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Universe Sandbox is a series of simulation video games.In Universe Sandbox, users can see the effects of gravity on objects in the universe and run scale simulations of the Solar System, various galaxies or other simulations, while at the same time interacting and maintaining control over gravity, time, and other objects in the universe, such as moons, planets, asteroids, comets, and black holes.
Visual comparison of the sizes of Earth and the Moon (above right) and Pluto–Charon (below right). In astronomy, a double planet (also binary planet) is a binary satellite system where both objects are planets, or planetary-mass objects, and whose barycenter is external to both planetary bodies.
The dwarf planet Pluto and its moon Charon are often described as a binary system in the Solar System, which orbit the Sun Main article: Binary asteroid When binary minor planets are similar in size, they may be called " binary companions " instead of referring to the smaller body as a satellite. [ 3 ]
The default setting for Celestia's Earth is a spheroid. The irregular surface of the Earth causes low Earth orbit satellites to appear to be in the wrong places in the sky when watched from the surface, even when the Earth's oblateness is specified, as Celestia does not simulate 3D surfaces.
Planets that orbit just one star in a binary pair are said to have "S-type" orbits, whereas those that orbit around both stars have "P-type" or "circumbinary" orbits. It is estimated that 50–60% of binary stars are capable of supporting habitable terrestrial planets within stable orbital ranges. [4]
In the Trigun series, the planet orbits a binary star system. In the Star Wars series, the planet Tatooine orbits in a close binary system. In the series Doctor Who, a binary system with such a planet is featured in The Chase. "Gridlock" also depicts the planet Gallifrey as in a binary system, but possibly in a non-circumbinary orbit. [69]
The binary system is known to host three planets, all orbiting close to each other and larger than Earth, with no solid surface. [3] All three of the planets in the Kepler-47 system have a very low density, less than that of Saturn. [18] [19] The densities of the planets are estimated to be around 0.26 g/cm 3 to 0.68 g/cm 3. [3]
Kepler-14 is a binary star system targeted by the Kepler spacecraft. It is host to one known planet: the Jupiter-like Kepler-14b.The star system was identified by Kepler as a possible planetary host, but when imaging revealed that Kepler-14 was a binary star system and not a single star, the confirmation process became protracted.