How do scientists send a spacecraft to a specific planet at the right time?
Quick Answer
They launch during a planetary alignment called a launch window, when the orbital paths make the trip efficient.
The Full Story
Planets are always moving, so mission planners wait for a launch window when the geometry between Earth and the target planet minimizes travel time and fuel use. These windows are based on orbital mechanics and can occur only every so often, depending on the planets involved. For Mars, favorable launch windows typically come about every 26 months. The exact path also depends on the spacecraft's speed, desired arrival date, and whether gravity assists are being used.
Key Facts
YouTube Angle
Suggested video title for this topic:
"You can't launch to another planet any time you want — the Solar System has a schedule."
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