What does SS1 stand for?

Space Ship One (Scaled Composites)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.
Business, finance, etc.

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Samples in periodicals archive:

After Scaled Composites put the rocket plane Space Ship One (SS1) into suborbital spaceflight twice in 2004, thus winning the Ansari X-Prize, Virgin Galactic placed an order for 12 similar spacecraft capable of carrying six passengers and two crew members into space.

United States: Virgin Galactic Unveils White Knight Two Launch Vehicle

Rutan designed and successfully tested Space Ship One, which forms the basis for the spacecraft that will be used by Richard Branson's Virgin Galactic.

$10m prize to develop jet fuel alternative

In addition to the pounds 60m, Virgin Atlantic has spent pounds 14m buying the licensing rights to Burt Rutan's Space Ship One, which successfully went into space twice earlier this month.

Stars queue for space trip

The Space Ship One rocket plane, funded by Microsoft co-founder Paul Allen, took off from a desert runway slung to the belly of a carrier plane with test pilot Brian Binnie at the wheel.

Rocket hits jackpot

The spacecraft are modelled on Space Ship One, designed by aviation legend Burt Rutan whose company, Scaled Composites, operated the world's first privately manned space flight last June.

Branson plans to bring space travel within reach of general public -- ...

The first private manned space flight took place in June, when Space Ship One, a craft funded by billionaire Microsoft co-founder Paul Allen and designed by aviation pioneer Burt Rutan, reached the required altitude on a test flight.

Private space flight bid crashes in flames