Physical Size

A scroll-driven journey through the scale of the universe, from subatomic structures to the largest known cosmic systems.

Explore objects to scale

Fundamental String size and scale context
Electron size and scale context
Proton size and scale context
Neutron size and scale context
Plutonium-244 Nucleus size and scale context
Hydrogen Atom size and scale context
Water Molecule size and scale context
Cesium Atom size and scale context
Coronene size and scale context
Nanodiamond size and scale context
Carbonaceous Grain size and scale context
Dust Aggregate size and scale context
Presolar SiC Grain size and scale context
Micrometeorite size and scale context
Chondrule size and scale context
Carbonaceous Chondrite size and scale context
Ordinary Chondrite size and scale context
Nakhla Meteoroid size and scale context
Hoba Meteoroid size and scale context
Chelyabinsk Meteoroid size and scale context
Tunguska Meteoroid size and scale context
Dimorphos size and scale context
25143 Itokawa size and scale context
101955 Bennu size and scale context
65803 Didymos size and scale context
152830 Dinkinesh size and scale context
162173 Ryugu size and scale context
Methone size and scale context
4179 Toutatis size and scale context
81P/Wild (Wild 2) size and scale context
67P/Churyumov–Gerasimenko size and scale context
9P/Tempel 1 size and scale context
19P/Borrelly size and scale context
52246 Donaldjohanson size and scale context
Halley's Comet size and scale context
Deimos size and scale context
951 Gaspra size and scale context
Crab Pulsar size and scale context
Phobos size and scale context
Calypso size and scale context
Telesto size and scale context
433 Eros size and scale context
486958 Arrokoth size and scale context
Pan size and scale context
Atlas size and scale context
Helene size and scale context
243 Ida size and scale context
253 Mathilde size and scale context
Pandora size and scale context
Cygnus X-1 size and scale context
21 Lutetia size and scale context
Epimetheus size and scale context
Prometheus size and scale context
Puck size and scale context
Janus size and scale context
Phoebe size and scale context
Nereid size and scale context
Hyperion size and scale context
Mimas size and scale context
Proteus size and scale context
Miranda size and scale context
Enceladus size and scale context
4 Vesta size and scale context
Ceres size and scale context
Tethys size and scale context
Dione size and scale context
Ariel size and scale context
Umbriel size and scale context
Charon size and scale context
Makemake size and scale context
Iapetus size and scale context
Oberon size and scale context
Rhea size and scale context
Titania size and scale context
Haumea size and scale context
Eris size and scale context
Pluto size and scale context
Triton size and scale context
Europa size and scale context
Moon size and scale context
Io size and scale context
Callisto size and scale context
Mercury size and scale context
Titan size and scale context
Ganymede size and scale context
Mars size and scale context
Venus size and scale context
Earth size and scale context
Neptune size and scale context
Uranus size and scale context
NGC 4395 Black Hole size and scale context
Saturn size and scale context
Jupiter size and scale context
Luhman 16 B size and scale context
Proxima Centauri size and scale context
Lalande 21185 size and scale context
61 Cygni A size and scale context
Sun size and scale context
Procyon A size and scale context
Spica A size and scale context
Pollux size and scale context
Sagittarius A* size and scale context
Arcturus size and scale context
Aldebaran size and scale context
Rigel size and scale context
Eta Carinae A size and scale context
Betelgeuse size and scale context
VY Canis Majoris size and scale context
Stephenson 2-18 size and scale context
Solar System size and scale context
M87* size and scale context
Holm 15A* size and scale context
TON 618 size and scale context
Phoenix A* size and scale context
NGC 7027 size and scale context
Cat's Eye Nebula size and scale context
Homunculus Nebula size and scale context
Ring Nebula size and scale context
Helix Nebula size and scale context
Crab Nebula size and scale context
Orion Nebula size and scale context
Eagle Nebula size and scale context
Omega Centauri size and scale context
Carina Nebula size and scale context
Tarantula Nebula size and scale context
Sculptor Dwarf Galaxy size and scale context
Small Magellanic Cloud size and scale context
Large Magellanic Cloud size and scale context
Milky Way size and scale context
Andromeda Galaxy size and scale context
IC 1101 size and scale context
NGC 6872 size and scale context
Abell 1689 size and scale context
Pandora's Cluster size and scale context
Bullet Cluster size and scale context
Perseus Cluster size and scale context
Coma Cluster size and scale context
Virgo Supercluster size and scale context
Laniakea Supercluster size and scale context
Local Superclusters Region size and scale context
Expanded Local Superclusters Region size and scale context
Observable Universe size and scale context

Curated scale guides and comparisons

Browse all scale comparisons
Solar System Planets
From Electron to Atoms
Stars To Scale
Birth And Death Of Stars
Black Holes To Scale

hello@scaleofspace.org

103P/Hartley 2Comet nucleus·2.3 km

81P/Wild (Wild 2)Comet nucleus·5.5 km

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Scale

OF SPACE

Between the smallest and the largest, perspective is everything.

About

A scroll-based journey through the universe, placing objects on one logarithmic scale so size can be compared across an unbroken range.

Return to Earth Browse all comparisons

Scale

OF SPACE

Between the smallest and the largest, perspective is everything.

About

A scroll-based journey through the universe, placing objects on one logarithmic scale so size can be compared across an unbroken range.

Return to Earth Browse all comparisons

Comets

103P/Hartley 2

103P/Hartley 2 is the small, hyperactive comet that NASA's EPOXI mission flew past in 2010, revealing a peanut-shaped nucleus barely two kilometers long with jets of carbon-dioxide gas blasting chunks of ice into space.

Scale fact2.3 kmmaximum extent

Object class: Comet nucleus
Mass: ~300 million tonnes
Estimated age: ~4.5 billion years
Composition: Water ice, dust, frozen carbon dioxide

Visual creditEPOXI 2010 / NASA / JPL-Caltech / University of Maryland / Public domainSource: Wikimedia Commons

Comets

81P/Wild (Wild 2)

81P/Wild is the comet NASA's Stardust spacecraft flew through in 2004, catching grains of its coma in aerogel and returning them to Earth in 2006 — the first sample of cometary dust and the first solid material brought back from beyond the Moon.

Scale fact5.5 kmmaximum extent

Object class: Comet nucleus
Mass: ~23 billion tonnes
Estimated age: ~4.5 billion years
Composition: Water ice, dust, frozen volatiles

Visual creditStardust 2004 / NASA / Public domainSource: Wikimedia Commons

ScaleOfSpace.org Comets×

2.30km