Spacecraft

A spacecraft is a vehicle that is designed to fly and operate in outer space. These amazing machines help us do many important things, like talking to each other over long distances, watching Earth from above, studying weather, and exploring other planets. Most spacecraft need a special rocket, called a launch vehicle, to get them into space.

Some spacecraft travel only a short way above Earth and come right back down. Others go into orbit, which means they circle around Earth or another planet. When people travel in space, they ride in spacecraft that can carry humans. But many spacecraft are robotic, meaning they work on their own or are controlled from far away. These robotic spacecraft help scientists learn about space and other worlds.

Only a few countries have the ability to launch spacecraft into orbit around Earth. These include Russia, the United States, Japan, China, India, and a few others. Also, some private companies, like SpaceX and Blue Origin, are working on their own space launch technologies. Spacecraft have helped us learn a lot about our universe and continue to open new doors to future discoveries.

History

See also: History of spaceflight

The first spacecraft was a German V-2 rocket designed by Wernher von Braun, reaching an altitude of 189 km in June 1944. However, it was Sputnik 1, launched by the Soviet Union on October 4, 1957, that became the first artificial satellite to orbit Earth. This launch marked the beginning of the Space Age and brought about many new technological and scientific discoveries. Sputnik 1 traveled at about 29,000 kilometers per hour and helped scientists learn more about Earth's atmosphere and radio signals in space.

Crewed and uncrewed spacecraft

See also: List of crewed spacecraft and human spaceflight

Only three countries have sent people into space: Russia, the United States, and China. The first person to travel into space was Yuri Gagarin from the Soviet Union in 1961 aboard Vostok 1. Soon after, Alan Shepard from the United States made a short trip into space on Freedom 7. Many different spacecraft have been used to carry people into space since then.

Uncrewed spacecraft are robots that travel into space without people. They can be controlled from Earth or can follow instructions programmed before they leave. Robots are often used when it is too dangerous or far away for people to go. For example, we use robots to visit planets like Venus or faraway places like Saturn. Space telescopes, like the famous Hubble Space Telescope, are special uncrewed spacecraft that help us see stars and galaxies clearly from above Earth’s atmosphere.

Main articles: Uncrewed spacecraft, satellite, space telescope, and cargo spacecraft

See also: Timeline of artificial satellites and space probes, list of Solar System probes, and list of space telescopes

Types of spacecraft

Communications satellite

Main article: Communications satellite

A communications satellite is an artificial satellite that helps send and receive radio signals from one place to another on Earth. These satellites make it possible to watch TV, make phone calls, use the internet, and more, even in faraway places. Many of these satellites float in a special path called geostationary orbit, staying in the same spot above the equator so we can always find them in the sky.

Cargo spacecraft

Further information: Comparison of space station cargo vehicles

Cargo spacecraft are robots that carry supplies like food and fuel to space stations. They have been helping astronauts since 1978, visiting places like the International Space Station. Today, three main cargo ships are used: the Russian Progress, the American SpaceX Dragon 2, and Cygnus. China also uses Tianzhou for its space station.

Space probes

Main article: Space probe

Space probes are robots sent to explore space and other planets. Unlike landers, they stay in space and don’t touch the surface. They have visited every planet in our solar system and even Pluto. Some, like Voyager 1 and Voyager 2, are still traveling far beyond our solar system.

Space telescopes

Main article: Space telescope

A space telescope is a special kind of telescope that orbits Earth to look at stars and other space objects. Because it’s above our atmosphere, it can see much clearer and without the bright lights of cities below. These telescopes help scientists learn about the universe.

Landers

Main article: Lander (spacecraft)

A lander is a spacecraft that can touch down softly on another world, like the Moon or Mars. Some use their own fuel to land, while others use the air of a planet to slow down, which needs a special shield to protect it from heat.

Space capsules

Main article: Space capsule

Space capsules are spacecraft that can come back to Earth. They’re simple and don’t have wings, making them easy to reuse. The first one was the Vostok capsule, which carried Yuri Gagarin, the first human in space.

Spaceplanes

Main article: Spaceplane

Spaceplanes look and act like airplanes but can fly into space. The first was the North American X-15 in the 1960s. Later, the Space Shuttle orbiter could fly into space and land like a plane. Today, new spaceplanes are being built for trips into space and back.

Other

SpaceX Starship

Main article: SpaceX Starship (spacecraft)

Starship is a new spacecraft being built by SpaceX. It’s designed to carry people and cargo to places like the Moon and Mars. It can also help with trips around Earth in just minutes.

Mission Extension Vehicle

Main article: Mission Extension Vehicle

The Mission Extension Vehicle is a robot that helps keep other satellites working longer. It docks with a satellite and moves it to the right path or orbit. This helps satellites stay useful even when they might run out of fuel.

Subsystems

Main article: Astrionics

A spacecraft has different parts that help it complete its mission. These parts are attached to the main body, called the satellite bus. Some important parts include systems for controlling the spacecraft’s direction, communicating with Earth, managing power, and keeping the right temperature.

For spacecraft carrying people, there is also a life-support system to keep the crew safe. Depending on the mission, a spacecraft might also have a propulsion system to move or adjust its path in space. The payload, which is the part that fulfills the spacecraft’s main purpose, can include scientific instruments, cargo, or crew members.

Supporting logistics

Main article: Ground segment

The ground segment helps spacecraft work. It includes a place where teams control the spacecraft, equipment to store and process data, ground stations that send and receive signals, and networks that keep everything connected.

The launch vehicle carries the spacecraft from Earth into space. It can be expendable or reusable. Some rockets, called single stage to orbit rockets, can act as spacecraft themselves.

Spacecraft records

Some spacecraft have traveled faster or farther than any others. The Parker Solar Probe is the fastest, reaching speeds of up to 343,000 kilometers per hour when it passes close to the Sun. Two older probes, Helios I and II, were also very fast, moving at about 252,792 kilometers per hour.

The farthest spacecraft from the Sun are the Voyager 1, Pioneer 10, Voyager 2, and Pioneer 11 probes. As of 2022, Voyager 1 is the most distant, traveling outward at about 61,100 kilometers per hour.