Deimos size and scale context

Deimos is the smaller, outer moon of Mars, only about 12 kilometers across. Its dusty regolith softens many of its craters, giving this dark asteroid-like moon a smoother face than its larger sibling Phobos. Read its scale context, comparisons, and journey links on the canonical object page.

DimorphosRubble-pile asteroid·151 m

BennuCarbonaceous near-Earth asteroid·490 m

RyuguCarbonaceous near-Earth asteroid·900 m

67P/Churyumov–GerasimenkoComet nucleus·6 km

DeimosSmall irregular moon·12 km

Crab PulsarNeutron star·20 km

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Between the smallest and the largest, perspective is everything.

About

Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.

Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.

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Between the smallest and the largest, perspective is everything.

About

Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.

Guides turn parts of that scale into curated essays, while focused views let you explore the same range through specific groups of objects.

Editorial

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

Views

Planets of the Solar System Stars of the Universe Black holes Subatomic scale

Open Scale of Space Browse all comparisons

Comets

67P/Churyumov–Gerasimenko

67P/Churyumov–Gerasimenko is the comet nucleus studied in unrivaled detail by ESA’s Rosetta mission. Rosetta detected molecular oxygen streaming from the comet, a surprising result that suggests some of its ice preserves very early Solar System chemistry.

Scale fact6 kmmaximum extent

Object class: Comet nucleus
Mass: ~10 billion tonnes
Host: Solar System
Estimated age: ~4.5 billion years
Composition: Water ice, dust, frozen volatiles

Moons

Deimos

Scale fact12 kmmean diameter

Object class: Small irregular moon
Host: Mars
Composition: C-type asteroid-like material and regolith

Stellar remnants

Crab Pulsar

The Crab Pulsar is the neutron-star core left behind by the explosion that also created the Crab Nebula. It spins about 30 times each second, and its magnetic engine drives much of the nebula’s glow by pouring particles and radiation into the surrounding wreckage.

Scale fact20 kmdiameter

Object class: Neutron star
Mass: ~1.4 solar masses
Host: Crab Nebula
Estimated age: ~970 years
Composition: Neutron-degenerate matter