Some high orbiting settlers began having formed from usable asteroids some telescopes, to be ion jetted to the nearby stars. Each exploring telescope at some star would study all planets and major asteroids orbiting its star. It would compute and report such orbits to us back here, together with images collected of the planets. Planet sizes and surface appearances would be sent back here with observed orbit details. Observing orbiting moons would let their parent planet masses be determined.
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