Sometimes it is difficult to write objectively about the rate at which SpaceX makes progress. The advancements we’re seeing at the company’s Starbase site in South Texas are unprecedented.

Like, seriously unprecedented.

On Sunday, SpaceX finished stacking what it is calling “Booster 4,” the first of its Super Heavy rocket boosters expected to take flight. This is a massive, single-core rocket that is approximately 70 meters tall, with a diameter of 9 meters. It has a thrust approximately double that of the Saturn V rocket that launched NASA astronauts to the Moon.