examples of space probes 
Since the end of the 1950s, over 125 space probes have been launched to study the planets and satellites of the solar system.
Mars Odyssey was put into orbit around Mars in 2001 to study its geology and environment and to detect the presence of underground water.
Pathfinder landed on Mars in the summer of 1997. There, it deployed a small all-terrain vehicle named Sojourner to study the composition of the surface.
Mariner 10 photographed the surface of the planet Mercury three times in the mid-1970s, revealing a world quite similar to that of our Moon.