Is the big bang, and all that came from it, a holographic mirage from another dimension?
The largest stars die in explosions more powerful than anyone thought possible—some triggered in part by the production of antimatter
Thousands of years ago a star exploded in a supernova, leaving behind the glorious riot of colored gas we see now as the Crab Nebula. The light from this explosion reached Earth in 1054 A.D., creating what looked like a new bright star in the sky as recorded by ancient Chinese and Arab astronomers.
Maybe not. The observations that led astronomers to deduce its existence could have another explanation: our galaxy lies at the center of a giant cosmic void
Cosmic dust is crucial to the birth of stars and planets, but how so much of it came to be present in the young universe has been a mystery