1. Space intro -Stars -Galaxies - Human history ∞? ∞

2. What is a star system? o We call ours the solar system o has only one star, the sun. But… oThe majority of stars in our milky way are groups of two or more stars otwo stars are called double stars or binary.

3. Binary Star systems o Eclipsing binary o When one star blocks the light from another o Most binaries are found by observing the effects of gravity.

5. Our Milky Way o It looks milky because: oIt looks hazy because there are: omany stars packed together oMany clouds of dust and gas

6. Types of Galaxies oSpiral Galaxy oFlat with arms that spiral outward like a pinwheel oEliptical Galaxies oLike a flattened ball oThey have very little gas and dust oIrregular shaped Galaxies o Who knows what they look like?

7. Scale of the Universe o Light travels from the sun to Earth in o 8 sec o How long would it take for a shuttle to travel at 100kph o 140 years! o It takes _______ for light to travel from the nearest star to Earth o 4 years o the nearest star is therefore 4 light years away

8. Scale of the Universe o The nearest galaxynearest galaxy o 1000s of light years away o 25000 lightyears away o Or over 200000 ly away depends on your definition of galaxy

9. Uses for the sky o Have you ever heard of any stories about using stars o escaping slaves or mariners MAYBE? o Constellations o Group of stars in the same part of the sky o They are Appear very close together o But are they…

10. Consider constellation: canis miniminor o Fall o Spring Can you indicate which star is closest with a 1 beside it and so on, to 5.

11. Canis minor as it appears from the Andromeda galaxy looks totally different Stars are not on a 2D plane but Spread from each other in 3D

12. Reflect…. o Write down everything you don’t know instinctively.