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We have likened the star-gas-star cycle in our Milky Way to the ecosystem that s
We have likened the star-gas-star cycle in our Milky Way to the ecosystem that sustains life on Earth. Here on our planet, water molecules cycle from the sea to the sky to the ground and back to the sea. Our bodies convert atmospheric oxygen molecules into carbon dioxide, and plants convert the carbon dioxide back into oxygen molecules. How are the cycles of matter on Earth similar to the cycles of matter in the galaxy? How do they differ? Do you think the term ecosystem is appropriate in discussions of the galaxy? Furthermore, in the chapters on stars, we learned why we are “star stuff.” Based on what you’ve learned, explain why we might also be considered “galaxy stuff.” Does the fact that the entire galaxy was involved in bringing forth life on Earth, change your perspective on Earth or on life in any way? If so, how? If not, why not?
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