What is a Black Hole?
What is a black hole?
A region in space where gravity is so strong that not even light can escape.
What type of star forms a black hole?
A very massive star
What happens to time near a black hole?
It slows down
Can scientists see black holes directly?
No
What is the boundary around a black hole called?
The event horizon
What pushes outward to balance a star during its life?
Fusion
What is time slowing near strong gravity called?
Time dilation
How do scientists know black holes exist?
By observing their effects on nearby stars and light
What is at the center of a black hole called?
The singularity
What happens when a star runs out of fuel?
It collapses inward under gravity
Who developed the theory that explains time dilation and gravity?
Albert Einstein
What is the biggest black hole ever discovered?
Ton 618
Why can’t we see black holes directly?
Because they emit no light and trap all light that enters them.
What huge explosion can happen when a star collapses?
A supernova
Does time move the same everywhere in the universe?
No, it depends on gravity
What is Sagittarius A?
The supermassive black hole at the center of the Milky Way.
What theory first predicted black holes?
Einstein’s theory of General Relativity
What forms after the core of a massive star collapses completely?
A black hole
Is time travel to the past possible using black holes?
No
About how many kilometers wide is Ton 618?
390 billion kilometers.