Uranus probably has rings because something
collided with it and left debris in orbit, and
these debris collected to become the rings. Please
read the answer
here, where we already explain why some
planets have rings.
It is difficult to say exactly what would happen
if Venus did not exist. In the shorter term,
Venus, along with Jupiter, is one of the major
planets that Earth interacts with
gravitationally. These gravitational effects
cause changes in the Earth's orbit over
time periods of tens of thousands of years. Ice
ages on Earth result from such changes in
If Venus weren't there, we might not have
In longer time scales, it's difficult to say.
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