1. Hubblecast 58: Caught in the cosmic web

    06:51

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    In this episode of the Hubblecast, Joe Liske (aka Dr J) shows how a team of astronomers has used Hubble and a battery of other telescopes to discover the secrets of massive galaxy cluster MACS J0717. They have found that an invisible filament of dark matter extends out of the cluster. This is our first direct glimpse of the shape of the scaffolding that gives the Universe its structure. More information and download-options: http://www.spacetelescope.org/videos/heic1215a/ Credit: ESA/Hubble Visual design and editing: Martin Kornmesser Web and technical support: Mathias Andre and Raquel Yumi Shida Written by: Oli Usher Presented by: Joe Liske (Dr J) Images: NASA, ESA, Harald Ebeling (University of Hawaii at Manoa), Jean-Paul Kneib (LAM) Visualisations: Luis Calçada Footage: Herbert Zodet Music: Toomas Erm Directed by: Oli Usher Cinematography: Peter Rixner (www.perix.de), Herbert Zodet Executive producer: Lars Lindberg Christensen

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    • Hubblecast 59: Unweaving the rainbow

      06:14

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      In this episode of the Hubblecast, we do away with Hubble’s stunning pictures of the cosmos, and focus on one of the telescope’s most important — but least known — functions. Like a digital camera, Hubble’s cameras produce colour images by sampling just a handful of colours and combining them together into one picture. The detail is extraordinary — but while the colours are accurate enough for the human eye, they are not good enough for some kinds of scientific work, such as the study of distant galaxies and extrasolar planets. For much of their research, astronomers use Hubble’s spectrometers, devices that split up light into a rainbow of component colours, to reveal many of the hidden properties of the Universe. These observing methods may not produce attractive images, but they lie behind some of the most profound science that Hubble does. In this episode, presenter Joe Liske (aka Dr J) and Hubble astronomer Bob Fosbury give a introduction to spectroscopy using Hubble, how it works, and what it’s for. More information and download-options: http://www.spacetelescope.org/videos/hubblecast59a/ Credit: ESA/Hubble Visual design and editing: Martin Kornmesser Web and technical support: Mathias Andre and Raquel Yumi Shida Written by: Oli Usher Interviews: Oli Usher Filming: Herbert Zodet Presented by: Joe Liske (Dr J), with Bob Fosbury Narrator: Sara Mendes da Costa Images: NASA, ESA, Bob Fosbury, Martin Kornmesser Visualisations and animations: Luis Calçada, Martin Kornmesser, André Roquette. Music: Steve Buick Directed by: Oli Usher Cinematography: Peter Rixner (www.perix.de) Executive producer: Lars Lindberg Christensen

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