Where have astronomers observed the existence of planets?
A) in our Solar System
B) orbiting stars other than the Sun
C) orbiting stars in binary systems
D) traveling on their own through the Milky Way, not orbiting a star
E) all of these

Question

Quizplus · Accepted Answer

Astronomers have observed planets in our Solar System, orbiting other stars (exoplanets), in binary systems, and rogue planets traveling through the Milky Way without orbiting a star.

Where Have Astronomers Observed the Existence of Planets