GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Elliptical
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Spiral
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Irregular
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None of the above
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Detailed explanation-1: -Spiral galaxies contain both old and young stars, as well as interstellar matter, and have typical masses in the range of 109 to 1012MSun. Our own Galaxy is a large spiral. Ellipticals are spheroidal or slightly elongated systems that consist almost entirely of old stars, with very little interstellar matter.
Detailed explanation-2: -They’re found in the halo, a roughly spherical component of the galaxy that formed first, in which old stars move in orbits that are highly elongated and tilted. Younger stars in the Milky Way rotate together along the galaxy’s disc in roughly circular orbits, much like horses on a merry-go-round.
Detailed explanation-3: -Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars.