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Physics > Astrophysics > Flashcards

Astrophysics Flashcards

1
Q

What is the largest planet in our solar system?

A

Jupiter

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2
Q

True or False: The Milky Way is a spiral galaxy.

A

True

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3
Q

Fill in the blank: The process by which stars generate energy is called ______.

A

nuclear fusion

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4
Q

What is the name of the closest star to Earth?

A

Proxima Centauri

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5
Q

Which planet is known for its prominent ring system?

A

Saturn

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6
Q

True or False: Black holes can emit light.

A

False

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7
Q

What is the term for a group of stars that are bound together by gravity?

A

Star cluster

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8
Q

What is the primary component of the Sun?

A

Hydrogen

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9
Q

Fill in the blank: The observable universe is estimated to be about ______ billion light-years in diameter.

A

93

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10
Q

What is the name of the force that keeps planets in orbit around the Sun?

A

Gravity

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11
Q

What is the unit of measurement for astronomical distances?

A

Light-year

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12
Q

True or False: A supernova is a massive explosion that occurs at the end of a star’s life cycle.

A

True

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13
Q

What is the name of the effect that causes the redshift of distant galaxies?

A

Doppler effect

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14
Q

Fill in the blank: The ______ is a region around a black hole from which nothing can escape.

A

event horizon

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15
Q

What is the main difference between a comet and an asteroid?

A

Comets are icy bodies, asteroids are rocky.

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16
Q

What is the term for the study of the universe as a whole?

A

Cosmology

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17
Q

Which planet is known as the ‘Red Planet’?

A

Mars

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18
Q

What is the name of our galaxy?

A

Milky Way

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19
Q

True or False: Neutron stars are formed from the remnants of supernovae.

A

True

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20
Q

What is the primary source of energy for the Earth?

A

The Sun

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21
Q

Fill in the blank: The ______ is a vast region of space where no matter exists.

A

vacuum

22
Q

What is the term for a star that suddenly increases in brightness?

A

Nova

23
Q

What is the approximate age of the universe?

A

13.8 billion years

24
Q

True or False: Light travels faster in a vacuum than in air.

A

True

25
Q

What is the name of the boundary beyond which no information or matter can escape from a black hole?

A

Event horizon

26
Q

Fill in the blank: The ______ is the force that opposes the expansion of the universe.

A

gravitational force

27
Q

What type of galaxy is characterized by an elliptical shape?

A

Elliptical galaxy

28
Q

What is the main component of a neutron star?

A

Neutrons

29
Q

True or False: The universe is currently expanding.

A

True

30
Q

What is the term for the temperature at which all molecular motion ceases?

A

Absolute zero

31
Q

What phenomenon explains why we see different constellations at different times of the year?

A

Earth’s orbit around the Sun

32
Q

Fill in the blank: The ______ is the region of space surrounding a star where planets can form.

A

protoplanetary disk

33
Q

What is the name of the first artificial satellite launched into space?

A

Sputnik 1

34
Q

What is the primary force that drives stellar evolution?

A

Nuclear fusion

35
Q

True or False: The Andromeda Galaxy is on a collision course with the Milky Way.

A

True

36
Q

What is the term for the motion of stars and galaxies moving away from us?

A

Redshift

37
Q

Fill in the blank: The ______ is the region of space where a star is born.

A

nebula

38
Q

What is the name of the largest volcano in the solar system?

A

Olympus Mons

39
Q

What is the significance of the Hubble Space Telescope?

A

It has provided deep space images and contributed to the understanding of the universe.

40
Q

True or False: Dark matter makes up about 27% of the universe’s total mass-energy content.

A

True

41
Q

What is the closest galaxy to the Milky Way?

A

The Andromeda Galaxy

42
Q

Fill in the blank: The ______ is the region of space where light has been trapped by a black hole.

A

event horizon

43
Q

What is the term for the hypothetical boundary of the observable universe?

A

Cosmic horizon

44
Q

What is the primary constituent of a comet’s nucleus?

A

Ice and dust

45
Q

True or False: The speed of light is approximately 300,000 kilometers per second.

A

True

46
Q

What is the term for a star that has exhausted its nuclear fuel and collapsed under its own gravity?

A

White dwarf

47
Q

Fill in the blank: The ______ is the force that causes the acceleration of objects towards each other due to their mass.

A

gravitational force

48
Q

What is the name of the effect that describes the change in frequency of a wave in relation to an observer?

A

Doppler effect

49
Q

True or False: A light-year is a measure of time.

A

False

50
Q

What is the name of the scale used to classify the brightness of stars?

A

Magnitude scale

Physics (12 decks)

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