The Herschels' grindstone model of the Milky Way star system was too small because
A)they did not count the brightest stars.
B)they did not study the southern sky.
C)they did not have large enough telescopes.
D)they only observed stars in the disk of the galaxy and not the halo.
E)they did not know about interstellar dust clouds.

Question

Quizplus · Accepted Answer

The Herschels' model was too small because they did not account for interstellar dust clouds, which obscure and dim the light from distant stars, leading to an underestimation of the galaxy's size.

The Herschels' Grindstone Model of the Milky Way Star System