Universe
Earth belongs to the solar system inside the Milky Way, one of many galaxies in the universe, where light-years express immense distances.
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Earth's Cosmic Address and the Light-Year Scale
Earth belongs to the solar system inside the Milky Way, one of many galaxies in the universe, where light-years express immense distances.
Open article →Sun, Planet Order and Orbital Patterns
The Sun dominates the solar system, while eight ordered planets follow gravitational orbits and mostly rotate from west to east.
Open article →Planetary Geography Beyond Earth and Jupiter
Mercury, Venus, Mars, Saturn, Uranus and Neptune illustrate contrasting atmospheres, surfaces, rotations, rings, colours and solar distances.
Open article →Moon, Dwarf Planets and Small Solar Bodies
Dwarf planets, the Moon, asteroids, comets, meteors and meteorites occupy distinct paths and display different structures and behaviours.
Open article →Earth's Axis, Rotation and Day-Night Cycle
Earth's spherical shape, tilted axis and west-to-east rotation expose one hemisphere at a time to sunlight, producing day and night.
Open article →Earth's Revolution, Seasons, Equinoxes and Solstices
Earth's 365¼-day revolution and axial inclination organise the year, leap years, seasons, equinoxes and opposite solstices in both hemispheres.
Open article →Lithosphere, Hydrosphere, Atmosphere and Biosphere
Earth's solid land, water, air and narrow life zone interact with a suitable climate to make the planet habitable and organise ecosystems.
Open article →Article access
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