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The proportions of barred spirals relative to unbarred spirals likely have changed throughout the history of the universe, with only about 10% containing rods about 8 billion years ago, to about a quarter of 2.5 billion years ago.
Barred spiral galaxies account for approximately 18% of all the galaxies that have been discovered. Examples are NGC 1365 in the constellation Fornax and NGC 1300.
About Barred Spiral Galaxy
A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure consisting of a star at its center. This rod can be found from half of all spiral galaxies. Bars generally affect the movement of stars and interstellar gas within spiral galaxies and can also affect spiral arms. The Milky Way galaxy, in which the solar system is located, is classified as a barred spiral galaxy.
Edwin Hubble classifies this type of spiral galaxy as "SB" (spiral, barred) in the Hubble classification and arranges them into sub-categories or sub-groups based on how open the spiral arms are.
Learn more about spiral galaxy at https://brainly.com/question/28644362.
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