Interstellar space clouds, also known as NEBULAE, are large clouds of gas and dust located in the space between stars. They are composed of hydrogen, helium, and other elements, and can be seen in the night sky as faint patches of light. NEBULAE are often associated with star formation, as they are the birthplace of new stars. They can also be the remnants of supernovae, which are the explosive deaths of massive stars.