SpaceX CEO Elon Musk. Photo: Chris Carlson/Associated Press

Elon Musk’s Space Exploration Technologies Corp. is raising another $500 million in funding amid internal questions about the viability of an internet-via-satellite business considered key to the company’s growth.

The fundraising, outlined in a regulatory filing last week, comes four months after a similarly sized deal for the closely held company, which is trying to accelerate development of its ambitious satellite venture, called Starlink, along with work on various rocket and spacecraft projects.

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