10⁻¹⁸ m: Quark size (~10⁻¹⁸ m)
10⁻¹⁵ m: Proton diameter (~1.7 fm), atomic nucleus
10⁻¹² m: Small atoms (~50-300 pm), X-ray wavelengths
10⁻¹⁰ m: Hydrogen atom diameter (~1 Å), chemical bond lengths
10⁻⁹ m: DNA width (~2 nm), transistor gates (~3-5 nm), viruses (~100 nm)
10⁻⁶ m: Bacteria (~1-10 μm), red blood cells (~7 μm), human hair width (~80 μm)
10⁻³ m: Grain of sand (~1 mm), ant (~2 mm), pencil tip
10⁻² m: Fingernail width (~1 cm), coin diameter (~2 cm)
10⁻¹ m: Width of a hand, smartphone length
10⁰ m: Guitar length, door width, half a human height
10¹ m: Bowling lane (18m), blue whale (30m)
10² m: Football field (100m), Statue of Liberty height (93m)
10³ m: Golden Gate Bridge (2.7 km), depth of deepest ocean
10⁴ m: Manhattan island length (~20 km), Mount Everest height (8.8 km)
10⁵ m: Edge of space (Kármán line, 100 km)
10⁶ m: Earth radius (~6,371 km), Moon diameter (~3,474 km)
10⁷ m: Earth diameter (~12,742 km)
10⁸ m: Earth-Moon distance (~384,400 km), Jupiter diameter
10⁹ m: Sun diameter (~1.4 Gm), light travels in ~3.3 seconds
10¹¹ m: Earth-Sun distance (~150 Gm = 1 AU)
10¹² m: Solar system inner planets orbit distances
10¹³ m: Solar system (to Saturn ~1.4 × 10¹² m)
10¹⁶ m: 1 light-year ≈ 9.46 × 10¹⁵ m, nearest star Proxima Centauri (~4.2 ly)
10²¹ m: Milky Way diameter (~100,000 light-years)
10²⁶ m: Observable universe diameter (~8.8 × 10²⁶ m)