Astronomy Exam 2023 with correctly answered questions

What does the universe look like from Earth? With the naked eye we can see more than 2000 stars including the Milky Way Why do stars rise and set? The Earth rotates west to east, so the stars appear to circle from east to west. Why do the constellations we see depend on latitude and time of year? They rotate? What is a constellation? A region in the sky. Remember: The locate of any point on a map of the US is in some state, and the location of any point in the sky is in some constellation How many constellations are there? 88 What is the Celestial Sphere? The illusions of all the stars lying at the same distance in the constellations allows us to define the celestial sphere. 88 official constellations appear to cover the celestial sphere What is the "ecliptic" of the celestial sphere? The Sun's apparent path through the celestial sphere. What is the celestial equator? It divides the celestial sphere into the north celestial pole and the south celestial pole. Which of the following is not included in the celestial sphere? a. North celestial pole b. South celestial pole c. West celestial sphere d. Ecliptic C How do we use the term "Milky Way"? -band of light in the sky -Name of our galaxy What galaxy are we located within? The Milky Way What do we see when we look out of the galactic plane? We have a clear view of the distant universe What do we see when we look into the galactic plane? We see the stars and interstellar clouds that make up the Milky Way in the night sky. True or false: the altitude of zenith is always 90 degrees. True If something is directly overhead of the observer it is ______. zenith All points 90 degrees from zenith are called _______. horizon What is the meridian? The line that passes through the zenith and connects the north and south points on the horizon. How do you specify a specific location of something in your local sky? By its altitude (above horizon) and its direction (along horizon) What do we call the imaginary half circle that stretches from the horizon due south, passes through the zenith, to the horizon due north. meridian Why can we only measure angular sizes and distances of objects in the sky? We lack depth perception in space How do we measure objects in the sky? We use angles 1º = ? 60' (arcminutes) 1'= ? 60" (arcseconds) The angular size of your finger at arm's length is about 1°. How many arcseconds is this? 60 x 60 = 3600 arcseconds Angular size= Physical size x (360 degrees/_______ 2pi x distance What does this equation prove? Angular size= Physical size x (360 degrees/2pi x distance An object's angular size appears smaller if it is farther away Stars near the north celestial pole are circumpolar, which means they__________. Never set We can see stars near the south celestial pole. a. True b. False c. Partially true. We can see them if we are somewhere south of the equator. b. false True or false: With exception of Earth and circumpolar stars, all other stars, the Sun, the Moon, and other planets rise in the east and set in the west. true Longitude position east or west of prime meridian Latitude position north or south of the equator