SpaceShipTwo carries passengers to the edge of space for a few minutes of weightlessness before gliding back to a runway landing.
A far shorter and cheaper experience than an orbital mission, but still entirely out of reach for the vast majority of people on Earth.
At $450,000 a seat, it's positioned as the "accessible" option on this list.
Hundreds of people have still paid it — proving that even the discount version of leaving the planet is a luxury reserved for a tiny fraction of humanity.
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