Strong evidence for the existence of planetary systems in the process of formation around other stars comes from
A) spectroscopic evidence of large quantities of molecules such as ammonia and methane, which can exist only in planetary atmospheres.
B) images and infrared observations of disks of dust.
C) detection of very regular pulses of radio energy from some stars.
D) direct photography of actual planets near other stars.

Question

Quizplus · Accepted Answer

Images and infrared observations of disks of dust around young stars are considered strong evidence for the existence of planetary systems in the process of formation. These disks, often called protoplanetary disks or circumstellar disks, are regions where planets can form from the accretion of dust and gas.

Strong Evidence for the Existence of Planetary Systems in the Process