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This is a list of objects for comparison in terms of orders of magnitude for different lengths.

Name of Object Type / Classification Measurement Image (click for full size) Notes
Planck Length and Quantum Foam Hypothetical subatomic particle 10^-36 meters Believed to be the smallest thing possible. Anything smaller makes "no physical sense"
String theory 10^-36 meters String theory.svg 11 dimensional objects infinitely larger than the Planck Length.
Antiquark 10^-25 meters? Quark Anticolors.svg The much smaller antimatter counterpart of quarks.
MeV Neutrino 10^-23 meters
Preon 10^-21 meters Hypothetical building block of Quarks.
High-energy Neutrino
Quark Subatomic particles 10^-18 meters Quark Colors.svg.png Building block of Hadrons.
Electron Electron en rotation.jpg Negatively charged atomic particle.
Proton 10^-15 meters Wpdms physics proton proton chain 2bis.png Positively charged hadron.
Neutron Hadron with no charge.
Atomic Nucleus Group of subatomic particles 10^-14 meters Nucleus drawing.svg

1 angstrom (10^-10 meters)

Hydrogen Element atom 10^-10 meters Bohr model Hydrogen.svg First element on the Periodic Table
Carbon Carbon-atom.jpg 6th element
Nitrogen Nitrogen (7 N).jpg 7th element; makes up 78% of any sample of air
Oxygen Hand oxygen mixer.JPG 8th element
Chlorine Electron shell 017 Chlorine.svg 17th element
Sulphur Soufresicile2.jpg 16th element
Water Molecule H2O (water molecule).jpg Compound of hydrogen and oxygen
Uranium Element atom Ames Process uranium biscuit.jpg 92nd element
Caesium Electron shell 055 caesium.png 55th element
Hemoglobin Molecule 10^-9 meters Oxygen-Haemoglobin dissociation curves.svg Iron-containing component of blood
HIV virus Virus 10^-8 meters Comparative size of gluten vs HIV virus.png
DNA Molecule 10^-7 meters DNA replication en.svg
Nanobe Hypothetical organism 10^-7 meters No evidence has shown that these are even living organisms that contain DNA.
Wavelength of violet light Electromagnetic Radiation 4 - 4,5 x 10^7 meters[1] VisibleEmrWavelengths.svg
Wavelength of blue light 4,2 x 10^7 meters
Wavelength of green light 4,5 x 10^7 meters
Wavelength of blue-green light 5,1 x 10^7 meters
Wavelength of yellow light 5,5 x 10^7 meters
Wavelength of orange light 6,3 x 10^7 meters
Wavelength of red light 6,35 - 7 x 10^7 meters[2]
1 micron (μm)
Platelet Cell 10^-6 meters Red White Blood cells.png
Red Blood Cell
White Blood Cell 0.7 - 3 x 10^-5 meters[3]
Cloud Water Droplet Compound Iridescent clouds during snowfall 1.jpg
Paramecium Protist 10^-4 meters Paramecium contractile vacuoles.jpg
Green Euglena Eukaryote Euglena.svg
Skin Cell Cell Skin cells.JPG
Thiomargarita Namibiensis Bacterium 1 - 7,5 x 10^-4 meters[4][5] Sulphide bacteria crop.jpg Largest known bacteria.
1 millimeter (mm)
1 centimeter (cm)
«Penny» Currency 10^-2 meters US penny 2003.jpg
.44 Magnum Gun Bullet 79-74-A North Vietnamese Machine Gun Bullet (4865854193).jpg
Lilliputian Mammal 1.41 * 10^-2 meters Dreams in Lilliput- or Fleuron T078878-21.png Citizens of the fictional island of Lilliput (see below).
Leaf Plant organ ~5-9 * 10^-2 meters Silverweed leaf 800.jpg
Apple Fruit Red Apple.jpg
Orange Orange-fruit-2.jpg
Electroweak star Hypothetical star 1 * 10^-1 meters HD 38735 in Celestia.jpg Hypothetical type of star with their cores being the size of an apple.
