Living things, as we know them, need sunlight, water, and certain gases. We know that Earth has what living things need. It has the right amount of sunlight. And it has gases that plants and animals need to live. Just above Earth is its atmosphere.
Atmosphere is the air around an object in space.
Not all objects in space have an atmosphere. Its atmosphere is made up mostly of nitrogen and oxygen. Dust particles float inside the atmosphere. So do clouds and microbes. The clouds are water droplets that form rain.