12/21/2016HW#2 - Chapter 2: Discovering The Universe for Yourselfhttps://session.masteringastronomy.com/myct/assignmentPrintView?assignmentID=16662861/49HW#2 Chapter 2: Discovering The Universe for YourselfDue: 11:59pm on Tuesday, November 22, 2016You will receive no credit for items you complete after the assignment is due.Grading PolicySeasons 1: What Is the Cause of the Seasons?Learning Goal:To understand the basic cause of the seasons and address a common misconception by showing that seasons arenotrelated to Earth's varying distance from the Sun.Introduction.Earth’s orbit around the Sun is elliptical (rather than circular), which means the Earth–Sun distance varies over the course of each year. The following tablegives the Earth–Sun distance at the equinoxes and solstices:Time of YearEarth–Sun DistanceMarch (northern spring) equinox149.0 million kmJune (northern summer) solstice152.0 million kmSeptember (northern fall) equinox150.2 million kmDecember (northern winter) solstice147.2 million kmPart ARefer to the data in the introduction. Rank the seasonsfor the Northern Hemispherebased on Earth’s distance from the Sun when each season begins, from closestto farthest.Hint 1.Starting points of seasons in the Northern HemisphereWe generally say that winter in the Northern Hemisphere begins when Earth is at the point in its orbit called the December solstice (or northern winter solstice),which occurs around December 21 each year. Similarly, we say that spring begins at the March (or northern spring) equinox around March 21, summer beginsat the June (or northern summer) solstice around June 21, and fall begins at the September (or northern fall) equinox around September 21.ANSWER:
LSU Mastering Astronomy 1101 Homework Assignments: Test 1: Homework 2: 1. How many months of the year have 28 days? a. 12 2. Rank from largest to smallest “cosmic address” a. Universe, the local supercluster, the local group, the milky way galaxy, our solar system, the sun, Jupiter, Earth. 3. Rank distances longest-shortest (Milky way-AU) a. The distance from the milky way galaxy to the Andromeda Galaxy b. Distance from the sun to the center of the milky way galaxy c. Distance from Earth to Alpha Centauri d. One light-year e. Distance across our solar system (to Neptune) f. 4. The average distance between Earth and the Sun, which is about 150 million kilometers. a. AU- astronomical unit 5. The distance that light travels in year, which is about 9.46 trillion kilometers. a. Light year 6. Earth’s average distance from the Sun. a. AU 7. Two stars that are in the same constellation: a. May actually be very far away from each other. 8. Rank the seasons for the Northern Hemisphere based on Earth’s distance from the sun when each season begins, from closest to farthest. a. Winter, spring, fall, summer 9. Rank the seasons for the Southern Hemisphere based on Earth’s distance from the sun when each season begins, from closest to farthest. a. Summer, fall, spring, winter 10. T/F: “The variation in Earth-Sun distance over the course of each year has virtually no effect on the seasons.” a. True 11. What is the cause of the seasons? a. The tilt of the Earth’s axis cause different portions of the Earth to receive more or less direct sunlight at different times of year.