House Cat Mammal ~3 * 10^-1 meters P1000911 European house cat.jpg
1 meter (m)
Daniel Lorraine Fictional human 1.71 meters 40px Character from the children's television sitcom Martha Speaks; partly based on the protagonist of Danny Phantom
Oak Tree Plant 8 meters Oak tree, Barnston.jpg
Tyrannosaurus Rex Dinosaur 10 meters TRex3.jpg
Hubble Space Telescope Spacecraft 14 meters Hubble Telescope at Smithsonian.jpg
Brobdingnagian Mammal 22 meters[6] Gulliver in Brobdingnag 1.png Citizens of the fictional monarchy of Brobdingnag (see below).
Cassini-Huygens Spacecraft 22 meters Cassini-huygens anim.gif Spacecraft that dived into Saturn's atmosphere on September 2017.
Galileo 25 meters Detailed Drawing of the Galileo Spacecraft.png Spacecraft that dived into Jupiter's atmosphere.
Blue Whale Mammal 29,9 meters[7] Blow of a blue whale in the Arctic sea.jpg
1998 KY26 Asteroid 30 meters Asteroid 1998 KY26 cropped.jpg
2007 HJ 37 meters 433eros.jpg The object in the Solar System that spins the fastest.
B2 Stealth Bomber Aircraft 52 meters B-2 Spirit original.jpg Costing over 2 billion dollars to make, it is the most expensive aircraft.
Depth of Champagne Pool Depth of a hot spring 62 meters ChampagnePool-Wai-O-Tapu rotated MC.jpg Famous Hot Spring in Icons-flag-nz.png New Zealand.
Statue of Liberty Copper Statue 93 meters[8] Statue of Liberty 4.jpg
Hyperion Tree California Redwood 115,92 meters[9] California Redwood Trees.jpeg Tallest known tree.
GT International Tower Building 217 meters
Gran Torre Santiago 261 meters
City of Capitals 301,59 kilometers
The Shard 310 meters
Empire State Building 386 meters
Taipei 101 439.2 meters
Burj Khalifa 828 meters
Angel Falls Waterfall 979 meters Tallest waterfall.
1 kilometer (km)
Old Rag Mountain Mountain 1,001 meters Old Rag Mountain from Skyline Drive.jpg
The Golden Gate Bridge Suspension Bridge 1,3 kilometers Sea of Fog, San Francisco.jpg
Dactyl Moon of 243 Ida 1.4 kilometers Dactyl-HiRes.jpg
Lilliput Fictional island 1.6 kilometers Dreams in Lilliput- or Fleuron T078878-21.png Fictional island nation from the book Gulliver's Travels by Jonathan Swift.
Le Conte Mountain 2 kilometers
The Fortress 3 kilometers
Les Droites 4 kilometers
Puncak Jaya 4,88 kilometers[10] Highest mountain in Australia (the continent).
Vinson Massif 4,89 kilometers[11] Highest mountain in Antarctica.
PSR B0943+10 Neutron star 5,2 kilometers Pulsar 2.jpg The smallest known pulsar.
Elbrus Mountain 5,64 kilometers[12] Elbrus.jpg Highest mountain in Europe.
Kilimanjaro 5,9 kilometers[13][14] Kilimanjaro from Amboseli.jpg Highest mountain in Africa.
Denali 6,19 kilometers[15][16] Parque nacional y reserva Denali, Alaska, Estados Unidos, 2017-08-30, DD 72.jpg Highest mountain in North America.
Chimborazo 6,26 kilometers[17] A mountain in Ecuador that is the closest point on Earth to the Moon because of the Earth's equatorial bulge.
Aconcagua 6,96 kilometers[18] Highest mountain in South America.
Everest 8,85 kilometers[19] 20110810 North Face of Everest Tibet China Panoramic.jpg Highest mountain in Asia; highest mountain from sea level.
Mauna Kea ~10 kilometers[20] Highest mountain in the United States and the world when measured from base (below sea level) to summit. Not located on any continent.
Deimos Moon of Mars 12,4 kilometers[21] The smallest moon of Mars; it was the smallest known moon for a while.
PSR J0348+0432 A Neutron star 13 kilometers[22] Artist’s impression of the pulsar PSR J0348+0432 and its white dwarf companion.jpg
2123 Vltava Koronis Asteroid 15 kilometers Minor planet named after the longest river in Icons-flag-cz.png Czechia (see below).
