Topic 7: Astronomy Flashcards

1
Q

What is a galaxy?

A

A collection of stars, gas, and dust held together by gravity.

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2
Q

What is the name of our galaxy?

A

The Milky Way.

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3
Q

What is the Big Bang Theory?

A

The theory that the universe began from an extremely dense and hot state and has been expanding ever since.

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4
Q

What evidence supports the Big Bang Theory?

A

Redshift of galaxies and cosmic microwave background radiation.

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5
Q

What is a star’s life cycle for a star like the Sun?

A

Nebula → Main Sequence Star → Red Giant → White Dwarf.

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6
Q

What is a supernova?

A

A massive explosion that occurs at the end of a large star’s life.

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7
Q

What are black holes?

A

Regions of space with gravity so strong that not even light can escape.

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8
Q

What causes redshift in light from distant galaxies?

A

The stretching of light waves as galaxies move away due to the universe’s expansion.

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9
Q

What force keeps planets in orbit around the Sun?

A

Gravitational force.

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10
Q

What is a light year?

A

The distance light travels in one year (9.46 × 10^12 km).

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