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How big is Arcturus?

Updated: 10/4/2023
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14y ago

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Arcturus is a red supergiant with a radius 25 times larger than our Sun.

If our Sun was replaced by Arcturus it's outer edges would reach beyond Mars. See related link for a pictorial representation.

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14y ago
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14y ago

Arcturus is 36.7 light years from Earth. As a light year is a measurement of the distance travelled by light in one year, this distance directly translates to the time taken for light to reach us from Arcturus; slightly less than 37 years.

In other words, if you look toward Arcturus on your 37th birthday, the light that reaches your eye actually left Arcturus around the time that you were born. In astronomical terms, that's a short walk to the corner shop.

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