FOURTEEN ORDERS OF MAGNITUDE

From Planet to Cell

A 22-second animated descent from the whole Earth to a particle 100 nm across, in six stops. Each stop gets one real reference size, from the planet's 12,742 km diameter to a cell membrane a few nanometers thick. The frames are illustrations of scale, not microscope images.

3 min readUpdated 2026-11-04ReviewedAConsensusBWell supportedPProvenance

Four blended panels: NASA map of Africa and Europe, ocean whitecaps, a cell, an amber particle above a membrane; illustration — Illustration: four stops of the journey through scales, from the planet (about 12,742 km across) to a 100 nm particle, not to relative scale. Earth: NASA Blue Marble (2002), flat-map crop; ocean, cell and particle: AI illustrations, not photographs or microscope images.IllustrationEarth: NASA Goddard Space Flight Center. Image by Reto Stöckli (land surface, shallow water, clouds). Enhancements by Robert Simmon (ocean color, compositing, 3D globes, animation). Ocean, cell and particle: Site illustration (AI-generated, OpenAI image model via Codex). Composite: Nanoplastics Observatory.NASA (Earth frame); Site original (illustrations and composition)

The route: one planet, six stops, 22 seconds

"From planet to cell" opens from the rotating Earth on the home page and runs for just under 22 seconds at normal speed. It stops six times: the planet, the atmosphere, the water just below the surface, a millimeter of seawater, a cell and one particle 100 nm across. The journey can be paused, scrubbed or jumped stop by stop.

The scale bar falls from 10,000 km to 100 nm, a span of 14 orders of magnitude (level P; our calculation: ten million meters to one ten-millionth of a meter). The last particle is smaller than the shortest wavelength the human eye detects, 380 nm¹. A conventional light microscope cannot resolve its shape, because Abbe's limit for such instruments is about 0.2 µm².

orders of magnitude from the first to the last stop

journey scale bar, 10,000 km to 100 nm (10⁷ m to 10⁻⁷ m); our calculation³

P: arithmetic on the fixed chapter scales, not a scientific finding; Earth's 12,742 km diameter gives the same order

PProvenance

≈12,742 km

Earth's mean diameter

twice NASA's volumetric mean radius of 6,371 km (doubling is our calculation)³

A: official NASA planetary reference value

AConsensus

≈0.2 µm

resolution limit of a conventional light microscope

Abbe's diffraction limit, about half the wavelength of light; super-resolution fluorescence methods bypass it for labeled molecules²

A: textbook optics, stated by the Nobel committee; a smaller particle can still show up as a blur, but its shape is not resolved

AConsensus

The scale ladder from 10,000 km to 100 nm

Each stop is a power of ten. One real object anchors each one, and the factor to the next stop shows how far the camera moves.

10,000 km, planet. Earth's mean diameter is about 12,742 km, twice NASA's mean radius of 6,371 km³. Next stop: 10,000 times closer.
1 km, atmosphere. Low clouds, the kind the camera passes through here, have their bases between the surface and about 2 km in the mid-latitudes (level B)⁴. Next: 1,000 times closer.
1 m, water. The 1 m on the scale bar describes the frame, not a depth: the camera is just below the surface. Little sunlight reaches below 200 m, the lower edge NOAA gives for the sunlit (euphotic) zone⁵, and the ocean averages 3,682 m deep⁶. Next: 1,000 times.
1 mm, microworld. An average human hair is about 70 µm thick⁷; about 14 would fit side by side across 1 mm (level P; our calculation). Next: 100 times.
10 µm, cell. A human red blood cell is 7–8 µm across⁸; a typical cloud droplet is about 20 µm (level B)⁹. An E. coli bacterium, about 1 µm wide and 2 µm long⁸, sits between this stop and the next. Next: 100 times.
100 nm, nanoparticle. Visible light spans 380–700 nm¹. A cell membrane's lipid bilayer is about 4 nm thick, and the whole membrane with its proteins is reported at 4–10 nm⁸. A 100 nm particle is therefore 10 to 25 times thicker than the membrane beside it (level P; our calculation).

From planet to cell: six stops and reference sizes on one logarithmic ruler

A logarithmic ruler from 10,000 km to 4 nm with the journey's six stops (editorial, fixed by the journey code) and reference objects: Earth, ocean depth, low clouds, sunlit zone, hair, cloud droplet, red blood cell, bacterium, visible light, the light-microscope limit and the cell membrane. Source:³^,⁶^,⁵^,⁷^,⁸^,⁹^,¹^,²^,⁴ Site original (this site's own record)Nanoplastics ObservatorySite original

Data table

label	value	unit	kind	source	note
Stop 1 · Planet (journey scale)	10000000	m	stop	site-original	editorial stop fixed by the journey code
Earth, mean diameter	12742000	m	reference	S-300
Ocean, average depth	3682	m	reference	S-301
Low clouds, base up to about 2 km	2000	m	reference	S-306	mid-latitudes; draw as a band from the surface to 2.0e3
Stop 2 · Atmosphere (journey scale)	1000	m	stop	site-original	editorial stop fixed by the journey code
Sunlit (euphotic) zone, lower edge	200	m	reference	S-302
Stop 3 · Water (journey scale)	1	m	stop	site-original	editorial stop fixed by the journey code
Stop 4 · Microworld (journey scale)	0.001	m	stop	site-original	editorial stop fixed by the journey code
Human hair, average diameter	0.00007	m	reference	S-231
Cloud droplet, typical diameter	0.00002	m	reference	S-303
Stop 5 · Cell (journey scale)	0.00001	m	stop	site-original	editorial stop fixed by the journey code
Red blood cell, diameter 7–8 µm	0.0000075	m	reference	S-222
E. coli, length	0.000002	m	reference	S-222
Visible light, 380–700 nm	5.4e-7	m	reference	S-304	draw as a band from 3.8e-7 to 7.0e-7
Light microscope limit (Abbe)	2e-7	m	reference	S-305
Stop 6 · Nanoparticle (journey scale)	1e-7	m	stop	site-original	editorial stop fixed by the journey code
Cell membrane, 4–10 nm	4e-9	m	reference	S-222	draw as a band from 4e-9 to 1.0e-8