Ikeya-Zhang Comet
Halley's Comet 15,2 kilometers
Epimetheus Moon of Saturn 15.4 kilometers[23]
PSR B1257+12 Neutron star 20 kilometers[24][25][26] Artist's concept of PSR B1257+12 system.jpg Neutron star with three planets.
PSR B0531+21 The Crab Pulsar in Taurus (30796954192).jpg
Geminga Geminga by Chandra and Spitzer.jpg
Vela Pulsar Vela Pulsar jet.jpg
XTE J1739-285 Quark star 21.8 kilometers[27] XTEJ1739m285.jpg
Phobos Moon of Mars 22 kilometers[28]
Telesto Moon of Saturn 24 kilometers
Pan 25,7 kilometers
Hale-Bopp Comet 26 kilometers
Prospero Moon of Saturn 30 kilometers
Helene 32 kilometers
433 Eros Asteroid 32,6 kilometers
243 Ida Koronis Asteroid 31.4 kilometers[29]
Nix Moon of Pluto 46 kilometers
Naiad Moon of Neptune 67 kilometers
WeyWot Moon of 50000 Quaoar 74 kilometers
Belinda Moon of Uranus 90 kilometers
Prometheus Moon of Saturn 93,6 kilometers
Epimetheus 106,6 kilometers
Sjælland Island 7,031 km2 Hundested.jpg 3rd largest island in Icons-flag-dk.png Denmark, hosting the capital Copenhagen. Only Disko and Icons-flag-gl.png Greenland are larger.
Thebe Moon of Jupiter 116 x 98 x 84 kilometers Thebe.jpg
Portia Moons of Uranus 132,2 kilometers S2003U1 zoom.png
Despina 150 kilometers Simulated view of Despina.jpg
Puck 162 kilometers Puck with craters.jpg
Amalthea Moon of Jupiter 166,90 kilometers Amalthea (moon).png
Himalia 170 kilometers Cassini-Huygens Image of Himalia.png
Janus Moon of Saturn 179 kilometers PIA10447 Janus.jpg
Hyperion 270 kilometers[30] Hyperion false color.jpg
Mimas 396,4 kilometers[31] Mimas Cassini.jpg
Proteus Moon of Neptune 420 kilometers[32] Proteus map (Stooke).jpg
Vltava River 430 kilometers Vltava river in Prague.jpg Longest river in Czechia, an asteroid is named after it (see above). It drains into the Elbe river (see below).
Miranda Moon of Uranus 472 kilometers Miranda - January 24 1986 (30906319004).jpg
Enceladus Moon of Saturn 504,2 kilometers[33][34] Enceladus north.jpg
4 Vesta Asteroid 528 kilometers Vesta-HST.jpg
50000 Quaoar Trans-Neptunian object 890 kilometers Quaoar-transparent.png
1 Ceres Asteroid/Dwarf Planet 946 kilometers[35] Ceres optimized.jpg Largest asteroid for a time, then classified as a dwarf planet.
Elbe River 1,094 kilometers Elbe in Saxon Switzerland.jpg River in Czechia and Icons-flag-de.png Germany.
Ariel Moon of Uranus 1,128 kilometers Ariel - surface features.jpg
AR Scorpii White dwarf/neutron star 1,200 Artist’s impression of the exotic binary star system AR Scorpii.jpg
Charon Moon of Pluto 1,212 km[36][37] Charon.png
Icons-flag-uk.png United Kingdom Monarchy ~1,400 km (from northern Icons-flag-gb-sct.png Scotland to Devon) Great Britain Snowy.jpg
Haumea Dwarf Planet 1,632 km (mean)[38] Haumea, Celestia.jpg
Eris 2,326 km Artist's impression dwarf planet Eris.jpg
Pluto 2,376 km Pluto-01 Stern 03 Pluto Color TXT.jpg
Europa Moon of Jupiter 3,122 km PIA19048 realistic color Europa mosaic edited.jpg
The Moon Moon of Earth 3,474.2 km Full Moon Luc Viatour.jpg
Io Moon of Jupiter 3,821 km Io, moon of Jupiter, NASA.jpg
Callisto 4,820 km Callisto, moon of Jupiter, NASA.jpg
Mercury Terrestrial Planet 4,879 km Mercury in color - Prockter07 centered.jpg
Titan Moon of Saturn 5,150 km Layers of titan.jpg
Ganymede Moon of Jupiter 5,262 km Ganymede g1 true 2.jpg Largest moon in the solar system.
