1. The coldest layer: The mesosphere is the coldest layer of Earth's atmosphere, with temperatures reaching as low as -90°C (-130°F). This is due to the limited amount of solar radiation reaching this layer, and the absence of significant heat absorption from the ground.

2. Home to meteors: Most meteors burn up in the mesosphere, creating the bright streaks of light we see as "shooting stars." The thin atmosphere and high speeds cause friction, heating the meteor to incandescence.

3. No weather phenomena: The mesosphere is too thin to support significant weather phenomena like clouds or storms. However, it does have a layer of charged particles known as the D-region, which plays a role in radio wave propagation.