Transcript UNIVERSE - Qatar University

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
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