OUR SUPER STAR-THE SUN

The sun and its speed

The sun is the basic source of life on earth, earth and all other planets revolves around it, but does sun also revolves around something?? 

The answer is yess!!

It revolves around our galaxy, the milky way, and its speed of revolution is 220   km per second!, it sounds insane , but its true, but even at this speed itt takes about a million years to go around once, because the galaxy is so large. Humanity has not been around even for one revolution! It is useful to know that the matter and stars in the galaxy take on a spiral shape.

By analyzing the differential rotation of the stars as a function of distance from the centre of the galaxy, astronomers have concluded that besides the visible stars and clouds, there must be a lot more invisible matter that exerts a gravitational force on the visible matter in the galaxy. This invisible matter is referred to as the so-called dark matter. We still do not know the nature or identity of this matter.

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