Space debris and radar: what they have in common

1. Step 1. Space debris — uses — Orbital motion. They remain in orbit.
2. Step 2. Orbital motion — is used in — Artificial satellite. It moves in orbit.
3. Step 3. Artificial satellite — includes — Sputnik 1. The first satellite.
4. Step 4. Sputnik 1 — has part — Antenna. Four whip antennas.
5. Step 5. Antenna — is part of — Radar. An antenna emits and receives.

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