Questions on Celestial Coordinate System
1. As seen from temperate or tropical latitudes, the positions of the constellations shift gradually westward in the sky from night to night because
(a) the Earth rotates on its axis.
(b) the Earth revolves around the Sun.
(c) the tilt of the Earth’s axis changes.
(d) their right ascensions constantly change.
(e) their declinations constantly change.
2. A star cluster in which the individual stars do not show a striking central concentration nor an orderly pattern or structure is called
(a) a thin cluster.
(b) an open cluster.
(c) a nebulous cluster.
(d) a globular cluster.
(e) a random cluster.
3. An average star such as our Sun will, it is believed, eventually end up as
(a) a blue dwarf.
(b) a black hole.
(c) a proton star.
(d) a pulsar.
(e) a black dwarf.
4. an imaginary line connecting any planet with the Sun
(a) revolves around the Sun at a constant angular rate.
(b) is always the same length.
(c) is longest when the planet moves fastest.
(d) sweeps out equal areas in equal periods of time.
(e) is constantly getting longer.
5. A radio galaxy
(a) is more radioactive than a typical galaxy.
(b) is a galaxy that can be observed only at radio wavelengths.
(c) is a galaxy that emits an unusually large amount of energy at radio wavelengths.
(d) is a galaxy that emits radio signals that sound like they come from an intelligent civilization.
(e) is a galaxy to which we have sent radio signals in the hope of contacting extraterrestrial civilizations.
6. Total internal reflection can occur for a light beam
(a) striking a pane of glass from the outside.
(b) passing through a pane of glass at a right angle.
(c) striking the surface of a prism at a grazing angle from the inside.
(d) traveling from one place to another through a vacuum.
(e) under no circumstances.
7. The distance from the Earth to the Moon is approximately
(a) 3 times Earth’s diameter.
(b) 10
(a) the Earth rotates on its axis.
(b) the Earth revolves around the Sun.
(c) the tilt of the Earth’s axis changes.
(d) their right ascensions constantly change.
(e) their declinations constantly change.
2. A star cluster in which the individual stars do not show a striking central concentration nor an orderly pattern or structure is called
(a) a thin cluster.
(b) an open cluster.
(c) a nebulous cluster.
(d) a globular cluster.
(e) a random cluster.
3. An average star such as our Sun will, it is believed, eventually end up as
(a) a blue dwarf.
(b) a black hole.
(c) a proton star.
(d) a pulsar.
(e) a black dwarf.
4. an imaginary line connecting any planet with the Sun
(a) revolves around the Sun at a constant angular rate.
(b) is always the same length.
(c) is longest when the planet moves fastest.
(d) sweeps out equal areas in equal periods of time.
(e) is constantly getting longer.
5. A radio galaxy
(a) is more radioactive than a typical galaxy.
(b) is a galaxy that can be observed only at radio wavelengths.
(c) is a galaxy that emits an unusually large amount of energy at radio wavelengths.
(d) is a galaxy that emits radio signals that sound like they come from an intelligent civilization.
(e) is a galaxy to which we have sent radio signals in the hope of contacting extraterrestrial civilizations.
6. Total internal reflection can occur for a light beam
(a) striking a pane of glass from the outside.
(b) passing through a pane of glass at a right angle.
(c) striking the surface of a prism at a grazing angle from the inside.
(d) traveling from one place to another through a vacuum.
(e) under no circumstances.
7. The distance from the Earth to the Moon is approximately
(a) 3 times Earth’s diameter.
(b) 10