Air is the invisible mixture of gases that surrounds our planet, primarily composed of nitrogen and oxygen. It is essential for life on Earth, as it provides the oxygen we breathe and plays a crucial role in weather patterns and climate. The atmosphere, which is the layer of air around the Earth, protects us from harmful solar radiation and helps regulate temperature. Space, on the other hand, refers to the vast, seemingly empty expanse beyond Earth's atmosphere. It is home to celestial bodies such as stars, planets, and galaxies. In space, there is very little air, which means sound cannot travel, and temperatures can vary dramatically. Exploring space has led to significant advancements in science and technology, including the development of spacecraft and satellites.