What are the two primary methods by which planets have been found around other stars in our galaxy? I)Direct images in visible and infrared light
II)Indirectly by detecting the motion of the host star
III)Indirectly by measuring the drop in brightness of the host star when the planet crosses our line of sight
A)I and II
B)II and III
C)I and III

Question

Quizplus · Accepted Answer

The two primary methods by which planets have been found around other stars in our galaxy are indirectly by detecting the motion of the host star (method II) and indirectly by measuring the drop in brightness of the host star when the planet crosses our line of sight (method III). Direct images in visible and infrared light (method I) are also used but are less common and have only been successful for larger planets that are far from their host star.

What Are the Two Primary Methods by Which Planets Have