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How to explore Habitable Zone 3D Explorer

Last reviewed: 2026-07-17

Reviewed by FreetoolOnline editorial team

Open the Habitable Zone 3D Explorer, pick Sun M dwarf or TRAPPIST-1-class, and watch the green habitable-zone band rescale as sqrt(L).

Open https://freetoolonline.com/space-3d/habitable-zone.html and wait for the star plus green HZ annulus to paint.
Leave Sun (L=1) selected - read conservative HZ 0.95-1.37 AU and Earth at 1 AU in the facts panel.
Click Venus (~0.72 AU) or Mars (~1.52 AU) to see inside vs near-outer-edge status.
Switch to M dwarf (L=0.1) - HZ moves to ~0.30-0.43 AU; TRAPPIST-1-class shows ~0.022-0.032 AU.
Press Pause orbits to freeze markers, then HZ table for all three presets at once.

See four steps in the Habitable Zone walkthrough: open the scene, read the Sun HZ band, compare Venus or Mars, then switch to an M dwarf. — Open, read Sun HZ, compare planets, switch M dwarf.

Habitable zone key figures

Star / body	Habitable zone or distance (AU)
Sun (L=1) conservative HZ	0.95-1.37 AU
Earth	1 AU
Venus	~0.72 AU
Mars	~1.52 AU
M dwarf (L=0.1) HZ	~0.30-0.43 AU
TRAPPIST-1-class HZ	~0.022-0.032 AU

Next: the when guide or vs alternatives. Open the Habitable Zone 3D Explorer.

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Last updated: Jul 17, 2026

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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