1. Unit 2
ASTRONOMY

2. Astronomy
Study of objects in space such as the Sun, stars, planets, comets, gas, & galaxies.
*Also, the Earth’s place in the universe.
Universe = everything that exists

3. Astrology is NOT science !!!
Disclaimer:
Astrology is NOT science !!!
There is currently no evidence that star positions affect human behavior or your future.
Go ahead & read your
horoscope but remember
that it is just entertainment!

4. Geo-centric Helio-centric
Earth-centered
view of universe
Sun-centered
view of solar system
C. Ptolemy
90-168
N. Copernicus
modern view of the solar system:
“the Sun” is a star
planets orbit the Sun

5. Cosmic Size and Distance

6. Cosmic Size and Distance

7. How big are YOU in the Universe
How big are YOU in the Universe? THE SCALE OF THE UNIVERSE Visit

8. Galaxies = groups of billions of stars
there are more than 100 billion galaxies
they all have different shapes
Spiral
Elliptical
Irregular

9. Write down your predictions
Write down your predictions? clusters & constellations universe stars asteroids, meteors, meteorites solar systems galaxies planets - moons

10. The “Big Dipper” constellation is a pattern made of 7 stars
Cosmic Size
The “Big Dipper” constellation is a pattern made of 7 stars

11. Cosmic Size and Distance

12. Cosmic Size and Distance