Our Universe : Twinkle, Twinkle, Little Star ! by T Pakshirajan

Our Universe : Twinkle, Twinkle, Little Star ! by T Pakshirajan

By T Pakshirajan

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Example text

The period may vary from star to star. Such stars are known as 'variable stars'. We shall later meet them in their world. In the early part of this century, an astrophysicist in the U . S . A . , Dr. Charles Greeley Abbot (1872-1973), after a careful research, made a revelation that the Sun may, in reality, be a variable star, probably with a very small range of variation in an eleven-year period. This finding is yet to be confirmed. The head of the solar family has immense powers and innumerable surprises.

Worthy of its name, the planet looks extraordinarily bright and beautiful, and is hailed by people as the Morning and Evening Star. It shines 15 times brighter than even Sirius, the brightest of all stars known to us. Astronomers say that the planet Venus will look like a crescent moon from far away. When Galileo first observed Venus, he noticed its phases—a phase being the gradual increase and decrease of the area of brightness visible from the Earth. The orbit of Venus lies at a mean distance of 1 0 8 x l 0 6 kilometres from the Sun.

The Sun's circumference is roughly calculated as 4,160,000 kilometres. 2xl0 27 tons. The Sun is so huge a 'container' that you can easily pack 13 lakh Earths into it and still some room will remain! There is no comparison at all between the Sun's and the Earth's surface gravity, which is 28 times greater on the Sun. In other words, a person who can lift 50 kilograms on Earth would be crushed by its weight on the Sun as it would weigh 1,400 kilograms there. It is no wonder that, possessed with such a mighty force, the Sun has easily, for millions of years, kept under its perpetual control, all the • major and minor planetary bodies, even the remotest planet, Pluto, lying at a distance of 590 crore kilometres.

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