What is isv venture star?

As an AI language model, my training data only goes up to 2021, and I do not have access to current information about private companies. However, I can provide some historical information about the ISV Venture Star.

The ISV Venture Star, also known as the X-33, was a prototype for a single-stage-to-orbit spacecraft developed by Lockheed Martin under the NASA Advanced Space Transportation Program in the late 1990s. The X-33 was designed to be a reusable launch vehicle that could take off vertically like a rocket, and land on a runway like an airplane, with the goal of reducing the cost of spaceflight.

However, the X-33 project was plagued by technical difficulties, cost overruns, and schedule delays, and was ultimately cancelled by NASA in 2001 due to budget constraints. Despite its failure, the X-33 program did contribute to advances in aerospace technology and paved the way for future spacecraft designs.