Kuiper Belt size and scale context

The Kuiper Belt is a broad disc of icy bodies beyond Neptune, marking the outer realm of the Sun’s main planetary system. It contains dwarf planets such as Pluto and countless smaller frozen objects, preserving material from the early Solar System in a region shaped by Neptune’s gravity and orbital resonances. Read its scale context, comparisons, and journey links on the canonical object page.

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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

Return to Earth hello@scaleofspace.org

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

Return to Earth hello@scaleofspace.org

Planetary systems

Solar System

The Solar System’s main planetary span extends from the Sun out to Neptune’s orbit, not to its far larger comet reservoirs. Beyond the planets it continues through the Kuiper Belt and, much farther out, the Oort Cloud, so the familiar planetary layout is only the compact inner start of the Sun’s domain.

Scale fact9 billion kmorbital diameter

Object class: Planetary system
Host: Sun
Estimated age: ~4.6 billion years

Planetary systems

Kuiper Belt

Scale fact~16.5 billion kmextent

Object class: Circumstellar disc
Composition: Icy bodies, dwarf planets, comets, rock and frozen volatiles
Estimated age: ~4.6 billion years
Host: Sun

Black holes

M87*

M87* is the supermassive black hole at the center of Messier 87. The Event Horizon Telescope’s 2019 image of its glowing ring became the first direct image of a black hole’s immediate surroundings, turning a previously inferred boundary into a measurable true-scale object.

Scale fact~38 billion kmevent horizon diameter

Object class: Supermassive black hole
Host: Messier 87
Mass: ~6.5 billion solar masses