Crowds gather in the village of Oia to catch the spectacular sight of the sun sinking into the Aegean Sea. The white-washed buildings with blue domes create a perfect contrast to the colorful sky.

"Our heliosphere is this massive, gigantic object that spans so far out from the sun, and PUNCH is going to connect from the closest end of the sun to the farthest out," Joe Westlake, the director ...