Planet Size Comparison 2023

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Alex Evett

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Published on May 8, 2023 10:18:39 PM ● Video Link: https://www.youtube.com/watch?v=c_nqwgsKw_E

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All measurements represent diameter.
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1. Hygiea - One of the smallest known possible dwarf planets, located within the asteroid belt.
2. Orcus - A trans-Neptunian object with a moon almost half its size.
3. Ceres - The largest object in the asteroid belt, and was widely considered a planet until the 1860s.
4. Sedna - Sedna is a red dwarf planet, with an aphelion of 937 AU and a perihelion of only 76 AU.
5. WD 1145+017 b - This planet orbits a white dwarf and is being slowly being vaporised by the star.
6. Haumea - Haumea is shaped like an egg because of its fast spin, giving it only a 4 hour day.
7. Eris - Eris is slightly more massive than its neighbour Pluto, but slightly smaller in size.
8. Pluto - Pluto was the first trans-Neptunian dwarf planet to be discovered.
9. Draugr - Draugr orbits a pulsar and is only twice as massive as the Moon. Its size is speculative.
10. Kepler-37b - As of yet the smallest known planet orbiting a main sequence star.
11. Mercury - Mercury is the closest planet to the Sun, completing one orbit in just 88 days.
12. Mars - Mars contains both the largest volcano and the largest canyon in the Solar System.
13. TRAPPIST-1e - the TRAPPIST-1 system contains 7 planets, 3 of which are in the star's habitable zone.
14. Venus - Along with Titan and Earth, Venus is one of the only planets of the Solar System with a substantial atmosphere.
15. Earth - It is theorised that intelligent life may exist on this planet's surface, though unlikely.
16. Proxima b - Proxima b is part of the closest star system to Earth, at only 4.25 light years away.
17. Kepler-186f - The first earth-sized planet discovered in the habitable zone of its parent star.
18. Phobetor - The first exoplanet discovered alongside Poltergeist. Both planets orbit a pulsar.
19. 55 Cancri e - Aprroximately 1 third of this planet may be composed of diamond.
20. Kepler-22b - It is possible that Kepler-22b has a global ocean, or possibly a thick gaseous other shell.
21. TOI-849 b - This planet's year is only 18 hours. If rocky, it is the largest known terrestrial planet.
22. Neptune - Neptune is the densest gas planet in the Solar System, and is more massive than Uranus.
23. Uranus - Uranus, while appearing bland and featureless itself, actually has 13 known rings.
24. Saturn - Saturn spins so fast that it has a 10% oblateness, flattening it at the poles.
25. Jupiter - Jupiter has 2.5 times the mass of all the other Solar System's planets combined.
26. COCONUTS-2b - This planet takes over a million years to orbit its parent star.
27. SWEEPS-11 - The most distant known exoplanet along with SWEEPS-04), 27,710 light years away.
28. SIMP J013656.5+093347 - A lonely planet with no star, called a rogue planet, though it may be a brown dwarf.
29. TrES-2b - The darkest known exoplanet, and reflects about 0.04% of the light that hits it.
30. KELT-9b - The hottest known planet, at an estimated temperature of 4000 degrees Celsius.
31. HAT-P-67 b - The largest known planet that is definitely not a brown dwarf..
32. TYC 8998-760-1 b - This planet is only around 17 million years old, as opposed to the Earth's 4.5 billion.
33. HD 100546 b - The higher bound measurement of the planet. It is not likely that HD 100546 b will remain this apparently big, as it is probably in the early stages of formation and is surrounded by debris.
34. J1407b Ring System - This ring system is 640 times as wide as Saturn's, and may contain moons similar in size to Earth.