Rocket Lab, a company recently valued at $1 billion by private investors, has been waiting since May 22 to test its first product, a rocket called Electron designed to launch small satellites into orbit. Its outer shell is made almost entirely of carbon fiber, and it boasts an electric turbopump and a 3-D printed engine. A successful launch will provide key data to refine the rocket’s construction, and validate the hopes of both the company’s backers and a slew of other small satellite firms desperate to see their own technology put into space.