Ursa Major Technologies is an American aerospace company founded in 2015 and based in Berthoud, Colorado.
The company makes a 5,000-pound thrust liquid oxygen and kerosene Hadley engine, named after a character in Ray Bradbury's The Veldt.
[1] It also develops the Ripley engine, with 50,000 pounds of thrust, aimed at the medium-launch market.
[4] In 2017, Ursa Major raised $8 million last with participation from the Space Angels Network.
[7] The company announced that it would supply the upper stage engine for Astra Space’s in-development Rocket 4.