Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
BLACK HOLE •Albert Einstein invented black holes •First, it was denied • Today’s technology confirm that black holes exist WHAT IS A BLACK HOLE? - A region of spacetime from which nothing can escape - It comes from stars -a star spends all its energy -contracts -pulls things inside its own -the center singularity -border event horizon -no time and no event inside it DO THEY REALLY EXIST? - Impossible to see - When the fuel finishes, explode into a supernova - radio, telescopes find this - Lots of black holes is seen EXAMPLE 1. M87 • Active galaxy • Lots of interesting objects • There is a spiral-shaped disc of hot gas • It is not big, but it weighs three billion times as much as the sun • So the gravity is so strong DESIGNED BY