A galaxy cannot have a disk if it does not have gas.
As a kind of galaxy that Edwin Hubble first identified in his 1936 book The Realm of the Nebulae, spiral galaxies are a component of the Hubble sequence. The majority of spiral galaxies are made up of a bulge, or core collection of stars, and a flat, revolving disc filled with stars, gas, and dust.
A halo of stars, many of which are found in globular clusters, surrounds many of these objects.
A spiral galaxy called the Pinwheel Galaxy is around 21 million light-years away from Earth. Scientists have given this whirling galaxy the moniker M101.
It is located in the constellation Ursa Major, widely known as the "Big Dipper," in the Northern Hemisphere. A tiny telescope or a pair of binoculars can be used to check the sky's clarity and darkness.
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