Any instrument-carrying device sent from Earth to study another celestial body, or to take measurements of the conditions in space.
a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation
an unmanned craft sent to explore space
An unmanned spacecraft which collects information about objects in space and sends it back to scientists on Earth.
Spacecraft sent away from earth into space. See. p. 153.
A space probe is an unmanned research spacecraft.
space exploration satellite.
Machine sent out into space.
A space probe is an unmanned space mission in which a spacecraft leaves Earth's orbit. The first successful space probe was the Soviet Luna 1, which studied the Moon in 1959. Subsequently, space agencies in the United States, Europe and Japan have flown probes to each of the eight other planets in the solar system and several asteroids and comets.
