A test-firing of a Raptor engine on the latest in a series of Starship test rockets Tuesday night in Texas moved SpaceX closer to performing a low-altitude “hop” to gather data on the vehicle’s launch and landing characteristics.

SpaceX’s first Falcon Heavy rocket, made up of two previously-flown Falcon 9 boosters and a beefed up central core stage, made the trip to launch pad 39A at NASA’s Kennedy Space Center in Florida and was raised vertical Thursday for testing ahead of its first liftoff next month.

SpaceX is gearing up for the first full-up test-firing Thursday of all 33 engines on the booster for the company’s Starship mega-rocket in Texas, a critical milestone on the path to launching the giant vehicle on its first orbital test flight, which could happen as soon as March if this week’s test goes well.