What is space probe and what are their different parts?

A space probe is a scientific space exploration mission in which a robotic spacecraft leaves the gravity well of Earth and approaches the Moon or enters interplanetary or interstellar space (see list of probes by operational status for a list of active probes); The space agencies of the USSR (now Russia and Ukraine), the United States, the European Union, Japan, India and China have in the aggregate launched probes to several planets and moons of the solar system as well as to a number of asteroids and comets.Once a probe has left the vicinity of Earth, its trajectory will likely take it along an orbit around the Sun similar to the Earth's orbit. To reach another planet, the simplest method is to execute a Hohmann transfer orbit maneuver. More complex techniques, such as gravitational slingshots, can be more efficient, though they may require the probe to spend more time in transit. A technique using very little propulsion, but possibly requiring a considerable amount of time, is to follow a trajectory on the Interplanetary Transport Network