The most likely places in which stars and planetary systems are forming in the universe are
A) the rarified outer space between galaxies.
B) regions of hot gas in the spiral arms of galaxies.
C) gas and dust nebulae.
D) the centers of galaxies.

Question

Quizplus · Accepted Answer

Gas and dust nebulae are the most likely places for stars and planetary systems to form as these clouds of gas and dust are dense enough to allow for the gravitational collapse that leads to the formation of stars. These nebulae are often found within galaxies, particularly in regions of active star formation such as the spiral arms. The rarified outer space between galaxies is too diffuse for this process to occur, and while regions of hot gas in the spiral arms may contain the necessary materials, they are not as dense as the gas and dust nebulae. The centers of galaxies may also contain dense gas clouds, but the intense radiation and gravitational forces present there can disrupt the formation of stars and planetary systems.

The Most Likely Places in Which Stars and Planetary Systems