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How Long Does it Take the Sun to Orbit the Center of our Galaxy?

1 Nov 2015, 15:07 UTC
How Long Does it Take the Sun to Orbit the Center of our Galaxy?
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Question: How long does it take our sun to complete a full orbit around the super blackhole at the center of the Milky Way? – Dustin
Answer: We can calculate this value by noting that the Sun is about 8 kilo-parsecs, or about 2.5×10^(17) km, from the center of our galaxy and travels at a speed of about 225 km/sec around the center of the galaxy. Assuming that the Sun’s orbit about the center of the galaxy is circular, we know that the circumference of that circular orbit is 2*pi*r, where r is the distance from our Sun to the galactic center. Since distance = rate * time, we know that time = (2*pi*r)/rate = (2*pi*2.5×10^(17) km)/220 km/sec =~ 225 million years.
Jeff Mangum

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