Solar day on Earth is approximately 24 hours due to elliptical orbit. Sidereal day on Earth is exactly 23 hours and 56 minutes
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
Earth has a day of 23 hours 56 minutes. Moon rotates once every 29.5 days. Scientists measure other planets' days relative to Earth's
Ceres was discovered by Giuseppe Piazzi in 1801 as the first known asteroid. It orbits between Mars and Jupiter at 4.6 Earth years. Ceres is classified as both asteroid and dwarf planet. Its diameter is about a quarter that of the Moon
Ring systems are discs or toruses composed of solid material around astronomical objects. All four giant planets (Jupiter, Saturn, Uranus, Neptune) have ring systems. Saturn's rings are most extensive, containing water ice and trace amounts of rock. Uranus has 13 rings, mostly dark and opaque, with limited dust. Neptune's rings are faint and dusty, with 20-70% being dust
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