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Habitable zone
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In astronomy and astrobiology, the habitable zone (HZ), or more precisely the circumstellar habitable zone (CHZ), is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure. The bounds of the HZ are based on Earth's position in the Solar System and the amount of radiant energy it receives from the Sun. Due to the importance of liquid water to Earth's biosphere, the nature of the HZ and the objects within it may be instrumental in determining the scope and distribution of planets capable of supporting Earth-like extraterrestrial life and intelligence.
A diagram depicting the habitable zone boundaries around stars, and how the boundaries are affected by star type. This plot includes Solar System plan
A diagram depicting the habitable zone boundaries around stars, and how the boundaries are affected by star type. This plot includes Solar System planets (Venus, Earth, and Mars) as well as especially significant exoplanets such as TRAPPIST-1d, Kepler-186f, and our nearest neighbor Proxima Centauri b.
Natural shielding against space weather, such as the magnetosphere depicted in this artistic rendition, may be required for planets to sustain surface
Natural shielding against space weather, such as the magnetosphere depicted in this artistic rendition, may be required for planets to sustain surface water for prolonged periods.
Earth's hydrosphere. Water covers 71% of Earth's surface, with the global ocean accounting for 97.3% of the water distribution on Earth.
Earth's hydrosphere. Water covers 71% of Earth's surface, with the global ocean accounting for 97.3% of the water distribution on Earth.
Artist's concept of a planet on an eccentric orbit that passes through the HZ for only part of its orbit
Artist's concept of a planet on an eccentric orbit that passes through the HZ for only part of its orbit
Solar System
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The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It was formed 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is an ordinary main sequence star that maintains a balanced equilibrium by the fusion of hydrogen into helium at its core, releasing this energy from its outer photosphere.
Montage of the largest bodies in the Solar System. The asteroid belt and Kuiper belt are not added because the individual asteroids are too small to b
Montage of the largest bodies in the Solar System. The asteroid belt and Kuiper belt are not added because the individual asteroids are too small to be shown.
Diagram of the early Solar System's protoplanetary disk, out of which Earth and other Solar System bodies formed
Diagram of the early Solar System's protoplanetary disk, out of which Earth and other Solar System bodies formed
The Sun in true white color
The Sun in true white color