Man on the Moon: The 20 Most Important Space Missions in History

Sputnik 1 was the world’s first artificial satellite. Launched by the Soviet Union in 1957, its regular beeps marked the beginning of the space age and sparked a race that transformed politics, science, and even pop culture. If you’ve ever tracked a satellite’s path on your phone, you’re following a trail that began with that little sphere.

Luna 3 flew past the Moon in 1959 and took the first photographs of the far side, which had been a cosmic mystery until then. The images were blurry by today’s standards, but they completely changed our understanding of the Moon’s surface and proved that the Moon had a completely different appearance and topography.

With Yuri Gagarin on board, the Soviet Union and Vostok 1 sent the first man into orbit in 1961, a tremendous achievement at the time. His single-orbit flight was short, lasting only 108 minutes (1 hour and 48 minutes), but it proved that people could survive launch, weightlessness, and reentry without serious consequences. From that day on, the question was no longer “Can we go there?” but “How far can we go?”

In 1962, Friendship 7, piloted by John Glenn, orbited the Earth three times, giving the United States its first astronaut in orbit. The mission combined automated systems with manual control, and it served as a reminder to everyone that space equipment has a way of throwing curveballs. It helped transform astronauts into active pilots and pushed mission planners toward longer and more ambitious flights.

It was aboard Voskhod 2 that Alexei Leonov opened the hatch and made the first spacewalk, an experience he described as “that of a seagull with outstretched wings, soaring high above the Earth.” As incredible as that was, his family was not thrilled; his spacesuit inflated in the vacuum, turning his return to the airlock into a nightmarish struggle that he fortunately overcame thanks to his quick thinking and a bit of luck. Spacewalks, however, subsequently became an indispensable skill.

Gemini 8 performed the first space docking, under the command of Neil Armstrong and David Scott. However, shortly after docking, both spacecraft lost control of their rotation, and the crew had to stop the rotation and end the mission prematurely; otherwise, they would have lost consciousness.

In December 1968, Apollo 8 carried humans to the Moon, orbited it ten times, and then returned to Earth. The crew did not land on the Moon, but they were able to take the iconic “Earthrise” photograph, which gave everyone a new perspective on our fragile blue home.

The great leap forward came with Apollo 11 in July 1969, when the astronauts finally achieved their goal of landing on the Moon and returning safely to Earth. This national goal had been set by none other than President John F. Kennedy, just eight years before the mission’s success.

Apollo 13 was supposed to be the third attempt to land on the Moon, but the crew ran into trouble when one of the oxygen tanks exploded, forcing them to abandon their mission and return to Earth. If you’re familiar with the quote “Houston, we have a problem,” it’s a famous line from Apollo 13.

Salyut 1, launched by the Soviet Union in 1971, was the first space station and the first genuine attempt to live in orbit rather than simply visit it. It forced engineers to consider how to sustain vital functions over the long term, establish daily routines, and understand what happens to humans in the absence of gravity.

In 1975, the Apollo-Soyuz mission docked an American spacecraft with a Soviet one. The mission demonstrated how common docking systems and compatible procedures can make collaboration possible, even when the two countries involved disagreed on almost everything else.

When Viking 1 landed on Mars in 1976, it delivered the first long-term scientific laboratory to another planet. Its experiments to detect life yielded intriguing and puzzling results—which is exactly what real science usually does. The flood of images also made Mars look less like a red dot in the sky and more like a world with a climate and landscapes.

Two space probes named Voyager were launched in 1977 to explore the outer solar system. They revealed the existence of volcanoes on Io (a moon of Jupiter), strange rings, icy moons, and much more. Voyager 1 is now in interstellar space, and the fact that it continues to communicate with us is the closest thing to real-life science fiction.

In 1981, STS-1 launched the Columbia on the Space Shuttle’s first mission, proving that it was possible to bring a spacecraft back to Earth and fly it again. The shuttle era made large-scale practical tasks more commonplace, including satellite deployment, repairs, and spacewalks. Its legacy is complex, but it has undeniably shaped the way humans and equipment have learned to work together in orbit.

Launched in 1990, the Hubble Space Telescope escaped the blurring effects of Earth’s atmosphere and began observing the universe with great precision. After a famous repair to correct its initial mirror problem, it provided observations that refined estimates of the age of the universe and helped map the evolution of galaxies. Hubble transformed deep space into something we could actually imagine, rather than just calculate.

Imagine a floating laboratory the size of a soccer field, and you have the International Space Station. Since the first modules were installed in 1998 and permanent crews began living there in 2000, it has taught us how bodies, materials, and machines behave during years of microgravity. It’s also where astronauts and engineers train for more challenging missions, because we don’t want to go to Mars without having trained for the long journey.

No one told Spirit and Opportunity—two identical twin rovers—that they were supposed to stop after 90 days, so they continued to roam Mars for years. They found minerals that form in water, tracked climate change, and helped us better understand life and history on Mars.

Cassini-Huygens, more commonly known as Cassini, was an unmanned space probe launched by NASA to map Saturn. The probe flew through Titan’s haze and transmitted data on a landscape featuring rivers and coastlines, while also discovering the material that makes up the planet’s iconic rings.

After a nine-year journey, New Horizons flew past Pluto in 2015 and replaced vague estimates with actual geographical data. It spotted icy mountains, nitrogen glaciers, and a changing atmosphere, which makes Pluto seem alive in its own icy way, even though it is not technically classified as a planet.

The James Webb Space Telescope observes the universe in infrared, allowing it to peer through cosmic dust and capture light that has been traveling since the earliest eras. Since its launch on Christmas Day 2021, it has provided sharp images of newly formed stars, distant galaxies, and even the chemical signatures of certain exoplanet atmospheres.