short physics facts > Astrophysics > Flashcards

Astrophysics Flashcards

(10 cards)

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1
Q

Define a universe

A

large collection of billions of galaxies

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2
Q

Define a galaxy

A

large collection of billions of stars

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3
Q

Which galaxy is our solar system in?

A

The Milky Way

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4
Q

What force keeps planets and moons orbitting ?

A

gravitational force

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5
Q

Moons orbit ….

A

planets

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6
Q

Planets orbit ….

A

stars

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7
Q

Artificial satellites orbit the….

A

earth

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8
Q

Comets orbit the …..

A

sun

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9
Q

The gravitational field strength of an object depends on its …

A

mass

more massive means larger gravitational field strength

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10
Q

Equation: orbital speed =

A

orbital speed = 2 pi r / T

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