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Sun and Seasons
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drive wind bands – which drive surface currents

drive deep ocean currents

drive water cycle

drive weather

Credit: NASA GSFC Water and Energy Cycle

Slide 29

Sun as a Source of Energy

Sun as a Source of Energy

Plants need light for photosynthesis

Without its heat, the only inhabitable areas on Earth would be near volcanic vents

Slide 30

Young stars form in nebulae from Small Magellanic Cloud

Young stars form in nebulae from Small Magellanic Cloud

Slide 31

Star-forming region in the Large Magellanic Cloud:

Star-forming region in the Large Magellanic Cloud:

Slide 32

Sun as a Source of Energy

Slide 33

Our Sun is a Regular/ Small Star

Our Sun is a Regular/ Small Star

Slide 34

In a few Billion years… Red Giant

In a few Billion years… Red Giant

Slide 35

Our Sun’s Habitable Zone

Our Sun’s Habitable Zone

Billions of years ago, things may have been different

The Sun was cooler (by up to 30%!)

Earth’s atmosphere was different (thicker, carbon dioxide)

Conditions will be different in the future

By many accounts, increases in the Sun’s temperature will make Earth uninhabitable in 1 billion years or less

These changes will also affect other planets… Mars?

Slide 36

By 5 billion years… White Dwarf

By 5 billion years… White Dwarf

Slide 37

Our Sun’s Habitable Zone

Slide 38

Our Sun’s Habitable Zone

Slide 39

Massive Stars are different

Massive Stars are different

Slide 40

Betelgeuse

Betelgeuse

Slide 41

Supernova—Massive Star Explodes

Supernova—Massive Star Explodes

Images at

Slide 42

Done with the Sun

Done with the Sun

Time for Seasons!

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