When White House speechwriter Peggy Noonan arrived for work on 28 January 1986, preparations for the annual US State of the Union address were largely complete, with President Ronald Reagan due on national television from the Oval Office that evening. Noonan was at her desk, helping to add the finishing touches before lunch, when everything changed. A live CNN broadcast captured the moment that the Space Shuttle Challenger broke up, just after lift-off, with the loss of all crew, including a civilian school teacher who was due to beam back lessons from space. So devastating was the catastrophe that for the first time in anyone's memory, the State of the Union speech was postponed, and Noonan was tasked with writing a new one addressing the national loss. It was to become one of Reagan's best. Passionate, reflective and optimistic, the president hailed the bravery of space endeavour and quoted poetry, describing the astronauts as "slipping the surly bonds of earth" to "touch the face of God"'.

Tragedies such as Challenger are reminders if any were needed of the dangers of exploring and working in space, where engineering, science and people are pushed to the limit. And there have been other disasters since Space Shuttle Columbia, for example, exploded on re-entry in 2003, killing all seven crew onboard. It has left a sense of unfinished business hanging over the space race a need to keep going and to make up for what was so close but has not yet come to fruition. In his post-Challenger speech, Reagan admitted as much acknowledging the risks of space but arguing that the future belonged "to the brave". "The Challenger crew was pulling us into the future, and we'll continue to follow them." And Reagan was right. Over a 40-year lifespan, the $200bn-plus space shuttle programme demonstrated the huge advances that can be made when ambition and blue-sky thinking are transformed into reality, often against the odds. The fleet of five re-usable shuttles flew 135 missions, many of which laid the foundations of the International Space Station, launched ground-breaking technology such as the Hubble Space Telescope, and undertook numerous Spacelab experiments. The imagination and drive of individuals to push through failure undaunted while confidently aiming high have made the space industry what it is today and will continue to shape its future. The billionaires with the right stuff This is useful for investors to remember as we stand before one of the most exciting times for space exploration and the space industry as a whole, with industry veterans talking of a renaissance. Space enterprise epitomises the notion of entrepreneurialism, with visionary adventurers steadfastly finding and refining solutions in the face of adversity, always pushing through setbacks and barriers. So it is fitting that the new chapter in space exploration now under way has seen start-up private businesses move in to become distinct players in what until now (with small-scale exceptions) had exclusively been the sphere of the government and the defence industry (the US Department of Defense has a significant but mostly classified involvement in space). Far from dimmed, the pursuit of space seems brighter than ever. And it's more than just talk: big risks are being taken and big money spent. As space agency Nasa's acting administrator Robert Lightfoot said last year, "There is more going on right now in space than I've ever seen in my career".

The US government is planning to revisit the moon and put astronauts on Mars. Space tourism at scale the enduring dream is now probably closer than ever before. And there's ongoing demand for the development and launch of newer and more sophisticated satellites. At the same time, asteroid mining, manned missions to asteroids, space-based solar power, private space stations and planetary colonisation are all being pursued at various different levels. Indeed, work is even being done on highly conceptual ideas plucked from the pages of science-fiction novels, such as warp drive, cryogenic hibernation and space hotels. The list of big investors in space reads like a who's who of modern billionaires: Tesla founder Elon Musk owns rocket company SpaceX, in which Google founders Larry Page and Sergey Brin have both invested; Amazon tycoon Jeff Bezos has his own rocket company, Blue Origin; Microsoft founder Bill Gates has backed satellite antenna technology specialist Kymeta; Facebook founder Mark Zuckerberg has invested in SETI, a project to survey the universe for signs of intelligent life; and Virgin's Richard Branson has, of course, been promising space flights via Virgin Galactic for many years now. These entrepreneurs have high profiles and pockets deep enough to get a venture off the ground and they are also all visionaries who've already successfully turned blue-sky thinking in other areas into market-beating returns for their investors. The public backs more exploration Of course, the involvement of private business in the space economy shouldn't be exaggerated. Governments are still the dominant players, and will be for the foreseeable future. But with that caveat in mind, it's encouraging that since 2000 more than 180 space start-ups in all have been funded. Most of those came in the last three years or so, with around $2bn-$3bn being raised by the sector each year. Overall investment since 2000 including associated debt now stands at $18.5bn from more than 500 investors, including the likes of Google, Fidelity and SoftBank. The aforementioned SpaceX and Blue Origin both of which are developing technologies for vertical take-off and landing vehicles are among a handful of space-related companies to have attracted more than $1bn-worth of investment each.

