Scale Explorer
From Atoms to the Universe
Scroll to explore the incredible range of scales in our universe. Every object is placed on a logarithmic scale.
Planck Length
1.6×10⁻³⁵ mAbout 1.6×10⁻³⁵ m — the smallest length that has physical meaning. Below this, known physics breaks down.
Proton
0.8 fmAbout 0.84 fm in radius. One of the particles that make up the atomic nucleus.
Atomic Nucleus
1.0 fmThe dense center of an atom, made of protons and neutrons. About 1 femtometer across.
Hydrogen Atom
100.0 pmThe smallest and most abundant element in the universe. About 1 Ångström across.
DNA Width
2.0 nmThe double helix is about 2 nm wide. The blueprint of life.
Red Blood Cell
8.0 µmAbout 8 µm across. You have about 25 trillion. They carry oxygen.
Hair Width
70.0 µmAbout 70 µm thick. About 9 red blood cells side by side.
Ant
2.0 mmAbout 2 mm long. Over 22,000 species worldwide. Can carry 50x their body weight.
Pencil
19.0 cmAbout 19 cm long. The average pencil can draw a line 56 km long.
Human
1.7 mAverage height about 1.7 m. About 8 billion on Earth.
Tokyo Skytree
634.0 m634 m tall. The tallest tower in the world (as of 2024).
Mount Fuji
3.8 km3,776 m tall. Japan's highest peak. About 300,000 climbers per year.
Mount Everest
8.8 km8,849 m tall. Earth's highest peak. Air pressure is about 1/3 of sea level.
Japan Archipelago
3.0 MmAbout 3,000 km long. From Hokkaido to Okinawa.
Earth's Diameter
12.7 MmAbout 12,742 km. Light travels around Earth in about 0.13 seconds.
Earth-Moon Distance
384.4 MmAbout 384,400 km. Light takes 1.3 seconds. Reached by Apollo missions.
Sun's Diameter
1.4 GmAbout 1.39 million km. About 109 Earths across. Surface temperature: ~5,500°C.
Solar System
9.0 TmAbout 9 billion km across. Light takes ~8.3 hours from edge to edge.
Nearest Star (Proxima Centauri)
40.0 PmAbout 4.24 light-years away. Would take ~73,000 years with current technology.
Milky Way Galaxy
950.0 EmAbout 100,000 light-years across. Contains 100-400 billion stars.
Observable Universe
880.0 YmAbout 93 billion light-years across. Contains ~2 trillion galaxies. The limit of what we can see.
You've reached the edge of the observable universe.
From 1 femtometer to 880 billion trillion meters. That's the range of scales in our universe.
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