Even though the mission is planned for one Martian year — 687 Earth days — the new explorer comes strapped with a nuclear power source that will sustain for at least another 88 years.
Plutonium-238 has always been the ideal candidate for deep-space travel. As the pellets decay, the heat generated creates electricity when running through thermoelectric generators. The electricity is used to charge the Perseverance rover’s lithium-ion batteries, which powers both the rover and all of its instruments.