Meanwhile, public support for further space exploration is high. According to Pew Research, a US think tank, 68% of Americans hold a favourable view of Nasa, while 59% believe human astronauts are essential to the US space programme's future. A Europa survey suggests similarly positive views on space programmes across the European Union in particular of the effects these can have over coming decades in improving "down-to-earth" issues, such as energy sustainability and environmental protection. The growing stellar economy In all, consultancy group Bryce Space and Technology believes the space economy as a whole was worth $345bn in 2016. That value is underpinned by trends including the growing availability of private capital from new investors in the space sector; a world increasingly reliant on the transmission, receipt and processing of data; and a renewed government commitment to space on both strategic and military grounds. These underlying currents are attractive in their own right. But if we also accept the view that we're just at the start of a new, multi-generational chapter in the economic development of space, then we can begin to see a compelling investment case. That's what the OECD, a club of developed nations, foresees. A 15-year space development cycle started this year, it thinks, which will lead to growing satellite use in mass-market products and in global monitoring; a new generation of space stations; new telescopes and unmanned, robotic missions supporting comprehensive mapping of the solar system; and a generalised increase in activity in space as new types of launchers, of various shapes and sizes, come of age.

All of this is getting industry commentators and analysts excited, with long-term targets for the space economy that are (forgive the pun) stratospheric. United Launch Alliance, a joint venture from aerospace and defence giants Lockheed Martin and Boeing to provide launch services for the US government, envisions the space economy being worth $2.7trn by 2045, by which point the venture also expects to be employing around 1,000 people actually based in space. Analysts at investment bank Morgan Stanley are a little less bullish but by 2040 they still expect the space economy to be worth at least $600bn and as much as $1.75trn. Taking a forecast in the middle of these two implies annual 5% growth from here, ahead of anticipated growth in global GDP. Within any sector, of course, forecasting out over 20 years and beyond is more projection than estimation, and not even the most comprehensive analysis of the space economy can account for technological breakthroughs, future government defence needs, and changes in financial resources and project priorities. But there can be no mistaking the large capital commitments, determination and imagination that could, over the long term, take the sector further. One problem with these big numbers and long-range projections, coupled with the diversity of projects from asteroid mining to space hotels is not knowing where to start. Space is overwhelming. Anything and everything seems possible. And maybe it is. But the steps we take to get there will be incremental ones. As a first step to help you get used to the industry, it is worth focusing on activities that already have active marketplaces, revenues, and even profits. At the moment these are in roughly four main areas: the satellite industry, the launch industry, insurance, and the military. A vast expanse of investment opportunities Let's start with satellites. This global industry generated revenues of $269bn in 2017, according to Bryce Space and Technology, which is about 75% of the current space industry's revenues as a whole. Almost half of this was from services, the vast bulk of which is related to television. Almost as big is the associated ground equipment sub-sector, which is heavily consumer-orientated think geo-spatial positioning devices such as satnav (and the related chipsets), and satellite television dishes.

Satellite technology is changing considerably: according to the OECD, while a traditional satellite might cost $1bn to build and put into orbit, small "CubeSats" that weigh less than 10kg can cost as little as $5m and be built in days or weeks, opening up space to more users for an ever-wider range of applications. Thousands of these CubeSats are expected to launch over the next five years, many of which will function as a small part of larger "constellations". Although they are still less durable and functional than their larger cousins, researchers are working on the problem. Of course, these satellites all need to be put into orbit, which places launch-service providers at the heart of the space industry. In the past satellites were generally launched via government programmes. Now private companies such as SpaceX, with its Falcon launcher, and Blue Origin, are building market share with re-usable technology that allows for more frequent launches at a lower cost, against a background of rapidly rising satellite deployment. Needless to say, things can go wrong an average of one in 20 satellite launches will fail according to XL, the global insurance group, although failure rates have been falling in recent years. A good number of launches aren't insured, but because the satellites are increasingly complex the average insurance claim has almost tripled in value over the past 20 years or so to around $120m. As for insurance for space tourism, this is a whole new area where appropriate products need to be developed. Alongside these activities the defence industry will continue to play a role in space, one regarded as fundamental to national security in a world of constant geopolitical tension, new technological developments, and increasing access to military hardware.