What is the best method commonly used to detect Earth-sized extrasolar planets with the telescopes and instrumentation that exist today?
A) Doppler shift
B) transit
C) direct imaging
D) microlensing

Question

Quizplus · Accepted Answer

The most effective method to detect Earth-sized extrasolar planets with current telescopes and instruments is transit because it involves measuring the decrease in the brightness of a star as a planet passes in front of it, revealing the planet's size, orbital period, and distance from the star. This method has been successful in detecting many Earth-sized planets orbiting nearby stars. The other methods, Doppler shift, direct imaging, and microlensing, are less effective in detecting Earth-sized planets with current technology.

What Is the Best Method Commonly Used to Detect Earth-Sized