Mercury
Mercury is the closest planet to the Sun, and the smallest planet in our solar system - only slightly larger than Earth's Moon.
Sun - NASA Science
The Sun is the star at the heart of our solar system. Its gravity holds the solar system together, keeping everything – from the biggest planets to the smallest bits of debris – in its orbit.
Earth Science Data - NASA Science
NASA’s Earth Science Data Systems (ESDS) Program oversees the entire Earth science data life cycle and facilitates unrestricted access to maximize the scientific return from NASA's missions and experiments.
Earth Multimedia & Galleries - NASA Science
NASA has a unique vantage point for observing the beauty and wonder of Earth while trying to make sense of it. Explore our galleries and multimedia.
Facts About Earth
Earth is the third planet from the Sun, and the fifth largest planet. It's the only place we know of inhabited by living things.