Another space stock is going public. But this isn't just any old space stock -- this one already landed on the moon.

Northrop Grumman-backed Firefly Aerospace raised the proposed price range for its U.S. initial public offering on Monday and is now targeting a valuation of up to $6.04 billion in its U.S. listing, underscoring investor interest in space-related ventures.

Firefly Aerospace has said it expects to price shares in its upcoming IPO $35 to $39 a piece, a deal that would value the rocket maker at about $5.5 billion.