Have you ever gazed up at the sky and seen clouds that resemble waves in an ocean? These aren't your everyday fluffy cumulus clouds or storm clouds. These are gravity wave clouds -- a fascinating ...

Identifying images with and without clouds among hundreds of thousands ... Brasil et al, Atmospheric Gravity Waves in Mars' Lower Atmosphere: Nadir Observations From OMEGA/Mars Express Data ...

Atmospheric gravity waves occur naturally in Earth's atmosphere ... that had never been encountered before. "Reflections from clouds and the ground can obscure some of the images, and we want ...