Concerning the planetary orbits, why was copernicus somewhat inaccurate?

This is astronomy not biology,

But anywho, From what I can remember, Copernicus's heliocentric theory stated that the planets orbited in perfectly circular orbits. In reality, they are shaped like ellipses (ovals). 

True

Explanation:

The universe is a vast area for exploration. It is associated with hidden dangers. If we consider the solar system it consists of comets and asteroids which can impact on the space exploration devices such as spacecrafts, can make human life risky in space.

The vacuum of the space is not suitable for human beings. The astronauts must adapt to the atmosphere outside the earth. Then there is a risk of encounter with the alien life in space or any other planet also exists.