Introduction to Astronomy

Everything that exists

• Space

• The universe

• The galaxy

• Astronomy

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What is gravity?

• a force that pulls objects toward each other.

• Gravitational force earth is exerting on you.

• The measure of the amount of matter in an object is its mass.

• When the only force acting on an object is gravity.

As mass increases, gravitational force _____.

• increases

• decreases

• disappears

• remains constant

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As distance increases, gravitational force _____.

• increases

• decreases

• disappears

• remains constant

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A hot sphere of gas that generates light and heat through fusion.

• Star

• Black hole

• Nebula

• Interstellar medium

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The Sun and all the objects that orbit it.

• The solar system

• The local group

• Stellar cluster

• Galaxy

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Which is NOT in the solar system?

• The closest star, Proxima Centauri

• Jupiter

• Comets

• The Sun

An irregular body that orbits a star

• Comet/asteroid

• dwarf planet/planet

• planet/moon

• galaxy/nebula

What is a Galaxy?

• A cluster of planets

• A swirl of planets and stars

• A system of stars and dust that is bound by gravity

• A Samsung Device

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Name of our galaxy

• milk and honey

• snickers

• milky way

• milk shake

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