1. Computer artwork of the Sun (left) and the eight planets of the solar system and the dwarf planet Pluto (far right).

    US astronomers claim to have strong evidence that there is a ninth planet in our Solar System. We asked you to send us your suggested names for this new arrival.

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  2. Video content

    Video caption: Queen guitarist Brian May celebrates New Horizons exploration

    The rock legend Brian May releases a song to celebrate the New Horizons probe's flyby of Ultima Thule.

  3. Video content

    Video caption: Nasa mission to Ultima Thule: The where, what and why

    Nasa's New Horizons probe is about to make the most distant ever exploration of a Solar System object.

  4. Video content

    Video caption: Ultima Thule: The 'frontier of the Solar System'

    Alan Stern, chief scientist on Nasa's New Horizons probe, looks forward to the flyby of Ultima Thule.

  5. Video content

    Video caption: Looking forward to New Horizons' next target

    The American New Horizons probe is set to flyby a small icy body on New Year's Day, 2019.