Week 4 Discussion
For this week’s discussion about galaxies please watch this fifteen minute TED Talk from Andrea Ghez who has been a friend of many years and “the” expert in galaxy motion. Then Discuss:
1) what do many astronomers believe is in the center of our galaxy
2) what are the scientific facts that help prove it’s existence
3) how does it help our galaxy rotate
Your initial discussion must be at least 250 words.
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