Virgin Galactic's SpaceShipTwo could launch into space 'within weeks'

The VSS Unity is a spacecraft designed to carry two crew members and six passengers. It is launched into space using a carrier aircraft called White Knight 2. Once at a certain altitude, the VSS Unity is released, and its rocket engines are activated to reach a height of 100 kilometers, marking its entry into space.

At what altitude does the VSS Unity's rocket engines fire up?

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What is the minimum height the VSS Unity must reach to be considered in space?

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