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2006: Pluto declared a dwarf planet. Video, 00:00:572006: Pluto declared a dwarf planet

The man who 'killed' Pluto. Video, 00:04:10The man who 'killed' Pluto

Witness History. When Pluto lost its planet status. Audio, 9 minutesWitness History

Space probe 'transforms planet formation theory'

Nasa 're-masters' the greatest ever 'selfie'

Distant object 'like nothing seen before'

Come in #PlanetNine

Brian May celebrates distant exploration. Audio, 00:02:57Brian May celebrates distant exploration

Nasa waits for signal from Ultima Thule probe

Where is Ultima Thule? Video, 00:01:04Where is Ultima Thule?

The 'frontier of the Solar System' Video, 00:02:14The 'frontier of the Solar System'

Spacecraft on path for historic flyby

Methane ice dunes found on Pluto

New Horizons strikes distant gold

Looking forward to New Horizons' next target. Audio, 00:04:46Looking forward to New Horizons' next target

Can you help astronomers find Planet Nine?