Astronaut Space Coloring Page: Free Printable PDF Sheet

Astronauts and Human Spaceflight: Key Facts and Milestones

The First Human in Space

Soviet cosmonaut Yuri Gagarin became the first human to travel into space on April 12, 1961, completing a single orbit of Earth aboard Vostok 1 in a flight lasting 108 minutes. Gagarin's capsule did not land conventionally — he ejected at approximately 7 kilometers altitude and parachuted to the ground separately, a detail kept secret for decades because the rules for the world air sports record at the time required the pilot to land with the aircraft. His flight triggered the broader space race between the Soviet Union and the United States that defined space exploration for the following decade.

The First Spacewalk

Soviet cosmonaut Alexei Leonov performed the first spacewalk on March 18, 1965, during the Voskhod 2 mission. He floated outside the spacecraft for 12 minutes, tethered by a safety line, and nearly could not return to the capsule — his suit had inflated in the vacuum of space and he had to reduce pressure inside the suit to squeeze back through the airlock. The experience directly influenced the design of later Soviet and American spacesuits, adding reinforced joints and pressure-limiting valves to give astronauts more mobility during EVA work.

The Apollo Moonwalks

Between 1969 and 1972, twelve NASA astronauts walked on the surface of the Moon during six Apollo missions. Neil Armstrong and Buzz Aldrin landed first on July 20, 1969, during Apollo 11. The last Moon landing was Apollo 17 in December 1972, when geologist Harrison Schmitt became the only professional scientist to walk on the lunar surface. The combined time the twelve astronauts spent on the lunar surface totals approximately 80 hours, during which they collected 842 pounds of rock and soil samples that researchers are still analyzing over fifty years later.

The International Space Station

The International Space Station has been continuously inhabited since November 2, 2000 — the longest uninterrupted human presence in space in history. The station orbits Earth at an average altitude of approximately 254 miles and completes one full orbit every 90 minutes, meaning the crew experiences 16 sunrises and 16 sunsets every 24 hours. More than 270 individuals from 21 countries had visited the station by 2024. Typical crew missions last six months, though some long-duration studies have extended to 371 days for a single astronaut to study the effects of extended microgravity on the human body.

Training to Become an Astronaut

NASA's current astronaut training pipeline begins with a two-year basic training program that covers spacecraft systems, spacewalk techniques, Russian language (required for ISS operations), T-38 jet aircraft proficiency, and survival training in water and wilderness environments. Candidates practice spacewalks in the Neutral Buoyancy Laboratory — a 6.2-million-gallon pool near Houston where a full-scale ISS replica is submerged. The pool creates neutral buoyancy that approximates the feeling of floating in microgravity more closely than any other Earth-based simulation. After basic training, astronauts typically wait an average of three years before receiving their first mission assignment.

Earth as Seen from Orbit

Astronauts frequently describe the view of Earth from space as transformative — a reaction sometimes called the overview effect. At the altitude shown in this coloring page, the curvature of Earth is clearly visible against the black of space, and the thin blue line of the atmosphere is strikingly apparent. The oceans dominate the view, covering about 71 percent of the planet's surface area. Cloud systems show the movement of weather patterns in real time. Most city lights are not visible in daylight, but at night city grids along coastlines and river valleys glow clearly against the dark landmasses — a view that has been photographed extensively from the ISS since 2000.