Gallium Arsenide Solar Panels: Powering Mars Rovers Beyond Earth’s Limits

When NASA's Perseverance rover landed on Mars in 2021, its solar panels faced an environment 142 million miles from ideal conditions. The Red Planet's atmosphere filters only 40% of sunlight compared to Earth, while nighttime temperatures plunge to -73°C (-100°F). Conventional silicon-based panels - the kind powering your neighbor's rooftop - would fail within weeks under such extremes.