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How to Explore Dark Matter Rotation Curves 3D Explorer

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Open the Dark Matter Rotation Curves 3D Explorer, drag the radius slider across the disk, and toggle the dark-matter halo to see what each part of the scene represents.

  1. Open https://freetoolonline.com/space-3d/dark-matter-rotation-curves.html and wait for the disk of points to paint.
  2. Drag the radius slider to about 8 kpc - close to the Sun's own distance from the galactic center.
  3. Read the facts panel: the observed speed near 220-240 km/s against the visible-mass-only prediction at that radius.
  4. Drag the slider out to 20-25 kpc and watch the gap between the two curves widen.
  5. Click "Hide dark-matter halo (inferred)" to see the scene without the faint halo, then click again to bring it back.

Rotation-curve key figures

QuantityValue
Sun's distance from galactic center~8.1-8.2 kpc
Flat-curve speed~220-240 km/s
Visible-disk edge~10 kpc

Next: the when guide or vs alternatives. Open the Dark Matter Rotation Curves 3D Explorer.

Reviewed by the Free Tool Online editorial team · Tested in the current versions of Chrome, Firefox, Safari, and Edge before publishing. No account is needed to use any tool. Report a bug - we triage within 72 hours. · Last refreshed April 2026.

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