As scientists and space enthusiasts commemorate the Hubble Space Telescope's 35 years in orbit, the mission team joined in by ...

Martian clouds are made of either water ice, or—at higher altitudes and lower temperatures—carbon dioxide ice. (Mars's atmosphere is more than 95% carbon dioxide.) The latter are the only kind ...

Some plumes descend to 50 kilometers before evaporating in the rising temperatures. Twilight clouds on Mars were first observed during NASA's Pathfinder mission in 1997. Curiosity's recent ...

They're made up of frozen carbon dioxide, which you may know as dry ice, which reflects light in these colours. The clouds have only been spotted a few times in Mars' Southern Hemisphere.