Is Pluto a planet? What's up with the "space jellyfish?" And are aliens real? Astrophysicist, speaker and author Neil deGrasse Tyson, who is stopping in Pittsburgh later this month, answers our ...

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.

Are aliens real? The question has animated conspiracy theories for decades and enthralled at least one former president of the United States. In a recent interview, Barack Obama became the first ...