57. Q. How many moons has Neptune? A. One, and probably two.
58. Q. What is the length of the year on Neptune? A. A little over one hundred and sixty four of our years.
59. Q. When was Neptune discovered? A. In 1846.
60. Q. By what name is the scientific theory known which attempts to state the method by which the solar system came into its present form? A. The nebular hypothesis.
61. Q. How are the stars in a constellation indicated? A. The brightest stars are indicated in order by the letters of the Greek alphabet. After these are exhausted the Roman alphabet is used in the same manner, and then numbers are employed.
62. Q. What have many of the brightest stars also received? A. Proper names by which they are known.
63. Q. Around what star do the stars of the northern circumpolar region appear to revolve? A. Polaris, the North Star.
64. Q. Name five northern circumpolar constellations. A. Ursa Major, or the Great Bear; Ursa Minor; Cepheus; Cassiopeia, or the Lady in the Chair; and Perseus.
65. Q. When are the circumpolar constellations visible in northern latitudes? A. They are always visible.
66. Q. How many stars does the constellation of Ursa Major contain that are visible to the naked eye? A. One hundred and thirty-eight.