Developments this year have turbocharged the race to be the first to launch paying customers into space, says the Chinese University of Hong Kong's Lisa Wan.
By all indications, space will become affordable within the next 15 to 20 years.
Many people alive today will have a real chance of travelling to space in their lifetimes - whether a sub-orbital flight to the edge of space or lifting off to the Moon, to Mars or somewhere in between............
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