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Astronomy Day #2.

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Presentation on theme: "Astronomy Day #2."— Presentation transcript:

1 Astronomy Day #2

2 Review from Day #1, then quiz
astronomy rotation tilt axis day/night revolution orbit elliptical gravity inertia season equinox solstice www.

3 In your notebook (on a piece of paper), define, describe or sketch today’s vocabulary—use page 555 & 600 theory Geocentric model Heliocentric model Big Bang universe galaxy solar system AC: also read pages

4 Theories about the center of the universe— make a double bubble
A theory is an explanation of related observations. Geocentric EARTH centered (sun, moon, stars, planets revolve around Earth) Believed until 1500 AD Early cultures and Ptolemy Heliocentric Sun centered (planets and comets revolve around the sun) 1500 AD to present Copernicus*, Galileo, Kepler, Newton Are either correct?—Helio is mostly correct

5 Ptolemaic theory (geocentric) Copernicus’s theory (heliocentric)

6 Review question What did the geocentric theory state? Is this theory correct? >>Earth is at the center of the solar system (incorrect)

7 Big Bang Theory (theory of the formation of the Universe --1950)
matter, time and energy were compressed into an extremely small ball (very unstable) exploded about BILLION years ago DYK: Every hour the Universe expands by a billion miles in all directions. Brainpop: Big Bang

8 Brainpop: Galileo Discuss:
Universe Galaxy Solar System Planets make a space timeline:

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