The answer to why the bigger objects are round boils down to the influence of gravity. 🕴
"I'm puzzled as to why the planets, stars and moons are all round other large and small objects such as asteroids and meteorites are irregular shapes?"This is a fantastic question Lionel, and a really good observation!, 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 round, while the small ones are irregular.
For solid objects, that force is opposed by the strength of the object itself. For instance, the downward force you experience due to Earth's gravity doesn’t pull you into the center of the If Earth were made entirely from ocean, Mount Everest would just sink down all the way to Earth's center . Any areas where the water was unusually high would sink, pulled down by Earth's gravity. Areas where the water was unusually low would be filled up by water displaced from elsewhere, with the result that this imaginary ocean Earth would become perfectly spherical..
Meanwhile, an object made of of pure iron would need to be much more massive for its gravity to overcome the inherent strength of the iron. In the solar system, the threshold diameter required for an icy object to become spherical is at least 400 kilometers — and for objects made primarily of stronger material, the threshold is even larger., which looks like the Death Star, is spherical and has a diameter of 396 km. It’s currently the smallest object we know of that may meet the criterion.
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