Theories of the Universe

Space and all the matter and energy in it.

• Space
• Solar System 
• Universe
• Sun

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The sun and all of the planets and other bodies that travel around it. 

• Universe 
• Galaxy 
• Star
• Solar System 

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The most commonly accepted theory that explains the beginning of our known universe is the -

• Theory of Evolution
• Big Bang Theory
• Cell Theory
• Blackhole theory

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Which of the following is the largest?

• star
• universe
• cluster
• galaxy

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What does the Big Bang theory suggest?

• The universe was just there
• The Milky Way is the only solar system
• The universe is continually expanding
• The universe started as a point, expanded, and will return to a point

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________ holds all of the planets in orbit around the sun.

• Gravity
• String
• Bill Nye
• Duct tape

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The shape of our Milky Way galaxy can be classified as ____________.

• Spiral
• Elliptical
• Irregular
• French

The Sun's position in the Milky Way galaxy is on the _______ of a spiral away from the center.Skip
17

• Center
• Edge
• Middle
• Outside

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A scientific theory...

• is based on lots of evidence
• is not valid
• is not reliable
• has not been tested many times

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Match the scientific theory to the correct definition:
The Big Bang Theory

• Animals and plants change gradually over a long period of time through a process of natural selection
• The planets move around the sun, not the other way around
• An explosion of heat that occurred 15 billion years ago and from which the Universe originated
• The force which makes two objects move towards each other, most commonly when an object falls to the ground

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NGSS.HS-ESS1-2