Space clouds are a type of astronomical object that can be found in the interstellar medium. They are composed of dust, hydrogen, helium, and other ionized gases. The two crossword solutions for the term SPACE CLOUDS are NEBULAE and NEBULAS. NEBULAE are large clouds of gas and dust in space, while nebulas are smaller clouds of gas and dust. Both types of space clouds are often visible to the naked eye and can be seen in the night sky.