* Kepler is not a planet. Kepler refers to the Kepler Space Telescope, a spacecraft that was launched to find exoplanets (planets outside our solar system).

* Planet Earth is our home planet, a massive ball of rock and water.

So, in terms of size, Planet Earth is much bigger than the Kepler Space Telescope.

However, the Kepler Space Telescope has been incredibly successful in finding thousands of exoplanets, many of which are much larger than Earth.