Why does ice remain to stay frozen on the moon?

Ice remains frozen on the Moon primarily due to its lack of atmosphere and the extreme temperatures that can drop to about -250 degrees Fahrenheit (-157 degrees Celsius) in permanently shadowed craters. These areas, especially near the poles, receive little to no sunlight, creating a cold trap where temperatures remain low enough for water ice to persist. Additionally, the Moon's low gravity prevents the escape of water molecules, further contributing to the stability of ice in these regions.