What type of cloud is made out of ice crystals?

Is Orion getting larger? What energy would be used in a nuclear reaction in a star? What happens to a star when the outward force of fusion is less than the inward force? What do you need to know about the moon? What is a day having 12 hours of sulight and 12 hours of darkness? Along with shape and size which property distinguishes spiral galaxies elliptical galaxies and irregular galaxies from one another? What layer in the atmosphere has most meteoroids break up? Why do clouds go dark before it rains? What are the Factors affecting extinction angle? When was Jim Lovell suppose to go back to the moon? Why can't we see moon in daylight? What are the basic elements of satellite communication systems? What is the name of red moon and orange what is the name of red moon and orange moon? Who was the man who orbited the moon while his team members set foot on the lunar surface? A characteristic of the space shuttle is that? When the gravitational pulls down the sun and moon partially cancel each other out earth experiences a tide? Is Apollo related to eos? What type of star is Merak? What were the moonrise times in 2018? Who was the name of the person who invented the compass?