In 1880, without knowledge of the earlier work of Coulier, Aitken discovered the nuclei of cloudy condensation in the atmosphere. For nearly forty years he continued to make observations on these ...

The subsequent growth of these particles is thought to contribute approximately half of the global number of cloud condensation nuclei (CCN), substantially affecting cloud properties and Earth's ...

This is actually a known mechanism for the formation of cloud condensation nuclei, the tiny particles that water droplets condense onto and which are the genesis of clouds, Gramling says.

Early risers in Texas saw something a little bit unusual earlier this week. A rare display of “meteor smoke clouds” — ...