When viewed through an optical telescope, planetary nebula___________ .
A) have visible planets within their cloud of debris
B) are spherical in form and often have "rings" like Saturn
C) look like giant planets such as Jupiter
D) show the explosive form of the dead sun
E) still have planets orbiting the cloud

Question

Quizplus · Accepted Answer

Planetary nebulae are named for their round, planet-like appearance when viewed through small optical telescopes, not because they contain planets. They are actually the outer layers of gas expelled from stars, glowing due to the ultraviolet radiation from the central star.

When Viewed Through an Optical Telescope, Planetary Nebula___________