The large majority of spiral galaxies are flat, rotating disks. Within the disk, there are stars, dust, and gas. The disk also contains spiral arms and a central concentration of stars known as the bulge of the galaxy.
<span> The hypothesis is an idea that suggests how things work in nature.
The main way the hypothesis is going to help you is by testing it,
scientists can (most of the time) set up tests to verify is the
hypothesis is possible or not, still that doesn't mean that the
hypothesis is true. If the hypothesis is possible(likely to be right)
and is the more likely to happen, it is said to be an accepted
hypothesis. Hope this helps!!</span>
Answer:
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Explanation:
