You're likely talking about the Moon, which appears white (or sometimes a pale yellow, orange, or red) in the night sky.

However, there are other things in the night sky that can look white:

* Planets: Venus, Jupiter, and Saturn can appear as bright white objects.

* Bright stars: Some stars are incredibly bright and can appear white.

* Artificial satellites: These can look like moving white lights.

If you're trying to figure out exactly what you're seeing, try these tips:

* Does it move? The Moon and planets appear to move slowly across the sky, while satellites move much faster.

* Is it bright? The Moon is usually the brightest object in the night sky, while planets and stars vary in brightness.

* Is it changing color? The Moon can appear different colors depending on the weather and its position in the sky.

Let me know if you have any more details about what you're seeing, and I can help you identify it!