The Solar System’s outer limits
Jun 10, 2021
2 minutes
Words by Andrew May
For 60 years after its discovery in 1930, Pluto – together with its largest moon Charon, discovered in 1978 – marked the outermost limit of the Solar System. With an average distance from the Sun of 39 astronomical units (AU) – with one AU the distance from Earth to the Sun – that’s pretty far out. But the 1990s saw the discovery of numerous other
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