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The listed objects currently include most objects in the asteroid belt and moons of the giant planets in this size range, but many newly discovered objects in the outer Solar System are missing, such as those included in the following reference. [58] Asteroid spectral types are mostly Tholen, but some might be SMASS.
It was the smallest known star from 1948 to 1981. [105] TRAPPIST-1: 82,925: Hosts a planetary system with at least seven rocky planets. [106] LHS 2090: 83,500 [107] Teegarden's Star: 83,500 Has two potentially habitable planets. [108] VB 8: 84,450 [105] SPECULOOS-3: 85,570 Second-smallest star known to host a transiting exoplanet after TRAPPIST ...
Listed below are galaxies with diameters greater than 700,000 light-years. This list uses the mean cosmological parameters of the Lambda-CDM model based on results from the 2015 Planck collaboration, where H 0 = 67.74 km/s/Mpc, Ω Λ = 0.6911, and Ω m = 0.3089. [3]
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
The most massive to explode would be just below the Chandrasekhar limit at around 1.41 solar masses and would take of the order of 10 1100 years, while the least massive to explode would be about 1.16 solar masses and would take of the order 10 32 000 years, totaling around 1% of all black dwarfs.
Preon stars would be expected to have huge densities, exceeding 10 23 kilogram per cubic meter – intermediate between quark stars and black holes. Preon stars could originate from supernova explosions or the Big Bang; however, current observations from particle accelerators speak against the existence of preons. [citation needed]
Additionally, astronomers have found 6 white dwarfs (stars that have exhausted all fusible hydrogen), 21 brown dwarfs, as well as 1 sub-brown dwarf, WISE 0855−0714 (possibly a rogue planet). The closest system is Alpha Centauri , with Proxima Centauri as the closest star in that system, at 4.2465 light-years from Earth.
Theoretical limit of star size (Andromeda Galaxy) ≳1,750 [11] L/T eff: Estimated by measuring the fraction of red supergiants at higher luminosities in a large sample of stars. Assumes an effective temperature of 3,625 K. Reported for reference: Theoretical limit of star size (Triangulum Galaxy) ≳1,500 [11] L/T eff