In the formation of our Galaxy, the ________ formed first.
A)Galactic disk
B)Galactic center
C)globular clusters
D)planetary nebulae
E)spiral arms

Question

Quizplus · Accepted Answer

The globular clusters are the oldest objects in our galaxy and formed first in the Milky Way's halo. The Galactic center, galactic disk, spiral arms, and planetary nebulae came later in the formation process. According to current models, the formation of the Milky Way galaxy began with the collapse of a giant cloud of gas and dust approximately 13.6 billion years ago. In this process, dense regions within the cloud began to collapse under the force of gravity, forming small clumps of gas that eventually became the first stars. These first stars are thought to have formed in the central region of the galaxy, and over time they gravitationally attracted more gas and dust to form the globular clusters that comprise the oldest parts of the Milky Way. The other components of the galaxy's structure, such as the disk, spiral arms, and central bulge, are all thought to have formed later as the galaxy continued to evolve over time.

In the Formation of Our Galaxy, the ________ Formed First