Universe MCQs

66. What is the name of the process by which a planet or moon loses its atmosphere due to solar wind or other factors?
a) Accretion
b) Erosion
c) Volcanism
d) Escape

67. What is the name of the phenomenon where a planet or moon appears to move backwards in its orbit?
a) Retrograde motion
b) Direct motion
c) Opposition
d) Conjunction

68. What is the name of the star that is at the center of our solar system?
a) Sirius
b) Proxima Centauri
c) Betelgeuse
d) Sun

69. What is the name of the process by which a gas becomes a liquid or solid?
a) Condensation
b) Evaporation
c) Sublimation
d) Fusion

70. What is the name of the process by which a liquid becomes a gas?
a) Condensation
b) Evaporation
c) Sublimation
d) Fusion