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What could be out there? That question eventually led to the discovery of Pluto. ESO/L. Calçada

Finding Pluto: the hunt for Planet X

The existence of a "Planet X" in the outer solar system was the subject of great speculation, and was finally settled with the discovery of Pluto in 1930.
One of the most detailed images of Pluto captured by New Horizons just before it’s closest approach to the dwarf planet. NASA/APL/SwRI

Beyond Pluto: New Horizons' mission is not over yet

Now the flypast of Pluto is over the space probe New Horizons will begin sending the data back to Earth. It will take many months but what will it reveal about the dwarf planet?
The last photo sent to Earth by New Horizons before its flyby, and arguably the ‘textbook’ photo of the planet for the next few decades. NASA

Live blog: New Horizons flyby of Pluto

Join Tanya Hill as she live blogs the New Horizons flyby of Pluto at 9.30pm AEST tonight.
New Horizons' look at Pluto’s Charon-facing hemisphere reveals intriguing geologic details that are of keen interest to mission scientists. This image was taken on July 11, 2015, when the spacecraft was 4 million km from Pluto. NASA/JHUAPL/SWRI

Pluto and its collision-course place in our solar system

The New Horizons spacecraft is only hours away from its closest approach to Pluto. It's hoped the brief encounter will help answer many questions about the oddball member of our solar system.

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