AS101 - Module 1

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School

Wilfrid Laurier University *

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Course

101

Subject

Astronomy

Date

Feb 20, 2024

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pdf

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Uploaded by ChiefThunderCrane8

Question 1 What is an Astronomical Unit (AU)? % ‘@ The average distance between the Sun and the Earth. 1.5 x 108 kilometres (km). 1.5 x 1012 centimetres 150 million kilometres - All of the rest Question 2 What is the largest object in the solar system? Earth, of course Neptune Ceres, the largest asteroid in the asteroid belt Jupiter « o The Sun Question 3 The solar system consists of The inner planets (Mercury, Mars, Earth, Venus) plus the Sun + o The Sun and its planets, asteroids and comets The Sun plus the asteroids and comets All of the stars in our galaxy The Sun, Moon and stars in our galaxy Question 4 Which of the following best describes the Milky Way Galaxy? a spiral galaxy with a disk about 80,000 light-years in diameter and containing about 100,000 stars a spherically shaped collection of about 10 billion stars that is about 100 light-years in diameter o aspiral galaxy with a disk about 80,000 light-years in diameter and containing between 100 billion and 1 trillion stars a spiral galaxy with a disk about a billion kilometres in diameter and containing between 100 million and 1 billion stars a spherically shaped collection of stars including our solar system and about a dozen other solar systems, stretching about 4 light-years in diameter Question 5 Which of the following has your "address" in the correct order? ymj, Earth, solar system, Local Group, Milky Way, Local Supercluster you, Earth, Local Group, Local Supercluster, solar system, Milky Way v o you, Earth, solar system, Milky Way, Local Group, Local Supercluster you, Earth, solar system, Local Group, Local Supercluster, Milky Way you, Earth, solar system, Milky Way, Local Supercluster, Local Group WL EEN,

Question 6 Which of the following statements about the sizes of stars is most true? v o Rigel, the bluish star representing the left foot of Orion, is considerably larger than the Sun. All stars in our galaxy are about the same size. The largest known star, VY Canis Majoris, is about 5 times larger than the Sun. Antares, the brightest star in the constellation Scorpius, is bigger than Earth but smaller than the Sun. - The Sun is one of the bigger stars in our galaxy. Question 7 On the Cosmic Calendar (where the age of the universe in condensed into the equivalent to one calendar year) most of recorded history takes up what portion of the "year"? the last few weeks of the year the last few months of the year the last few minutes of the year « o the last few seconds of the year. the last few days of the year Question 8 On the Cosmic Calendar when did the big bang occur? March 21 December 31 December 25 September 1 « » January 1 Question 9 Which of the following objects within our solar system is the smallest? % (@ Mercury o Moon Mars Neptune Earth Question 10 If you looked at an area 10,000 light-years across, centered on the Sun, which of the following would NOT be in your field of view? The solar system - The entire Milky Way galaxy »% o The closest stars to the Sun. The spiral arm that contains the Sun The stars, nebulae and gas near the Sun

Question 11 What is a light-year? The time is takes light to travel halfway across the Milky Way galaxy. The time is takes light to get to the nearest star, Proxima Centauri. The average distance between the Sun and the Earth. v e The distance light travels in one year. The time for light to travel to Earth from the Andromeda galaxy. Question 12 On the Cosmic Calendar all of recorded history occurred beginning when? December 31 around noon December 1 v o December 31 within the last minute of this last day of the year. December 25 December 30 around noon Question 13 . Which of the following is furthest from the Sun? an asteroid in the asteroid belt Pluto « o acomet in the Oort cloud Neptune a comet in the Kuiper belt Question 14 Which of the following is largest? 1 Astronomical Unit 1 light-year size of Pluto's orbit v o size of a typical galaxy distance to the nearest star (other than our Sun) Question 15 Which of the following objects in our solar system is farthest from the Sun? Mercury Jupiter (it is the largest, after all) Mars v o Neptune the Moon

Question 16 The order of the planets beyond Earth, away from the Sun, is Ve Mars, Saturn, Jupiter, Neptune, Uranus Venus, Mars, Jupiter, Saturn, Uranus, Neptune Mars, Venus, Jupiter, Saturn, Neptune Mars, Jupiter, Saturn, Uranus, Neptune Mars, Ceres, Jupiter, Saturn, Neptune, Uranus Question 17 The distance across our galaxy in light-years is closest to 1,000,000 1,000 + o 100,000 10,000 10,000,000 Question 18 Each cycle of the Earth's precession takes about = 26,000 years None of the others. 2,600 light-years i % (@ 26,000 light-years 2,600 years Quesfion 19 What conditions are required for a solar eclipse? The phase of the Moon must be new, and the Moon's orbital plane must lie in the ecliptic. The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with the Earth and the Sun. The phase of the Moon can be new or full, and the nodes of the Moon's orbit must be nearly aligned with the Earth and the Sun. The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with the Earth and the Sun. The phase of the Moon must be full, and the Moon's orbital plane must lie in the ecliptic. Question 20 You are standing on the Earth's equator at midnight. Which way is Polaris, the North star? ve right on the northern horizon due north directly overhead at your zenith 50 degrees up, due East The answer depends on whether its winter or summer. 23.4 degrees above the North Pole, along the meridian.

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