The biggest planet in the Solar System. And the smallest star in the known Universe. Today, they are on a collision course.

What if Jupiter was right next to the Sun? Or what if Earth switched places with Mars? Today, we're re-arranging the planets in our Solar System from largest to smallest. And then flipping them back ...

Astronomers have spotted a cosmic mismatch that has left them perplexed — a really big planet orbiting a really small star. The discovery defies current understanding of how planets form. The star is ...