Our Galaxy - Announcements Observing tonight is cancelled...

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1 Our Galaxy AST 201 Lecture: February 23, 2010 Announcements Observing tonight is cancelled Midterm next Tuesday! STUDY! Rooms (arranged by tutorial section) will be posted on Blackboard this week Office Hours this week, all in AB 113: Make use of them! Tutorials Resume on March 9 Clicker Question: Which of the following is our Galaxy? A) B) C) D) E) We’re Inside!!! A Clip from “The Known Universe” from the American Museum of Natural History Galaxy Rap Sheet Spiral Galaxy, 100 000 ly in diameter Only 1000 ly thick Over 100 Billion Stars Composed of a Disk, a central Bulge and the Halo Hangs out with the Small and Large Magellanic Clouds (orbiting the Milky Way at 200 and 150 thousand light years away)
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2 Clicker Quiz: Where are we in the Galaxy? A) In the Galactic Halo B) In the Disk of the Galaxy C) In the Bulge of the Galaxy D) Right in the Centre Where are we in the Galaxy? We’re roughly halfway through the disk of the Galaxy Roughly halfway between the centre of the Galaxy (the bulge) and the outside (28 000 ly) Sadly, we’re not the centre of the universe. We’re not even the centre of our Galaxy – and that’s a good thing! The Answer was B!
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Our Galaxy - Announcements Observing tonight is cancelled...

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