A Short History of Space Exploration

Reaching for the Stars

For almost all of human history, space was a place we could only look at, never visit. People watched the Sun, Moon and stars cross the sky and wondered what they really were. Yet in just over a single lifetime, humans went from never leaving the ground to walking on the Moon and sending robots across the solar system.

This book tells the short but amazing story of space exploration — how we escaped Earth's gravity and began to explore the cosmos.

Chapter 1: The Problem of Gravity

To leave Earth, you must beat gravity, the force that pulls everything toward the ground. To do that, a spacecraft has to travel incredibly fast — around 28,000 kilometres per hour just to stay in orbit.

The machine that makes this possible is the rocket. A rocket burns fuel to push hot gas out of its back end at huge speed. By Newton's law that every action has an equal and opposite reaction, the rocket is pushed forward. Early rocket pioneers like Konstantin Tsiolkovsky and Robert Goddard worked out the science in the early 1900s, long before anyone could build a rocket big enough to reach space.

Chapter 2: The Space Race Begins

After World War II, two powerful countries — the United States and the Soviet Union — competed to be first in space. This rivalry became known as the Space Race.

The Soviet Union struck first. In 1957 they launched Sputnik 1, the first artificial satellite, a metal ball the size of a beach ball that beeped as it circled Earth. People around the world were astonished — the Space Age had begun.

Then, in 1961, Soviet cosmonaut Yuri Gagarin became the first human in space, orbiting Earth once before landing safely. The race was on.

Chapter 3: Walking on the Moon

The United States set itself an enormous goal: to land a person on the Moon and bring them home safely. The effort was called the Apollo programme, and it employed hundreds of thousands of people.

On 20 July 1969, the dream came true. Apollo 11 carried three astronauts to the Moon. Neil Armstrong climbed down the ladder and became the first human to step onto another world, saying the famous words: "That's one small step for man, one giant leap for mankind." Buzz Aldrin joined him while Michael Collins orbited above.

In total, twelve people walked on the Moon between 1969 and 1972. They collected rocks, took photographs and set up experiments that still teach us about how the Moon formed.

Chapter 4: Robots Lead the Way

Sending humans into space is dangerous and expensive. For exploring distant places, we mostly send robots instead.

Space probes have now visited every planet in our solar system. The Voyager spacecraft, launched in 1977, flew past Jupiter, Saturn, Uranus and Neptune and have since left the solar system altogether — the most distant human-made objects in existence.

On Mars, robotic rovers like Curiosity and Perseverance drive across the surface, drilling rocks and searching for signs that life may once have existed. To learn more about the planets they visit, see Understanding Our Universe.

Chapter 5: Living in Space

Humans have also learned to live in space for long periods. Since 2000, astronauts have continuously lived aboard the International Space Station (ISS), a laboratory orbiting about 400 kilometres above Earth.

On the ISS, astronauts float in microgravity, where everything is weightless. They run science experiments, study how the human body copes without gravity, and work together as crews from many countries. Living in space is hard: muscles weaken, and even simple things like eating and sleeping have to be done in new ways.

Chapter 6: The Future of Exploration

Space exploration is entering an exciting new era. Powerful telescopes like the James Webb Space Telescope peer back toward the beginning of the universe. Private companies now build reusable rockets that land back on Earth, making spaceflight cheaper.

Space agencies are planning to return astronauts to the Moon and, one day, to send humans to Mars. Scientists keep searching for life beyond Earth, scanning other planets and moons for water and the ingredients of life.

Why It Matters

Space exploration is about more than rockets and records. It pushes us to invent new technology — many everyday gadgets began as space inventions. It helps us understand our own planet by seeing it from afar. And it answers some of the biggest questions humans have ever asked: Where did we come from? Are we alone?

The story of space exploration is still being written — and the explorers of tomorrow are kids reading books like this one today.