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Astrophysics > 1 > Flashcards

1 Flashcards

1
Q

What is a black hole?

A

A region in space where gravity is so strong that nothing, not even light, can escape.

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2
Q

True or False: Black holes can be seen directly.

A

False

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3
Q

Fill in the blank: A black hole is formed when a _______ star collapses.

A

massive

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4
Q

What is the boundary around a black hole called?

A

The event horizon.

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5
Q

What happens if something crosses the event horizon?

A

It cannot escape the black hole.

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6
Q

Multiple Choice: What is the point at the center of a black hole called? A) Singularity B) Event Horizon C) Galaxy

A

A) Singularity

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7
Q

What are the two types of black holes?

A

Stellar black holes and supermassive black holes.

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8
Q

True or False: Supermassive black holes are found at the center of most galaxies.

A

True

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9
Q

Fill in the blank: The Milky Way galaxy has a supermassive black hole known as _______.

A

Sagittarius A*

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10
Q

What is one way scientists detect black holes?

A

By observing the effects of their gravity on nearby stars.

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11
Q

Multiple Choice: Which of the following can a black hole pull in? A) Light B) Gas C) Stars D) All of the above

A

D) All of the above

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12
Q

What is the ‘point of no return’ around a black hole called?

A

The event horizon.

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13
Q

True or False: Black holes can grow by absorbing matter.

A

True

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14
Q

Fill in the blank: A black hole’s gravitational pull is _______ than that of other objects.

A

stronger

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15
Q

What happens to time near a black hole?

A

Time slows down compared to areas farther away.

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16
Q

Multiple Choice: Which is NOT a type of black hole? A) Mini black hole B) Stellar black hole C) Giant black hole

A

C) Giant black hole

17
Q

What is the ‘Hawking radiation’?

A

Theoretical radiation that black holes emit, which could lead to their eventual evaporation.

18
Q

True or False: Black holes can be created by the collision of neutron stars.

A

True

19
Q

Fill in the blank: The first black hole ever discovered is called _______.

A

Cygnus X-1

20
Q

What is a common misconception about black holes?

A

That they suck everything in around them like a vacuum.

21
Q

Multiple Choice: What do we call the area around a black hole where matter is spinning? A) Accretion disk B) Orbit C) Nebula

A

A) Accretion disk

22
Q

True or False: All black holes are the same size.

A

False

23
Q

What is the largest known black hole?

A

TON 618.

24
Q

Fill in the blank: Black holes can be detected indirectly by observing their effect on _______.

A

surrounding stars and gas.

25
Q

What is the scientific term for the study of black holes?

A

Astrophysics.

26
Q

Multiple Choice: How do black holes affect light? A) They make it brighter B) They bend it C) They eliminate it

A

B) They bend it

27
Q

True or False: Once something falls into a black hole, it can come back out.

A

False

Astrophysics (2 decks)

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