What has to happen in order for a black hole to form at the center of a galaxy?

Tons of matter must gather at the center of the galaxy

How are black holes similar to large stars?

Both exhibit strong gravitational forces

What is the definition of space-time?

A measure of the stuff that the universe is made of

Which of these statements is an opinion about black holes?

Black holes are the most mysterious parts of the universe

What happens after an object passes into a black hole's event horizon?

The object must eventually enter the black hole

What do black holes look like? *this question updated in 2019...

A black circle, with a disc of light that has bent around it

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BrainPOP: Black Holes

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Answers

1
What has to happen in order for a black hole to form at the center of a galaxy?
A star has to become a brown dwarf first
Tons of matter must gather at the center of the galaxy
A star has to explode in a supernova
A star has to become a red giant first
2
"Black holes exhibit substantial gravitational forces," what does "substantial" mean?
Opposing
Long-ranging
Powerful
Weak
3
How are black holes similar to large stars?
Both have relatively little mass
Both emit light
Both need to burn fuel in order to sustain their existence
Both exhibit strong gravitational forces
4
Place the following events in sequence:
A, C, B
C, B, A
B, A, C
B, C, A
5
What is the definition of space-time?
The measuring device that existed before the Big Bang
How long it takes an object to enter a black hole
The amount of time it takes to travel a particular distance
A measure of the stuff that the universe is made of
6
Which of these statements is an opinion about black holes?
A human being could never escape a black hole's gravity
No one knows what a black hole looks like
Black holes are the most mysterious parts of the universe
Scientists think there's black hole at center of our galaxy
7
According to Einstein, an object's gravitational pull depends on its:
Density
Mass
Size
Volume
8
According to our current understanding, the universe is:
Five-dimensional
Six-dimensional
Four-dimensional
Three-dimensional
9
What happens after an object passes into a black hole's event horizon?
The object will circle the black hole forever
The object has a 50% chance of entering the black hole
The object is flung back into space
The object must eventually enter the black hole
10
What do black holes look like? *this question updated in 2019...
Big brown circles
Long tubes that emanate light
A black circle, with a disc of light that has bent around it
Thousands of tiny dark spots

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