Move Over, Moon! Meet Earth's Flock of Quasi-Moons
Briefly

How many moons does Earth have? And to be clear, I mean natural satellites, not human-made ones. [...] if you change your frame of reference and squint a little bit, the answer is more like seven.
Orbital mechanics is a weird subject. If you have a single objectsay, a planetorbiting another single objecta starthen things are relatively simple. [...] And it also happens to be near the planet in space, too, as they o
Read at www.scientificamerican.com
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