1. Video content

    Video caption: Durham University telescope experts use giant helium balloon

    The football stadium-sized inflatable will carry the device, which was developed with Nasa's help.

  2. Operation Avalanche

    Video content

    Video caption: Two young CIA agents are sent to NASA, where they become involved in a conspiracy.

    Two CIA agents are sent to NASA, under the false pretence of making a documentary, to investigate reports of a mole. But once there, they become entangled in a bigger conspiracy.

  3. Video content

    Video caption: Venus: Missions to shed light on inferno world - astronomer

    Nasa's missions could show why Venus is so different to Earth, a Royal Observatory astronomer says.

  4. Video content

    Video caption: A final test for James Webb telescope's golden mirrors

    Engineers are almost done building and testing the successor to the Hubble Space Telescope.