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Question remains whether profit can be made from tourism
VSS Unity replaces failed SpaceShipTwo vehicle that broke up in testing
Probe finds regulator saw scope for human error but still issued waiver to rules
Size and cost revolution encourages start-ups to launch niche enterprises into orbit
Future of suborbital flight programme likely to hinge on report into fatal crash in 2014
Too early to blame pilot error, say accident investigators
Tragedy raises questions over fledgling industry, with first planned flight set to be pushed back
Safety warnings denied as funding becomes acute
Success in space travel needs investment most entrepreneurs are likely unwilling to make
International Edition