Suppose a person built a Sandcastle off of the moon on the moon. What would that person find there a month later

If a person were to build a sandcastle on the moon, it would likely stay intact for a long period of time due to the moon's lack of atmosphere and extreme temperature variations. So, a month later, that person would find the sandcastle still standing and relatively unchanged.

However, there are a few factors to consider:

1. Vacuum environment: The moon's surface experiences a vacuum environment with no air or wind that can erode or reshape the sandcastle. So, unless it gets hit by an external force like a meteorite, the sandcastle will remain as it was built.

2. Temperature extremes: The lunar surface features extreme temperature variations. During the lunar day, the temperature can reach around 260°F (127°C), while during the lunar night, it drops to about -280°F (-173°C). These extreme temperatures might cause thermal stress, which could potentially crack the sandcastle or affect its structural integrity.

3. Particle bombardment: The moon is constantly bombarded by micrometeoroids. These small particles can impact the surface and potentially damage or alter the sandcastle over time. However, since a sandcastle is not a permanent structure, it might not be significantly affected.

4. Lack of water: The moon is devoid of liquid water, which plays a crucial role in maintaining the shape and stability of sandcastles. Without water, the sandcastle's structure might not hold up as well as it would on Earth.

Considering these factors, while the sandcastle may still exist on the moon a month later, it could have potentially experienced some minor changes or deterioration due to temperature variations and micrometeoroid impacts.