486958 Arrokoth size and scale context

Arrokoth is a cold classical Kuiper belt object and the most distant world ever explored up close. New Horizons flew past it in 2019 and found a contact binary of two lobes gently joined together. Read its scale context, comparisons, and journey links on the canonical object page.

433 ErosS-type near-Earth asteroid·34 km

486958 ArrokothCold classical Kuiper belt object (contact binary)·34.5 km

PanShepherd moon·34.6 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

Asteroids

433 Eros

Eros is an elongated near-Earth asteroid explored by NASA’s NEAR Shoemaker mission. NEAR became the first spacecraft to orbit an asteroid and then survive a touchdown on one, turning Eros into a milestone in asteroid exploration.

Scale fact34 kmmaximum extent

Object class: S-type near-Earth asteroid
Mass: ~6.7 trillion tonnes
Estimated age: ~4.5 billion years
Composition: Silicate rock with metal

Asteroids

486958 Arrokoth

Arrokoth is a cold classical Kuiper belt object and the most distant world ever explored up close. New Horizons flew past it in 2019 and found a contact binary of two lobes gently joined together.

Scale fact34.5 kmmaximum extent

Object class: Cold classical Kuiper belt object (contact binary)
Composition: Water ice and tholin-rich organics
Mass: ~7.5 × 10¹⁴ kg

Moons

Pan

Pan is Saturn's innermost named moon, orbiting inside the Encke Gap in the A ring. Its gravity helps keep the gap open, while ring particles swept onto its equator have built a broad ridge around its irregular body.

Scale fact34.6 kmmaximum extent

Object class: Shepherd moon
Host: Saturn
Mass: ~4.3 trillion tonnes
Temperature: ~78 K