The Moon

The closest to Earth is the moon which is considered the natural satellite of the Earth because it orbits around the Earth due to the gravitation force of the Earth on the moon.

Source: http://newswiseblog.blogspot.com/2009_05_01_archive.html

The Earth

Source: http://www.softpedia.com/progScreenshots/Earth-3D-Space-Tour-Screenshot-5607.html

The earth is the third planet away from the sun, and it is the eight largest planets. It is the only place in the Universe where life exists, home to millions of species, including humans. It has water in abundance. It turns around the sun every 365.25 days.

It is sometimes referred to as the Blue Planet or the World.