What the journey is not

The opening Earth is the NASA Blue Marble globe; the ocean, cell and particle frames are AI illustrations, not photographs or microscope images. The camera path is one continuous illustrative move; no single particle was tracked from sea to cell.

The final frame is not drawn to scale: a real 100 nm particle would be 10 to 25 times thicker than the membrane, not a few times. Nor is it evidence that particles enter cells; what is known about uptake is on Human Body. Size classes are on What Is Nanoplastic, detection on How We Measure It, the panels on Four Microworlds.

Illustration of a dark navy ocean seen straight down between two banks of white cumulus, cloud edges lit gold at upper left — Illustration: the descent at the 1 km atmosphere stop, looking straight down through a wide gap in a cumulus deck onto the dark ocean. Illustrative scale; AI visualization, not an aerial photograph.Illustration · AI generatedMade with FLUX.1-schnell (fp8, Comfy-Org/Flux-1-Schnell) · ComfyUI (local), tools/content/generate_l3.pySite illustration (AI-generated, FLUX.1 schnell)Site original

Illustration of a dark blue ocean surface with white wave crests, framed by white clouds at the corners — Illustration: open ocean seen from above through gaps in the clouds, as the journey descends from the 1 km atmosphere stop toward the sea. Illustrative scale; AI visualization, not an aerial photograph.Illustration · AI generatedMade with OpenAI gpt-image (version not stated), via Codex Desktop, 14 October 2026 · Codex Desktop (OpenAI)Site illustration (AI-generated, OpenAI image model via Codex)Site original

Illustration of a glowing amber plastic flake floating among tiny pale specks in turquoise water lit from above — Illustration: an amber plastic fragment among smaller particles in sunlit seawater at the journey's 1 mm stop. Sizes approximate and illustrative; not a micrograph, and no organism is shown.Illustration · AI generatedMade with FLUX.1-schnell (fp8, Comfy-Org/Flux-1-Schnell) · ComfyUI (local), tools/content/generate_l3.pySite illustration (AI-generated, FLUX.1 schnell)Site original

Illustration of an amber, glassy particle hovering above a membrane of pearl-like lipid heads with blue proteins — Illustration: an amber particle above a cell membrane, the final 100 nm stop. Not to scale (a real 100 nm particle is 10–25 times the membrane's thickness) and not evidence of cell entry.Illustration · AI generatedMade with OpenAI gpt-image (version not stated), via Codex Desktop, 14 October 2026 · Codex Desktop (OpenAI)Site illustration (AI-generated, OpenAI image model via Codex)Site original

Sources

NASA Science (2023). Visible Light. NASA. science.nasa.gov/ems/09_visiblelight/ web open access
The Royal Swedish Academy of Sciences (2014). The Nobel Prize in Chemistry 2014: popular information (How the optical microscope became a nanoscope). Nobel Prize Outreach / The Royal Swedish Academy of Sciences. www.nobelprize.org/prizes/chemistry/2014/popular-information/ press open access
Williams DR (2024). Earth Fact Sheet. NASA Goddard Space Flight Center, NSSDCA. nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html dataset open access
UCAR Center for Science Education (2026). Cloud Types. University Corporation for Atmospheric Research (UCAR). scied.ucar.edu/learning-zone/clouds/cloud-types web open access
NOAA National Ocean Service (2026). How far does light travel in the ocean?. National Oceanic and Atmospheric Administration (NOAA). oceanservice.noaa.gov/facts/light_travel.html web open access
NOAA National Ocean Service (2026). How deep is the ocean?. National Oceanic and Atmospheric Administration (NOAA). oceanservice.noaa.gov/facts/oceandepth.html web open access
US Environmental Protection Agency (2026). Particulate Matter (PM) Basics. US EPA, last updated 18 September 2026. www.epa.gov/pm-pollution/particulate-matter-pm-basics web open access
Milo R, Phillips R (2015). Cell Biology by the Numbers. Garland Science. doi:10.1201/9780429258770 report open access
Russell R (2007). Sizes of Aerosols, Raindrop and Cloud Droplets. UCAR Center for Science Education. scied.ucar.edu/image/aerosols-raindrop-cloud-droplets-sizes web open access

Evidence levels and provenance

AConsensusUsed on this page: Multiple independent studies or a systematic review plus a statement by a scientific body.
BWell supportedUsed on this page: Several independent studies with concordant findings.
CLimited: Few studies, narrow conditions, or methodological caveats.
DDisputed: Conflicting results; both sides are shown.
EUnknown: No reliable evidence found; the search scope is stated.

PProvenanceUsed on this page: Provenance: checked against the primary record. A separate category, not an evidence grade: used for bibliographic facts, legal texts, official metadata, definitions quoted from a standard, the site's own arithmetic and statements about the site's process.

Editorial categories of this site. A–E grade scientific findings, per claim, with a one-line rationale; D and E are not lower rungs of the A–C scale. P is not a grade: it marks facts checked against their primary record.