On the Red Planet, the clouds are not just water ice like on Earth, but can also be made of dry ice. Most of the thin ... and was sure at first it was some color artifact,” Mark Lemmon, an ...

The clouds, known as noctilucent or twilight clouds, contain frozen carbon dioxide, or dry ice. They are tinted with colors when the setting Sun scatters light. That color has led to them being ...

Who should complete this course? Are you a UAB Employee mailing shipments refrigerated with Carbon Dioxide (Dry Ice)? If so, per the Hazardous Materials regulation, it is required to complete this ...