Crab Nebula reveals gas from ancient supernova explosion Betelgeuse shows late-stage evolution of a massive star Stellar death spreads elements, triggering new star formation ...

Betelgeuse, one of the largest stars ever discovered, is reaching the end of its life. In the coming centuries or perhaps even right now it could explode into a supernova visible even during the day.

Here are the largest objects and phenomena we've observed in the universe so far. For the sake of variety, we've divided it into four categories: planets, stars, galaxies, and structures (phenomena ...