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10 Cards in this Set
- Front
- Back
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Where are we?
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We’re in the atmosphere, which is as thick as the bottom 1/20 of the skin of an apple. We’re in the Milky Way Galaxy.
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When are we?
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14 Billion years since the big bang theory, In cosmic years, humans evolved in the last two minutes before midnight of 12/31. Dinosaurs lived 4 cosmic days. We’re the equivalent of mayflies.
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How are we moving?
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We’re around the sun, which is in the Milky Way, which is close to Andromeda. We move 1 degree west every day.
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What are we made of?
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We’re made of H+ from the Big Bang, elements from old stars that were bigger than the Sun (star debris).
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Can we see the entire Universe?
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By looking to great distances, we can see what the universe looked like when it was younger.
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The relative sizes of things.
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If the Sun is considered the size of a grapefruit, then Jupiter could be considered the size of a marble and earth the size of the ball on a ball-point pen.
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celestial sphere
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The imaginary sphere in which objects in the sky appear to reside when observed from Earth.
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celestial poles
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Pole extended up to the sky into the celestial sphere.
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celestial equator
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The extension of the Earth’s equator onto the Celestial Sphere.
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Ecliptic
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The Sun’s apparent annual path among the constellations.
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