What is the greatest source of natural light at night?

The Moon is the greatest source of natural light at night because it reflects sunlight, which is substantial enough to illuminate the landscape and sky. When the Moon is full, its brightness can significantly enhance nighttime visibility compared to other natural sources. While stars do emit light, their distance and relative dimness result in much less illumination compared to the Moon. Streetlights, while bright, are not natural sources of light, and cloud cover usually obscures the Moon and stars rather than contributing to night illumination. Thus, the Moon stands out as the primary natural light source during the night.