their species. The main character is a jumpy, jittery mess, saw the ad for the volunteers and saw it as a means to get away from society and the fear of social interaction. That was a foolish decision. The space crew decides to fly toward the sun, despite their cold habitat, and find their way onto Earth. That was a foolish description.