Bubble chamber and solar panel: what they have in common

1. Step 1. Bubble chamber — has part — Camera. Photographing the tracks.
2. Step 2. Camera — evolved into — Smartphone camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.
3. Step 3. Smartphone camera — is part of — Lunokhod. TV cameras.
4. Step 4. Lunokhod — has part — Solar panel. A solar panel.

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