On July 20, 1969, American astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon. (The third member of the Apollo 11 crew, Michael Collins, piloted the orbiting spacecraft.) Armstrong stepped off the lunar landing module Eagle and,uttered the famous phrase “That’s one small step for man, one giant leap for mankind.”
From more than 386,242 kilometers (240,000 miles) away, millions of people tuned into the radio and watched a live television broadcast. Armstrong and Aldrin spent 21 hours and 36 minutes exploring the Moon before safely returning to the command vehicle and Earth.
NASA sent several additional Apollo missions to the Moon. Each mission studied different features of the Moon such as the Fra Mauro crater and the Taurus-Littrow highlands. These missions were interested in the physical and geographical aspects of the Moon, including soil properties, magnetic fields, and solar wind characteristics.
Term Part of Speech Definition Encyclopedic Entry aspect Noun
view or interpretation.
person who takes part in space flights.
bowl-shaped depression formed by a volcanic eruption or impact of a meteorite.
Encyclopedic Entry: crater highlands Plural Noun
plateau or elevated region of land.
having to do with Earth's moon or the moons of other planets.
magnetic field Noun
area around and affected by a magnet or charged particle.
Earth's only natural satellite.
to move in a circular pattern around a more massive object.
Encyclopedic Entry: orbit pilot Noun
person who steers a ship or aircraft.
top layer of the Earth's surface where plants can grow.
solar wind Noun
flow of charged particles, mainly protons and electrons, from the sun to the edge of the solar system.
vehicle designed for travel outside Earth's atmosphere.