The antiparticle and particle have exactly the same mass and so are affected by gravity in the same way. Apollo missions NASA's Apollo space program ran from 1961 to 1975. The mission goal and accomplishment was to put man on the moon. Asteroid Metallic, rocky objects without atmospheres that orbit the Sun, but are too small to be called planets . A group of these objects make up the asteroid belt between Mars and Jupiter.
Scientist believe that asteroids are pieces of the material that formed the solar system .
The scientific study of the universe around us, everything outside of the Earth's atmosphere . The part of astronomy dealing with the physics and chemistry of astronomical objects and events. The mixture of gases that surround a planet, moon or star, held near it by gravity. Atom A basic unit of matter. It is the smallest particle of an element that still has the characteristics of that element.