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http://www.bbc.co.uk/news/science-environment-42333783
The American space agency's New Horizons mission has struck gold again.
After its astonishing flyby of Pluto in 2015, scientists have just discovered that the probe's next target is not one object but very likely two.
Earth-based observations suggest the small icy world, referred to simply as MU69, has a moonlet.
It seems New Horizons will now be making a two-for-the price-of-one flyby when it has its encounter on New Year’s Eve and New Year’s Day, 2019.
The plan is for the spacecraft to pass the 30-40km-wide main object with a separation of just 3,500km, acquiring high-resolution pictures and other data.