Comets get significantly brighter in our skies as they approach the Sun because
A) they reflect more sunlight as they get closer to the source of light
B) they get bigger as the ice evaporates
C) they get closer to the Earth than when they were outside the orbit of Mars
D) they move faster and faster
E) more than one of the above

Question

Quizplus · Accepted Answer

Comets get brighter in our skies as they approach the Sun due to a combination of factors. As they get closer to the Sun, they also get closer to Earth, making them appear brighter. Additionally, as the ice and other volatile materials on the comet's surface heat up, they evaporate and release gas and dust, forming a glowing coma and tail that reflects sunlight and makes the comet appear brighter. Finally, as the comet approaches the Sun, it may also speed up due to the Sun's gravitational pull, but this is not the primary factor contributing to its increased brightness.

Comets Get Significantly Brighter in Our Skies as They Approach