The Sun

Most of the sun’s energy is a result of

• nuclear fusion  
• nuclear fission
• atomic reactions
• coronal mass ejection

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

When hydrogen nuclei fuse into helium nuclei

• the nuclei die.
• energy is released.
• particles collide
• particles neutralize.

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

Auroras are frequently seen

• near the equator.
• before a sunspot cycle.
• every 11 years.
• after solar flares.

Sunspots vary in a cycle that lasts about

• 110 yrs
• 11,000 yrs
• 11 yrs
• 110,000 yrs

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NGSS.MS-ESS1-1

What elements make up most of the sun’s mass?

• carbon and oxygen
• carbon and hydrogen
• helium and nitrogen
• hydrogen and helium

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NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

During nuclear fusion in the sun, which of the following occurs?

• Atomic nuclei split apart.
• The aurora australis appears.
• hydrogen nuclei combine to produce a helium nucleus.
• A solar eclipse results

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NGSS.HS-ESS1-1

NGSS.HS-PS1-8

What are northern lights?

• Auroras
• solar flares
• prominences
• coronas

How many stars are there in the Milky Way?

• Hundreds
• Hundreds of thousands
• Hundreds of millions
• Hundreds of billions

What protects Earth from solar winds?

• The poles

• The moon's gravity

• The magnetic field and the atmosphere

• The tidal range

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NGSS.HS-PS2-5

What causes aurora borealis or northern lights?

• The Corona
• Prominences
• Sunspots
• Solar Flares

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NGSS.HS-PS2-5