Mars Terrestrial Planet 6,779 km OSIRIS Mars true color.jpg
Icons-flag-ca.png Canada Constitutional Monarchy 9,306 km Toronto Campus August 2017.jpg Largest country in terms of total area in the Western Hemisphere.
Brobdingnag Fictional location 9,656 km (= 6,000 miles)[39] Brobdingnag map.jpg Fictional location in Jonathan Swift's novel Gulliver's Travels.
TRAPPIST-1 h Exoplanet 9,900 km[40] PIA21425 - TRAPPIST-1 Statistics Table.jpg
TRAPPIST-1 d 9,989 km[40]
TRAPPIST-1 e 11,595 km[40]
Venus Terrestrial Planet 12,103 km Venus globe.jpg
Earth 12,742 km The Earth seen from Apollo 17.jpg
TRAPPIST-1 f Exoplanet 13,328 km[40] PIA21425 - TRAPPIST-1 Statistics Table.jpg
TRAPPIST-1 c 13,592 km[40]
TRAPPIST-1 b 14,283 km[40]
TRAPPIST-1 g 14,627 km[40]
Kapteyn b Exoplanet 20,387.2 km KapteynB.jpg
Kepler-22 b 25,993,68 km[41] Kepler22b-artwork.jpg
Planet Nine Ice Giant 43,200 km Planet Nine comparison.jpg
Neptune 49,244 km Neptune Full.jpg
Uranus 50,724 km Uranus thumb.jpg
Saturn Gas Giant 116,464 km Saturn during Equinox.jpg
EBLM J0555-57Ab Red Dwarf 118,000 km[42] RedDwarfNASA-hue-shifted.jpg This is the smallest known star, as of 2018.
2MASS J0523-1403 120,000 km[43][44]
SSSPM J0829-1309 122,600 km[44]
Jupiter Gas Giant 139,822 km Portrait of Jupiter from Cassini.jpg
TRAPPIST-1 Red Dwarf 158,800[45] km PIA21429 - Transit Illustration of TRAPPIST-1 (cropped).jpg Hosts 3 potentially Earth-like planets. All 7 planets orbiting this star are listed above for comparison.
OGLE-TR-122B 162,220[46] km 1e8m comparison Saturn Jupiter OGLE-TR-122b with Uranus Neptune Sirius B Earth Venus no transparency.png
Luyten 726-8 (A and B) 190,000[47] km Nearby Stars (14ly Radius).svg
Proxima Centauri 202,000[48] km Proxima Centauri 2MASS Atlas.jpg The closest star to the Sun.
Wolf 359 222,800[49] km Nearby Stars (14ly Radius).svg
Ross 248 222,800[50] km
Barnard's Star 272,000[48] km
CM Draconis B 334,000 [51] km
Ross 154 337,000[52] km
CM Draconis A 352,000[51] km
Kapteyn's Star 406,000 [48] km The closest Halo star to the Sun.[53]
Luyten's Star 487,000[54] km
Lalande 21185 547,000[55] km
Lacaille 9352 640,000[56] km
Tau Ceti Yellow Dwarf 1,104,000 km[57] Compare sun tau ceti.png
Sun 1,392,784 km The Sun by the Atmospheric Imaging Assembly of NASA's Solar Dynamics Observatory - 20100819.jpg
Chara 1,564,000 km[58] Yellow dwarf.jpg
Alpha Centauri
  • 1,708,000 km (A)
  • 1,204,000 km (B)


Alpha Centauri relative sizes.svg
Sirius A White Dwarf 2,383,000 km Sirius A-Sun comparison2.png Brightest star in the night sky.
