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Year 9 > Big Bang > Flashcards

Big Bang Flashcards

1
Q

What is the Big Bang theory?

A

The Big Bang theory is the leading explanation for the origin of the universe, suggesting it began as a singularity and expanded over time.

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2
Q

True or False: The Big Bang theory states that the universe is static and unchanging.

A

False

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3
Q

Fill in the blank: The universe began approximately _____ billion years ago.

A

13.8

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4
Q

What are the primary pieces of evidence supporting the Big Bang theory?

A

Cosmic microwave background radiation, the abundance of light elements, and the redshift of distant galaxies.

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5
Q

What is cosmic microwave background radiation?

A

Cosmic microwave background radiation is the afterglow radiation from the Big Bang, filling the universe and detectable in all directions.

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6
Q

Which element is most abundant in the universe as predicted by the Big Bang nucleosynthesis?

A

Hydrogen

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7
Q

What does the redshift of galaxies indicate?

A

The redshift of galaxies indicates that the universe is expanding.

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8
Q

Multiple Choice: What event does the Big Bang theory describe?

A

A) The formation of stars B) The origin of the universe C) The end of the universe D) The formation of planets

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9
Q

Short Answer: Who first proposed the idea of the expanding universe?

A

Edwin Hubble

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10
Q

What is dark energy?

A

Dark energy is a mysterious force that is driving the accelerated expansion of the universe.

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11
Q

True or False: The universe is currently believed to be in a state of contraction.

A

False

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12
Q

What is the significance of Hubble’s Law?

A

Hubble’s Law provides evidence for the expansion of the universe, showing that galaxies are moving away from us at speeds proportional to their distance.

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13
Q

Fill in the blank: The observable universe is about _____ times larger than the visible universe.

A

93 billion light-years

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14
Q

What is the role of the inflationary model in the Big Bang theory?

A

The inflationary model proposes a rapid expansion of the universe at the very beginning, explaining the uniformity of the cosmic microwave background.

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15
Q

Short Answer: What does the term ‘singularity’ refer to in the context of the Big Bang?

A

A singularity refers to a point where density and gravitational forces are infinitely high, marking the beginning of the universe.

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16
Q

What is baryonic matter?

A

Baryonic matter is the type of matter that makes up stars, planets, and living beings, composed of protons, neutrons, and electrons.

17
Q

True or False: The Big Bang theory is universally accepted among scientists.

A

True

18
Q

What is the significance of the abundance of helium and lithium in the universe?

A

The abundance of helium and lithium supports the predictions of Big Bang nucleosynthesis.

19
Q

Multiple Choice: Which of the following is NOT a prediction of the Big Bang theory?

A

A) Cosmic microwave background radiation B) The existence of black holes C) The abundance of light elements D) The expansion of the universe

20
Q

Fill in the blank: The Big Bang theory was first proposed in the early _____ century.

A

20th

21
Q

What is a light-year?

A

A light-year is the distance that light travels in one year, approximately 5.88 trillion miles.

22
Q

Short Answer: What major discovery did Arno Penzias and Robert Wilson make in 1965?

A

They discovered the cosmic microwave background radiation.

23
Q

What does the term ‘cosmology’ refer to?

A

Cosmology is the scientific study of the large scale properties and evolution of the universe.

24
Q

True or False: The Big Bang theory explains the formation of black holes.

A

False

25
Q

What is the observable universe?

A

The observable universe is the portion of the entire universe that we can see and measure, limited by the speed of light.

26
Q

Multiple Choice: What tool is primarily used to observe distant galaxies and measure their redshift?

A

A) Radio telescopes B) Optical telescopes C) Space probes D) Particle accelerators

Year 9 (7 decks)

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