
It doesn't look like much, does it? Compared to the other images we have shared on this site, the above photo is rather, well, dull. When you saw it, you probably shrugged your shoulders, rolled your eyes, yawned, and thought, "Big deal. A fuzzy cloud of gas. Is that little dot in the center a star? Show me something good. Show me something
impressive."
Well, that little dot in the center of that gaseous, hazy cloud is Canis Majoris--the Big Dog Star.
Canis Majoris, a red hypergiant star in the Canis Major constellation, is located about 5,000 light years from Earth.
So, how
big is the Big Dog?
Canis Majoris is approximately 2,600 times the size of our sun. This might help put things into perspective. A person walking at 3 miles per hour (an average pace), for 8 hours per day (a lot of walking), would take 2 years and 11 months to circle Earth. Not a bad accomplishment. The same person, walking at the same speed and the same number of hours each day, would take 310 years and 7 months to circle the Sun. Of course, this is a physical impossibility since, at the most, a person will live for 120 years.
So, how long would it take for a person to circle Canis Majoris?
650,000 years!Not a visual learner? Need another picture or two in order to grasp the enormity of the largest star known to man? How about this. Canis Majoris is the size of Saturn's orbit around the Sun.
Light (traveling at 186,000 miles per second) takes approximately 8 minutes to travel from the Sun to Earth. Canis Majoris is so large that light takes
8 hours to travel around the star's circumference.
Canis Majoris is so large that it can fit 7 quadrillion Earths inside it. A quadrillion is 1,000 trillion. Think of it this way. If the Earth was a golf ball, Canis Majoris would be the size of Mount Everest.
If you haven't said "Whoa!" yet, take a minute to watch this video.
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