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Black Holes 101 | National Geographic

Black Holes 101 | National Geographic

National Geographic

11.6M views 8 years ago

Warm-up Questions

What do you already know about black holes?
Why do you think black holes are called mysterious?
What kind of information would you expect to learn from a video called "Black Holes 101"?

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Black Holes 101 | National Geographic

What black holes are (00:00 – 00:45)

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1. Why can't light escape from a black hole?

Because the gravity is extremely strong
Because space is empty around it
Because stars block it
Because it moves too slowly

2. What is the boundary of a black hole called?

The gravity ring
The outer shell
The event horizon
The galaxy edge

3. What is the singularity described as?

A bright ring around the black hole
An infinitely small, infinitely dense point
A giant exploding star
A cloud of gas and dust

Black Holes 101 | National Geographic

Types of black holes (00:45 – 01:41)

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1. How do stellar black holes form?

When planets collide
When galaxies disappear
When massive stars die and collapse
When comets freeze

2. How large can supermassive black holes be compared with our sun?

Only 10 to 20 times more massive
Hundreds of times more massive
About the same size
Millions or even billions of times more massive

3. Where are supermassive black holes found?

Inside comets
On the edge of the universe
At the center of large galaxies
Only near Earth

Black Holes 101 | National Geographic

How scientists detect and understand black holes (01:41 – 03:11)

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1. How do scientists detect and study black holes?

By landing spacecraft on them
By measuring their color
By listening to sounds from space
By observing their effect on nearby matter

2. What is an accretion disk?

A disk of ice around a planet
A tool scientists use in telescopes
A ring of light escaping from a star
A disk of particles formed by gases and dust falling toward a black hole

3. When was the first black hole discovered according to the video?

1971
1951
2001
1916

Black Holes 101 | National Geographic

Transcript will load here…

1. Which statement best summarizes the video?

Scientists fully understand how all black holes form
Black holes only exist in the Milky Way
Black holes are powerful objects that affect space, matter, and galaxies
Black holes are easy to see with telescopes

2. What is one major challenge in studying black holes?

They are invisible, so scientists study their effects indirectly
They move faster than all stars
They only appear once every hundred years
They are too cold to measure

3. What contrast does the video make between stellar and supermassive black holes?

Stellar black holes come from collapsing stars, while supermassive black holes are much larger and found in galactic centers
Stellar black holes exist only in theory, but supermassive ones do not
Stellar black holes are older than the universe, but supermassive ones are new
Stellar black holes are visible, but supermassive ones are invisible

Discussion Questions

Discuss the ideas from this video

Black Holes 101 | National Geographic

Why do you think black holes are so fascinating to people?
How would you explain a black hole to someone with no science background?
Do you think scientists will ever fully understand what happens inside a black hole? Why or why not?
Why is indirect evidence important in science, especially for studying things we cannot see directly?

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