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1) The document describes a ranking task that orders major events in the history of the universe from longest ago to most recent. It then provides context about the "cosmic calendar" that compresses the 14 billion year history of the universe into a single calendar year. 2) On the cosmic calendar, the Big Bang occurred at the start of the year on January 1st, approximately 14 billion years ago. 3) Earth formed in early September on the calendar, around 4.5 billion years ago.
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- 1. 1/20/2019 Mastering Assignments https://ivylearn.ivytech.edu/courses/919113/modules/items/217058531/4 Part A - Ranking Task Consider the indicated events in the history of the universe that have helped make human life possible. Rank the events based on when they occurred, from longest ago to most recent. To rank items as equivalent, overlap them. Note: If two events occurred within seconds of each other, rank them as equivalent. View Available Hint(s) Previous Answers Correct Now that you know the order in which these events occurred, continue on to check whether you know approximately when they occurred. Reset Help Submit Most recent Longest ago This study source was downloaded by 100000836729509 from CourseHero.com on 06-22-2022 15:43:55 GMT -05:00
- 2. 1/20/2019 Mastering Assignments https://ivylearn.ivytech.edu/courses/919113/modules/items/217058532/4 Part B According to current scientific estimates, when did the Big Bang occur? View Available Hint(s) Previous Answers Correct Scientists estimate the age of the universe by measuring the expansion rate, from which they can determine how long it has taken the universe to reach its current size. Current estimates put this age at about 14 billion years. In the rest of this activity, we will consider the timing of events using a type of time line known as the “cosmic calendar.” Originally developed by Carl Sagan, the cosmic calendar compresses the history of the universe into a single year, with the Big Bang occurring at the first instant of January 1 and the present being the stroke of midnight on December 31. Part C On the cosmic calendar, which compresses the history of the universe into a single year, about when did Earth form? View Available Hint(s) about 20 billion years ago about 14 billion years ago about 10 billion years ago about 4 1/2 billion years ago about 65 million years ago Submit This study source was downloaded by 100000836729509 from CourseHero.com on 06-22-2022 15:43:55 GMT -05:00
- 3. 1/20/2019 Mastering Assignments https://ivylearn.ivytech.edu/courses/919113/modules/items/217058533/4 Previous Answers Correct The cosmic calendar compresses the 14-billion-year history of the universe into 1 year, which means that each month represents about 1.2 billion years. The solar system's age of 4 ½ billion years therefore puts its birth in early September. Part D On the cosmic calendar, which compresses the history of the universe into a single year, about when did life arise on Earth? View Available Hint(s) Previous Answers very early in January in mid-February in June in early September in mid-December Submit in late January in mid-August in September in mid-December just a few hours before midnight on December 31 Submit This study source was downloaded by 100000836729509 from CourseHero.com on 06-22-2022 15:43:55 GMT -05:00
- 4. 1/20/2019 Mastering Assignments https://ivylearn.ivytech.edu/courses/919113/modules/items/217058534/4 Correct From Part C, Earth formed in early September on the cosmic calendar. Life apparently arose on Earth within less than a billion years after that, which means it was still in September (because each month on the cosmic calendar represents about 1.2 billion years). Part E On the cosmic calendar, which compresses the history of the universe into a single year, about when did early humans first walk on Earth? View Available Hint(s) Previous Answers Correct The cosmic calendar compresses the 14-billion-year history of the universe into 1 year, which means that each day represents about 1/365 of 14 billion years, or about 40 million years. Early humans arose just a few million years ago, which therefore means just a few hours before the present moment (the stroke of midnight on December 31) on the cosmic calendar. in June in September in mid-December on December 30 just a few hours before midnight on December 31 Submit This study source was downloaded by 100000836729509 from CourseHero.com on 06-22-2022 15:43:55 GMT -05:00 Powered by TCPDF (www.tcpdf.org)