Get ready for some roaring new rockets in March.As many as three launchers that have never traveled to space could try to reach orbit in the coming month.Relativity Space, an American company, may be the first to fly.Its Terran 1 rocket is scheduled to lift off as early as March 8 from Cape Canaveral, Fla. Relativity's rocket is made mostly with 3-D printing and uses liquid oxygen and liquid methane as propellants.
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