Denebola 2,406,067.2 km[60] Sirius-0.JPG
Altair 2,548,092 km[61] Altair PR image6 (white).jpgAltair PR image6 (orange).jpg Owing to its rapid rotation, Altair's radius is larger at its equator than at its poles at 2.03 solar radii; it is also cooler at the equator than at the poles which are 1.63 solar radii apart.
Vega 3,928,000 km Vega - star in Lyra.png
Regulus Blue Main Sequence Star 4,306,000 km[62] Regulus1.jpg
Delta Cygni "Rukh" A ("Fawaris") 7,143,012 km BlueHyper.jpg
Spica 10,306,000 km Finding spica.png
Pollux Orange Giant 11,140,000 km Pollux-Sun comparison.png
Capella A Yellow Giant 16,680,952 km Capella B Aladin.jpgCapella spectrum average.png
Alnitak Blue Main-Sequence Star 27,848,000 km Alnitak sun comparison.svg The brightest O-type star in the night sky; it is a member of Orion's belt.
Sagittarius A* Supermassive black hole 44,000,000 km Black Hole in the universe.jpg Localed at the center of Milky Way
For a size comparison between several notable and large stars, see the list of largest stars
Quasi star Hypothetical Star 45,200,000,000 km Quasi-star size comparison.png Hypothetical type of star powered not by nuclear fusion, but rather a black hole at its core.
TON 618 Central Black Hole Ultramassive black hole 390,600,000,000 km Razmer-chernoj-dyry.jpg Located in an extremely luminous quasar.
Stingray Nebula Nebula ~757,600,000,000 km Stingraynebula (cropped).jpg
SDSS J140821.67+025733.2 Central Black Hole Ultramassive black hole 1,159,900,000,000 km Artist's impression of the surroundings of the supermassive black hole in NGC 3783.jpg Among the largest and most massive known black holes.
Cat's Eye Nebula Nebula ~1,894,000,000,000 km Cat's Eye Nebula.jpg
NGC 6826 «Blinking Planetary» 2,083,400,000,000 km NGC 6826 "Blinking Eye".jpg
Light year (9,470,000,000,000 kilometers)
Dumbbell Nebula Nebula 1.44 light years M27 - Dumbbell Nebula.jpg
Oort Cloud Region of Comets 2 light years Kuiper belt - Oort cloud numbered.svg Defines the outermost edge of the Solar System.
Crab Nebula Nebula 10 light years Crab Nebula.jpg Also known as Messier 1.
Pillars of Creation 11 light years Pillars of Creation.jpeg
Great Orion Nebula 24 light years The Great Orion Nebula (M42).jpg
Dark star Hypothetical Star 32 light years[63] NGC 1579 The Trifid of the North.jpg Dark stars are stars that could have existed in the early universe. They do not perform nuclear fusion, but rather they emitted energy as hydrogen and helium reacted annihilation reactions with dark matter within them. Under this model, they would be nothing but large clouds of hydrogen and helium that emits such small amounts of radiation that they would be invisible to the naked eye; they would have diameters ranging from 559,000,000 to 300,000,000,000,000 kilometers.
Pleiades Star Cluster 44 light years Pleiades medium Amba Nagri.jpg
Lagoon Nebula Nebula 110 light years
Great Rift Galaxy Arm 300 light years
Carina Nebula Nebula 460 light years It contains the Eta Carinae star system within the Homonculus Nebula.
NGC 604 Nebula 1,520 light years Largest known H II region.
Small Magellanic Cloud Galaxy 7,000 light years
Sagittarius Dwarf Galaxy 8,000 light years
Large Magellanic Cloud 14,000 light years Nearest galaxy to the Milky Way.
Whirlpool Galaxy 60,000 light years[64]
Triangulum Galaxy 70,000 light years Farthest object visible to the naked eye.
Black Eye Galaxy 85,000 light years
Cartwheel Galaxy 150,000 light years
Pinwheel Galaxy 175,000 light years Pinwheel Galaxy SST.tif
NGC 1232 200,000 light years Galaxy NGC 1232.jpg
Milky Way 200,000 light years[65] ESO - Milky Way.jpg Once thought to be smaller at between 100,000 and 120,000 ly. More recent studies using a large survey of stars instead of just models found that the galaxy is much larger than previously believed and slightly smaller than the Andromeda Galaxy (see below).
