universe
The universe means the totality of all that physically exists: matter, energy, space and time, and the laws that link them in a unified framework.
Read more →Astronomy
Galaxy
A gravitationally bound assembly of stars, gases, dust, and dark matter, a galaxy forms a coherent structure often centered around a denser region.
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Stellar System
A stellar system is a gravitational arrangement around a star, with various orbiting bodies forming a hierarchical and stable structure in space.
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Star
A star is a celestial body of fusing matter, maintaining equilibrium through gravity and emitting energy produced by internal nuclear reactions.
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Planet
A planet is a celestial body orbiting a star, with enough mass to become spherical and to clear other significant objects from its orbital neighborhood.
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Moon
A moon is a natural satellite orbiting a planet or a more massive object, playing an important role in gravitational balance and tidal phenomena.
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Asteroid
An asteroid is a rocky body orbiting a star, often located in zones of gravitational transition, smaller than planets and lacking an atmosphere.
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Comet
A comet is an icy small body orbiting a star, developing a coma and a tail when approaching stellar radiation.
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Dwarf Star
A dwarf star is a type of star with small size and low luminosity, belonging to the longest or final phases of stellar evolution, with highly diverse structural characteristics.
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Terrestrial planet
A terrestrial planet is a solid celestial body characterized by a rocky surface, high density, and a differentiated internal structure.
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Gas giant planet
A gas giant planet is a massive celestial body without a solid surface, mainly composed of hydrogen and helium, with an internal structure governed by pressure and phase transitions.
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Ice Giant Planet
An ice giant planet is a massive celestial body primarily composed of water, methane, and ammonia, with a layered internal structure and a complex atmosphere.
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