Tesla CEO Elon Musk said on Tuesday evening, after the successful launch of the SpaceX rocket FalconHeavy earlier in the day, that he hopes for another major test launch in 3-4 years.

What is it: The Big F*ing Rocket, or BFR, will be SpaceX's workhorse. If all goes according to plan, it will debut in the 2020s, and replace the Falcon9 and FalconHeavy spacecraft. Musk currently plans to create several models: one will take humans to the other side of the planet, and some might take them to the moon or other planets.