Water vapor is water in a gas state, versus a liquid or solid state. Therefore, water vapor is invisible. On water vapor imagery, a certain wavelength is used that is sensitive to moisture from our ...

The visible and gaseous form of water is water vapor, and water vapor occurs in highly variable amounts in the atmosphere. It is always present in air, though it is present in very small amounts in ...

Researchers using the Hubble Space Telescope have discovered water vapor in the atmosphere of planet K2-18b, located about ...