Velella velella, or by-the-wind sailors, have become a more common sight washed up along the Oregon coast as oceans warm.

Striking images of bright “ red jellyfish ” appearing in the sky above storm clouds have sparked a wave of speculation online, with some social media users even floating theories about alien activity.

Add Yahoo as a preferred source to see more of our stories on Google. Is Pluto a planet? What's up with the "space jellyfish?" And are aliens real? Astrophysicist, speaker and author Neil deGrasse ...