Yes, blue clouds are real, specifically referring to Polar Mesospheric Clouds (PMCs), also known as noctilucent clouds.
According to the YouTube video "Rare Electric Blue Clouds Observed by NASA Balloon," these clouds:
- Form above Earth's polar regions.
- Exist at the upper reaches of the atmosphere, around 50 miles high.
- Are composed of ice crystals.
- Glow bright blue or white.
Therefore, while typical tropospheric clouds are not naturally blue, these high-altitude PMCs are indeed a real phenomenon where clouds can appear blue.
