In a recent survey of stars in the sky,it was found that occasionally a star that is normally of constant brightness will slowly brighten and then fade back to its original brightness again over the space of several weeks.What is believed to be the cause of this change in brightness?

Question

Quizplus · Accepted Answer

This phenomenon is known as microlensing, and it occurs when a compact object such as a brown dwarf passes in front of the star and bends its light, causing it to briefly appear brighter. The duration and shape of the brightness change can provide information about the mass and distance of the lensing object. Options A, B, and D do not explain this specific phenomenon of a star's brightness gradually changing over several weeks.

In a Recent Survey of Stars in the Sky,it Was