Why explore space?

Some time ago I was asked, ‘Why explore space?’

It’s a good question; space exploration is very expensive, surely we could spend the money on better and more important things? Surprisingly, perhaps, spaceflight has become a very profitable industry. Although exploration per se remains almost entirely government funded, exploration in past decades has sparked the profitable space industries that exist today.

Taking the world as a whole, we spend a very large amount of money on space exploration, US$117 billion in 2023. It’s fair to say that the USA almost certainly spends more than any other nation, and China and India both have major space programs, so does Europe (taken as a whole) through the joint ESA programmes (ESA is not part of the EU, however). Russia and Japan are major players too. You can view the figures as a bar chart from Statista.

It’s not quite as simple as it sounds, though. For one thing, material and human resources are much more expensive in some countries than in others, so US$1 billion buys a lot less in the USA or Europe or Australia than it does in China, or India, or Brazil.

Another thing to consider is that space research, spaceflight, and space exploration are not all about spending a lot of money, they are also activities that can generate a great deal of income. Economics is complex and difficult.

I think it may help us if we briefly review the history of space exploration.

The history of spaceflight

We have to go back to ancient and medieval times to find the first hints that people wanted to travel beyond the Earth. Even thousands of years ago, some people thought about leaving Earth behind. The Bible describes Elijah being taken up in a fiery chariot. The Koran describes Mohammed on a winged horse. The Greek, Icarus, wanted to fly high above the Earth. Dante’s ‘Divine Comedy’ in 1320 describes a journey to the heavens. ‘Kepler’s Dream’ in 1608 describes how Earth would look from the Moon. In 1657 Cyrano de Bergerac described a journey from Earth to the Moon.

Of course, much of this was fanciful in various ways, but people were thinking about it. Science fiction became popular in the 19th and, especially, the 20th century and some of the ideas discussed seemed quite plausible. Engineering experiments with solid and liquid fuelled rockets began in the early 20th century, and that’s when some people began risking money (and sometimes their lives) to make progress with early rockets. Costs were involved, but no income was generated.

By 1944 the wartime German government could see the tide had turned against them, with losses on the Russian front and in North Africa. Italy had fallen to the Allies and by the middle of the year southern and northern France had been invaded and German forces were struggling to hold on. Germany had been developing new weapons for some time, and now they began to use them in a final attempt to reverse impending defeat. Jet aircraft, the first cruise missile (the V-1) and the first rocket capable of reaching space (the V-2, the first ballistic missile) all came into play at this late stage of the war. Firing the V-2 vertically in a test, Nazi Germany became the first nation to reach space at  174.6 kilometres (108.5 miles) on 20 June 1944. The rocket entered space vertically and fell straight back as it didn’t have sufficient fuel to attempt the horizontal velocity necessary to go into orbit.

After Germany’s defeat in May 1945 there was a scramble by the USA, the Soviet Union, and to a lesser degree by the UK to capture unflown V-2s, plans and information, construction and test facilities, as well as the engineers and technicians behind the technology.

Rocket technology was developed further, both for use as a weapon and also for scientific research and space exploration. This has led to many nations engaging in spaceflight and space exploration in the late 20^th and early 21^st centuries.

Recent developments

So now we have set the scene. Space exploration has become technically possible. It remains difficult and expensive, though the development of advanced and miniaturised electronics and computers for control, and improved fuels, materials, and designs have reduced the costs and look set to reduce them even more substantially in future. One major change in the last decade is that we now have the first reusable rocket boosters. SpaceX is already flying some of its Falcon 9 boosters more than twenty times. The costs savings are enormous and other rocket companies are trying to catch up.

Given all of this, why would we want to explore space?

Reasons for exploring space

First, it’s worth mentioning that the reasons for exploring space are the same as those for exploring more generally. People are born explorers: the youngest infant begins exploring the environment as soon as they can crawl. There are only two requirements – an ability to move from one place to another, and a desire to find out what lies further away.

Given the ability we now have to reach ever further into space, we just naturally want to investigate what is there and understand it to the best of our ability. These days, automatic systems can travel to dangerous and hard to reach places and return images and measurements without the presence of human travellers. So we have good images and many kinds of measurement from every large body in the Solar System, and growing numbers of the smaller asteroids and comets. But automated systems have limitations in terms of decision making and judgement, limitations that require the presence of people. These limitations are more severe than first appears given the great distances involved in exploring space. When a rover on the Moon takes an image, we may be able to view it within a few seconds and send instructions on what to do next. On Mars it might take twenty minutes to receive the image and another 20 minutes for the instruction to reach the rover. So a Mars rover needs to navigate and make decisions on avoiding obstacles semi-autonomously.

So far we have travelled only to Earth orbit and to the Moon, but the urge to go further remains. We’re a nosy and inquisitive race; we want to know more, we want to find out, we love to solve mysteries.

The benefits so far

This is unlikely to be an exhaustive list, there are many benefits already and new ones keep moving from theory to practice. I’ll list those I can think of below.

• Photographing the Earth’s surface from orbit. This benefits mapping, weather forecasting, resource discovery, agriculture, military intelligence and much, much more.
• Understanding geology by comparing Earth rocks and minerals with those on the Moon, other planets, rocky moons, and so on. We are learning how Earth and the other planets formed, and how long ago.
• Astronomy has advanced as telescopes are operated from space. Earth’s atmosphere causes reduced image clarity and blocks many wavelengths of light, X-rays, and other forms of radiant energy. Light pollution from cities is also avoided by putting a telescope into orbit. It also becomes far easier to identify smaller objects that might collide with Earth and potentially cause serious damage and loss of life.
• Probes have travelled to distant solar system objects to return images and sometimes samples of surface material.
• Manufacturing in micro-gravity can produce medical, engineering and scientific materials that simply cannot be made on Earth. Ultra pure proteins have aided medical science enormously in some areas, helping scientists understand protein structures for example, or manufacturing life-saving antibodies and drugs.
• Understanding the inhospitable conditions of space itself and the other planets in our solar system provides a perspective that helps us value what we have here on Earth.
• Communications systems have benefitted enormously from spaceflight. From TV satellites providing hundreds of high-resolution channels, to satellite internet availability for ships, aircraft and remote regions, the exploration of space has provided the technology behind these improvements. Good internet access for remote areas improves disaster rescue, allowing much quicker responses.
• Satellite navigation has transformed many aspects of land, air and sea travel. Who wants to manage without their satnav while driving?
• Spin-off technologies like solar panels, stronger materials such as carbon fibre, recycling and purification of air and water were all developed first because of space exploration and are now proving invaluable here on the ground as well.
• New resources are becoming available as a result of space exploration. Rare and expensive metals from asteroids, ices from comets and the moons of planets in the outer Solar System are likely to become useful in the near- to mid-term future. This is not yet commercially viable, but will become so as space transport systems develop further.

I hope that brief round up will help my readers understand some of the why-questions around space exploration. In the early days it was an expensive operation, funded by governments, and often justified by military considerations. Today, much space activity is done by companies with a profit motive. Launch services are now largely commercial in nature, so too is the transport of people and materials to and from Earth orbit and even now to and from the Moon. And finally, many satellites are launched every year for profit-making purposes as well – TV broadcasting, imaging, weather forecasting, and internet provision to name just a few.