Space has rocks?

Comets and Asteroids

Asteroid

a small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles (1,000 km) across (Ceres) to dust particles, are found (as the asteroid belt ) especially between the orbits of Mars and Jupiter, though some have more eccentric orbits, and a few pass close to the earth or enter the atmosphere as meteors.
A space telescope to thwart deadly asteroids

NASA has an eye on the sky for massive asteroids, the kind that could turn our planet to pulp. So they need donations for a telescope that can keep tabs on these deadly asteroids.

What is the difference between A meteor, a meteorite, and and Asteroid?

A meteorite is the piece of rock left behind after a Meteor doesn't burn up before reaching Earth. A meteor is a streak of light seen in the sky like "shooting star" while the rock is burning up. An Asteroid is a space rock in orbit between Jupiter and Mars usually bounced towards Earth.

Comet

a ball of frozen gases, rock and dust that is about the size of a small town. Comets orbit the sun. Jets of gas and dust from comets form long tails that can be seen from Earth. In the distant past, people were both awed and scared by Comets. People thought they would crash into Earth but NASA research has confirmed there is no chance that could ever happen. The "tail" on the end of the Comet is actually the rock burning up and as it shoots across the sky, the light is pushed to the back from the wind against it.
Comets - Remnants Of The Beginning

Cited Sources

"Infographic: What’s the Difference Between a Comet, Asteroid and Meteor?"Infographic: What’s the Difference Between a Comet, Asteroid and Meteor? N.p., n.d. Web. 09 Dec. 2014. <http://www.universetoday.com/100075/infographic-whats-the-difference-between-a-comet-asteroid-and-meteor/>.

"Asteroids: Fun Facts and Information About Asteroids." Space.com. N.p., n.d. Web. 09 Dec. 2014. <http://www.space.com/51-asteroids-formation-discovery-and-exploration.html>.

"Planets." Solar System Exploration. N.p., n.d. Web. 07 Dec. 2014. <https://solarsystem.nasa.gov/planets/>.