A spacecraft takes between about seven and nine months to reach Mars. The time depends on the spacecraft and the distance between the two planets, which changes as they follow their orbits around the Sun. NASA’s Perseverance is the most recent spacecraft to make the journey, and it took about seven months.
If it didn’t take so long, then Mars would be within reach of a human mission sooner rather than later. NASA is exploring the idea of using nuclear electric propulsion to shorten the travel time.
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