Radioactivity and rocket: what they have in common

1. Step 1. Radioactivity — is used in — Radioisotope generator. The decay heat of plutonium.
2. Step 2. Radioisotope generator — is part of — Space probe. The Voyagers’ RTGs.
3. Step 3. Space probe — uses — Multistage rocket. Launch.
4. Step 4. Multistage rocket — is a kind of — Rocket. A multistage rocket is a rocket that drops its empty tanks on the way.

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