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How to explore Einstein Ring 3D Explorer
Open the explorer and watch a background source bend into a ring, then arcs, as its alignment with the lens drifts.
- Open https://freetoolonline.com/space-3d/einstein-ring.html and wait for the scene.
- Watch the blue source drift behind the lens galaxy; when it is centred, its image is a full ring.
- As it drifts off-centre, watch the ring concentrate into two bright arcs.
- Read the facts panel: the Einstein radius, the 1.75 arcsec Sun deflection, and Eddington 1919.
- Pause the drift or hide the light rays.
Einstein ring key figures
| Quantity | Value |
|---|---|
| Einstein radius | theta_E = sqrt(4GM/c^2 x D_LS/(D_L D_S)) |
| Sun's grazing-light deflection | 1.75 arcsec (Eddington, 1919) |
| First Einstein ring | MG1131+0456 (1988) |
Next: the when guide or vs alternatives. Open the Einstein Ring 3D Explorer.
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