The Vasimr rocket is not used for launching things.
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Now, the company is firing Vasimr for about five minutes at a time.
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Argon is used as a propellant in the development of the Variable Specific Impulse Magnetoplasma Rocket Vasimr.
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But to realize that potential, Houston-based Ad Astra Rocket Company
must first demonstrate that its plasma rocket, Vasimr, can fire continuously for a long period of time.