Andromeda Galaxy 220,000 light years Andromeda Galaxy (with h-alpha).jpg
Virgo A 250,000 light years The halo of galaxy Messier 87.jpg
Comet Galaxy 600,000 light years CometGalaxy.jpg
Malin 1 650,000 light years MALIN 1 (post-processed).jpg The largest barred spiral galaxy known.
UGC 2885 832,000 light years UGC 2885.png The largest spiral galaxy known.
cD Galaxy[citation needed] NGC 4889 1,300,000 light years NGC 4889.jpg
IC 1101 5,000,000 light years IC 1101.jpg The largest singular object in the entire universe. This galaxy contains about 400,000,000,000 stars.
Local Group Galaxy Cluster 10,000,000 light years[66] Local Group and nearest galaxies.jpg
Virgo Cluster 30,000,000 light years This cluster contains approximately 1,500 galaxies.[67]
Laniakea Supercluster 520,000,000 light years
Hercules-Corona Borealis Great Wall 2,000,000,000 light years The largest structure/galaxy cluster in the entire universe.
Observable Universe Region of the entire Universe 93,000,000,000 light years 8 Observable Universe (ELitU)-blank.png


  1. ISBN 3527405038
  2. ISBN 3527405038
  3. ISBN 0443016577
  6. GT describes them to be "as tall as a church steeple". This has been widely interpreted as around 22 meters.
  10. The elevation given here was determined by the 1971–73 Australian Universities' Expedition and is supported by the Seven Summits authorities and modern high resolution radar data. An older but still often quoted elevation of 5,030 metres (16,503 ft) is obsolete.
  29. Britt et al. 2002, p. 486
  39. As described in the book.
  40. 40.0 40.1 40.2 40.3 40.4 40.5 40.6
  42. , , and bibcode= 2017arXiv170608781V
  44. 44.0 44.1 doi= 10.1088/0004-6256/147/5/94
  46. and and doi= 10.1051/0004-6361:200500025
  47. bibcode=2000A&A...364..217D}}
  48. 48.0 48.1 48.2 B.-O. Demory; D. Segransan; T. Forveille; D. Queloz; J.-L. Beuzit; X. Delfosse; E. Di Folco; P. Kervella et al. (2 June 2009). "Mass-radius relation of low and very low-mass stars revisited with the VLTI". Astronomy and Astrophysics 505 (1): 205–215. arXiv:0906.0602. Bibcode 2009A&A...505..205D. doi:10.1051/0004-6361/200911976.
  49. Doyle, J. G. et al. (1990). "Optical and infrared photometry of dwarf M and K stars". Astronomy and Astrophysics 235 (1-2): 335–339. Bibcode 1990A&A...235..335D.
  50. Johnson, H. M.; Wright, C. D. (November 1983). "Predicted infrared brightness of stars within 25 parsecs of the Sun". Astrophysical Journal Supplement Series 53: 643–711, 705. Bibcode 1983ApJS...53..643J. doi:10.1086/190905.
  51. 51.0 51.1 J.C. Morales; I. Ribas; C. Jordi; G. Torres; J. Gallardo; E.F. Guinan; D. Charbonneau; M. Wolf et al. "Absolute properties of the low-mass eclipsing binary CM Draconis". The Astrophysical Journal 691 (2): 1400–1411. arXiv:0810.1541. Bibcode 2009ApJ...691.1400M. doi:10.1088/0004-637X/691/2/1400.
  52. Johnson, H. M.; Wright, C. D. (1983), "Predicted infrared brightness of stars within 25 parsecs of the sun", Astrophysical Journal Supplement Series 53: 643–711, Bibcode 1983ApJS...53..643J, doi:10.1086/190905—see p. 693.
  54. doi=10.1086/340570
  55. Demory, B.-O. et al. (October 2009), "Mass-radius relation of low and very low-mass stars revisited with the VLTI", Astronomy and Astrophysics 505 (1): 205–215, arXiv:0906.0602, Bibcode 2009A&A...505..205D, doi:10.1051/0004-6361/200911976
  56. doi=10.1051/0004-6361/200911976
  59. (for both stars).

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