Sun's path in Milky Way

Sun's Orbit

All the celestial bodies in the universe are moving around another body. This is called orbiting. Moon is moving around the Earth. Again Earth and other planets are moving around the Sun. Is the Sun the centre of the Universe? The answer is certainly 'no'. Sun is also moving around some bigger object. Sun is orbiting the centre of the Milky Way Galaxy. We do not know exactly, what is at the centre of the Milky Way Galaxy. Perhaps there is one Micro-Quasar with a super massive Black Hole.
Sun's Location in the Milky Way
Sun is one of the stars in the Milky Way. There are about 300 billion stars in this Galaxy. Sun is situated in this Galaxy more than 1/2 way away from the centre towards the edge or end of the Galaxy.
The Milky Way Galaxy is our home galaxy in the universe. It contains the Solar System. It is a barred spiral galaxy and is 13.2 billion years old or as old as the universe itself. The Milky Way is a part of the Local Group of galaxies.
Milky Way Galaxy is 100,000 light years in diameter.50, 000 light years in radius.1000 light years thick.
Sun's Orbit
Sun is situated about 26,000 to 30,000 light years from the galactic centre. Circumference of the of the Sun's orbit is about 150,000 light years. Sun is moving at the speed of 782,000 km/hour or 486,000 m/hour. Sun completes one orbit in 225 to 250 million years. This is known as one Galactic year or one cosmic year. Sun is about 5 billion years old. So it has completed about 20 to 22 orbit from its birth. Sun's orbit around the Galactic Centre is roughly elliptical with the additional perturbations due to the galactic spiral arms and non uniform mass distributions. In addition, the Sun oscillates up and down relative to the galactic plane approximately 2.7 times per orbit. In its motion through the Milky Way, Sun is moving in the general direction of the Star Vega.
Sun's movement through the Milky Way regularly sends comets hurtling into the inner solar system. Sun bounces up and down through the plane of the Galaxy and dislodges comets from their paths. Some of them collide with the Earth. Scientists believe that comets' collision with the Earth may have caused mass extinction of life on Earth. Dinosaurs may have been extinct due to the same cause about 65 million years ago. Our present position in the Galaxy suggests that we are now very close to another such period.
There is a hypothesis that while "Bounce" effect may have caused extinction of life in one place, it may also have helped in the spread of life in another place. The impact of comets' collision may have thrown debris containing micro-organisms out into space across the universe.

The writer is an Advocate of the Supreme Court.