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Lionel Young, age 74, Launceston, Tasmania This is a fantastic question Lionel, and a really good observation! When we look out at the Solar System, we see objects of all sizes from tiny grains of dust, to giant planets and the Sun. A common theme among those objects is the big ones are (more or less) round, while the small ones are irregular. But why? A variety of the Solar System’s small bodies, to scale. Bigger objects are round, but the small ones are anything but! Wikipedia/Antonio Ciccolella Gravity: the key to making big things round … The answer to why the bigger objects are round boils down to the influence of gravity. An object’s gravitational pull will always point towards the centre of its mass. The bigger something is, the more massive it is, and the larger its gravitational pull.

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