EXPOSITION PARK, LOS ANGELES (KABC) -- We're getting a look inside what could soon become one of L.A.'s most popular attractions. The California Science Center is showing off some of the artifacts inside its new expansion.

For the first time, it's starting to look less like a construction site and more like a full-scale museum.

At the future Samuel Oschin Air and Space Center, the very first artifacts are now in place, with more to come on humans and robots in space, and the rockets that get them there.

On Tuesday, several pieces made their debut, including a Rocket Lab Electron Rocket and part of a 12-foot-wide shuttle booster segment that visitors can walk through. They're not just models, but real equipment that has been on missions.

The center will also be home to NASA's final spa

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