Why do some planets like Saturn and Jupiter have rings, while the Earth doesn't have any?
by 
Doggie S
ANSWERS: 4
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I guess that's the way they were formed
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It's known as the Accretion Theory. When you have a large mass inside a cloud of debris, usually a star, the debris will form a disc around the large mass caused by centrifugal force. The debris will move under its own momentum and through the rotation of the large mass. Over milliards of years the debris will clump together to form planets/moons. The rings around Saturn and Uranus are still very much in their early stages of accretion (the debris hasn't clumped together yet). Neptune's rings have almost reached the end of accretion and Jupiter pretty much has reached the end (it has moons and no disc). Earth doesn't have any discs because it just didn't have enough debris around itself to gather together to have discs.
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Because earth doesnt have enough gravity(E=mc2)
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All the Jovian planets have ring systems and they all have formed in similar but different ways. The rings of Uranus for example are thought to be relatively young, at not more than 600 million years old. The Uranian ring system probably originated from the collisional fragmentation of a number of moons that once existed around the planet. After colliding, the moons probably broke up into numerous particles, which survived as narrow and optically dense rings only in strictly confined zones of maximum stability. This process is likely to produce a much more prominent ring system around Neptune in the future. If the moon broke apart or suffered a large collision it is likely Earth would have rings
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