SOLAR SYSTEM

Detailed explanation-1: -A probe is a spacecraft that travels through space to collect science information. Probes do not have astronauts. Probes send data back to Earth for scientists to study. Sputnik 1 was the first probe to go into space.

Detailed explanation-2: -A space probe is an unpiloted, unmanned device sent to explore space and gather scientific information. A space probe is launched from Earth with a set of scientific instruments and tools used to study the atmosphere and composition of space and other planets, moons, or celestial bodies.

Detailed explanation-3: -There are a few other space probes that have reached, or are about to reach, the ‘boundary’ of our solar system, which is extremely far away, as you can imagine. Now, space probes, by definition, are robotic spacecraft, meaning that they don’t have humans onboard.

Detailed explanation-4: -No spacecraft has gone farther than NASA’s Voyager 1. Launched in 1977 to fly by Jupiter and Saturn, Voyager 1 crossed into interstellar space in August 2012 and continues to collect data. Voyager 1 and its sister ship Voyager 2 have been flying longer than any other spacecraft in history.

Detailed explanation-5: -Three of these satellites (Sputnik 1, 2, and 3) reached Earth orbit.

Detailed explanation-6: -A total of nine spacecraft have been launched on missions that involve visits to the outer planets; all nine missions involve encounters with Jupiter, with four spacecraft also visiting Saturn. One spacecraft, Voyager 2, also visited Uranus and Neptune.

Detailed explanation-7: -Explorers Program (1958–present) Pioneer program (1958–1978) Project Echo (1960–1964) Ranger program (1961–1965) Telstar (1962–1963) Mariner program (1962–1973) Lunar Orbiter program (1966–1967) Surveyor program (1966–1968) More items