What are large fluffy clouds called?

Which of these signals the beginning of fall? Is the Moon's sister is the sun? Is a new moon good luck? How do astronautes control temperature in space? How does solar energy gives rise to winds? If you shine a flashlight into the night Sky how fast will its light travel? How many people ever landed on moon? How to launch a spaceship in civilization IV? Planet X will really hit your earth or not? Why the Andromeda constellation named so? What is the difference between a meteor and meteroid? Why is the Earth's surface warmer than the surface of other planets like Mars? Which object has the greatest density twenty kilograms of cement twenty kilgrams of feathers twenty kilograms of paperclips twenty kilograms of plastic bottels? What enables a rocket to be launched into the air? What does spectral disturbance mean? How do you calculate moon phases and their corresponding dates accurately? How quickly is the moon moving away from earth? Can you look at a solar eclipse directly? What did sputnik look like in the sky? Which of the following would be considered the Sun's fuel?