PHY 150 NOVA ASTRONOMY MIDTERM Exam Questions with correct answers

PHY 150 NOVA ASTRONOMY MIDTERM Exam Questions with correct answers Which of the following statements about the celestial sphere is not true? a) The Earth is placed at the center of the celestial sphere. b) The "celestial sphere" is another name for our universe. c) When we look in the sky, all stars appear to be located on the celestial sphere. d) The celestial sphere does not exist physically. - B. Not another name for our universe, but an imaginary device for locating objects by their direction in the sky. an angle of 1 arcsecond is [blank]. - B. Less than the thickness if a human hair held at arm's length. There are 60 arcminutes in 1 degree and 60 arcseconds in 1 arcminute, 3,600 arcseconds in 1 degree. 1 degree is about the width of a finger at arm's length, you'll see that 1 arcsecond is indeed about the width of a human hair at arm's length.