SpaceX, the space exploration company, has filed preliminary paperwork to sell shares to the public, potentially making founder Elon Musk the world's first trillionaire. The IPO, set to take place in June, is expected to raise as much as $75 billion and could significantly exceed Saudi Aramco's $29 billion in its 2019 IPO. The company, which already owns 42% of the company, could value all its shares at $1.5 trillion, nearly double what it was valued in December when some minority owners sold their stakes. The move could raise tens of billions for Musk's ambitions to set up a base on the moon, establish datacenters the size of several football fields in orbit, and possibly send a man to Mars. The announcement of the IPO has raised concerns about conflicts of interest given Musk was the biggest donor to President Donald Trump's campaign and is still a significant backer.