The Conversation

The long hunt for new objects in our expanding solar system

Author: The Conversation

Artist's impression: Looking back 12.9-billion km towards the sun and the inner solar system from Sedna, one of the recently discovered minor planets in the Kuiper belt.NASA, ESA and Adolf Schaller

Recognise these planet names: Vulcan, Neptune, Pluto, Nemesis, Tyche and Planet X? They all have one thing in common: their existence was predicted to...

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