Moon's radius is 1,079.6 miles (1,737.5 km) and diameter is 2,159.2 miles (3,475 km). Moon is 27% of Earth's size, making it fifth largest moon in solar system. Surface area is 14.6 million square miles (38 million square km). Moon's mass is 7.35 x 10²² kg, 1.2% of Earth's mass
Sun is the closest star at 8.5 light-minutes, located 149 million km away. Alpha Centauri system consists of three stars: A, B, and Proxima at 4.37-4.24 light-years. Proxima Centauri may have a rocky planet, according to astronomers
Webb orbits Sun at 1.5 million kilometers from Earth. Telescope folds origami-style and unfolds like a "Transformer". Features 5-layer sunshield with SPF 1 million protection. Will study first galaxies born after Big Bang over 13.5 billion years
Celebrating 35 years of discovery with monthly stargazing challenge. Servicing Mission 3A occurred December 19-27, 2024. NASA mobile app offers interactive Hubble resources
The Solar System formed 4.6 billion years ago from a molecular cloud's collapse. The Sun contains 99.86% of the system's mass and is a G2 main-sequence star. The system is divided into the inner (terrestrial) and outer (giant) regions
Stars are celestial bodies made of hot gases. They are created through thermonuclear reactions. Stars radiate energy from thermonuclear reactions. They power life on Earth and hold our solar system together