Elon Musk, founder of SpaceX, said on Saturday that the first orbital stack of the Starship rocket would be ready in the coming weeks, taking the unconventional billionaire a step closer to his dream of orbital and interstellar travel.

In May, SpaceX successfully landed its Starship prototype SN15, a reusable heavy carrier rocket capable of sending astronauts and large cargo payloads to the moon and Mars.

The landing was successful after four prototype landing attempts ended in an explosion.

"the starship's first orbital stack will be ready to fly in a few weeks, just waiting for regulatory approval," Musk wrote on social media. "

This Tesla, Inc.At the heart of the company's CEO ambitions is to make human space travel more economical and routine.

A starship-orbiting flight is planned for the end of the year, and Musk has said he plans to fly around the moon in a starship in 2023 for Japanese billionaire entrepreneur Tomoto Maezawa.