Helioseismology is the study of the solar interior using observations of waves on the Sun's surface. It has done much to improve our understanding of the interior of the Sun, testing the physical inputs used to model stellar interiors and providing a detailed map of the Sun's structure and internal rotation.
The ball with which Table Tennis is played is called Ping Pong Ball.
According to the International rules, the diameter of the ping pong ballmust be not less than 39.5 millimeters and not greater than 40.5 millimeters having a mass of 2.7 grams.
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