What combination of forces releases the gas and dust of a comet when it approaches the Sun?
a. radiation pressure and electromagnetic energy
b. electromagnetic energy and solar wind
c. solar flares and nuclear fission
d. gravitational energy and solar wind
e. solar wind and radiation pressure
Question 2
Any star that is more luminous than the Sun, but has the same temperature as the Sun, is a(n) ____.
a. pulsating star
b. white dwarf
c. zero age main sequence star
d. giant
e. brown dwarf