Star tracker and dewar flask: what they have in common

1. Step 1. Star tracker — works like — Sextant. Navigating by the stars — as sailors did.
2. Step 2. Sextant — has part — Mirror. Mirrors — the principle of double reflection.
3. Step 3. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
4. Step 4. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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