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EPSS3_HW2_Fall2017.pdf - Due: Week 3 in Discussion Section...

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Due: Week 3 in Discussion SectionEPSS3 Astrobiology Homework 2Lecture 3 and 4Name:UID:Section:1.What was the first measurement that led us to believe the universe isexpanding? Briefly explain in one to two sentences.2.Which of the following explains how the first generation of galaxies wasformed?A. The universe attains a density more than the critical density andrecollapsesB. Regions of higher density (evidenced in CMB observations) exert aslightly greater gravitational pull and accumulate matterC. Supernova explosions occur at the end of a star’s life when fusionstops and gravity takes overD. Dark energy acts against gravity to accelerate the expansion of theuniverse
3.i) Which of the following does not describe an era of the Big Bang?
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