text: A speculative NASA project seeks to send small, spiky, “hedgehog” probes to explore a moon of this planet.
full_question: A speculative NASA project seeks to send small, spiky, “hedgehog” probes to explore a moon of this planet. In 2011, Russia launched a probe named “grunt” or “ground” intended to sample a moon of this planet, but it never left the earth’s orbit. This planet’s largest, tidally locked moon has a decaying orbit and will be destroyed within fifty million years. Asaph Hall discovered this planet’s moons, which were photographed by the rovers Spirit and Opportunity. For 10 points, identify this planet whose two moons are named Deimos and Phobos.
first_sentence: A speculative NASA project seeks to send small, spiky, “hedgehog” probes to explore a moon of this planet.