The year of the first recorded use of a true rocket, used by the Chinese to barrage waves of Mongol invaders.

Date of the first Earth-orbiting artificial satellite, called Sputnik, launched by the Soviet Union.

Launched by the U.S. Army on January 31, 1958, this rocket was America's first orbital satellite.

This Apollo mission was the first to land on the moon.

This Apollo mission had an in-flight explosion that caused the crew to abort their moon landing, and placed their lives in extreme danger.

One of the leading figures in the development of pre-war Germany's rocket program and the development of the V2 missile, this man became a leading proponent of America's space program.

How many moon landing missions were there?

This Apollo mission was America's last manned moon landing on December 11, 1972.

Launched on August 20, 1977, this probe was one of two spacecraft designed to explore our solar system and beyond.

A bubble around the sun created by the outward flow of the solar wind from the sun and the opposing inward flow of the interstellar wind. Voyager 1, which is traveling up away from the plane of the planets, left this bubble (entered interstellar space) on Aug. 25, 2012.

The boundary marking one of the outer limits of the Sun's influence, and is one boundary of the Solar System.

The rocket that launched the Voyager missions in 1977.

Location of NASA Mission Control Center

Month, Day, and Year of the first moon landing

Commander of Apollo 13

Launched on May 30, 1971, this was the first Mars mission, placing a satellite in Mars' orbit.

This mission found a place in history when it became the first to land a spacecraft safely on the surface of another planet.

America's ground-based nuclear deterrent missile. 450 of them are spread out in underground silos below Montana, North Dakota, and Wyoming. They are solid-fuel missiles ready to launch at a minute's notice.

Launched from an Ohio-class nuclear submarine, these missiles provide the backbone of America's nuclear deterrent.

First launched on 6 Feb, 2018, it is the most powerful operational rocket in the world by a factor of two. With the ability to lift into orbit over 54 metric tons (119,000 lb).

A reaction force described quantitatively by Isaac Newton's second and third laws. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system. In rocketry, this force is generated by the propulsion system of the rocket.

A classified, unmanned, reusable US Air Force spacecraft that can be maneuvered to varying paths and orbits in order to conduct undisclosed activities.

Consisting of a lander and the Sojourner rover, returned an unprecedented amount of data as they explored an ancient flood plain in Mars' northern hemisphere known as Ares Vallis.

The first human in space, leaving Earth on April 12, 1961, aboard a Vostok-K rocket for a multi-orbit flight.