Firefly also boosted the size of the IPO. It will raise nearly $870 million from the stock sale. It is selling 19.3 million shares, up from an original proposal of 16.2 million shares. The stock will trade on the Nasdaq under the ticker symbol FLY.

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

Firefly Aerospace soared in its public market debut Thursday, beginning trading at $70, over 55% higher than its IPO price. The Cedar Park-based company secured a $9.8 billion valuation.