SOLAR SYSTEM

Detailed explanation-1: -Astronauts accomplished many things on the Gemini missions. The first flight to carry astronauts was Gemini 3 (also known as Gemini-Titan 3 or GT-3). That flight tested the new vehicle. The Gemini 4 mission included the first U.S. spacewalk.

Detailed explanation-2: -The Gemini program sent two-astronaut spacecraft into Earth orbit. The missions helped NASA understand and master the challenges of spacewalking, rendezvous and docking, and long-duration spaceflight.

Detailed explanation-3: -Gemini 3 (Grissom and Young) was the first crewed Gemini mission, first multi-crewed US mission, and the first US spacecraft to use thrusters to change its orbit. On Gemini 4, Ed White became the first American to make an extravehicular activity (EVA, or “spacewalk") on June 3, 1965.

Detailed explanation-4: -The goals of Gemini VIII, the first mission of 1966, included docking with a target vehicle and conducting a lengthy spacewalk during a three-day flight.

Detailed explanation-5: -Gemini, any of a series of 12 two-man spacecraft launched into orbit around Earth by the United States between 1964 and 1966. The Gemini (Latin: “Twins”) program was preceded by the Mercury series of one-man spacecraft and was followed by the Apollo series of three-man spacecraft.