Hubblecast 23 Special: Seeing the invisible

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In this new Hubblecast episode, Dr. J guides us through the fifth chapter of Eyes on the Skies, the International Astronomical Union's movie celebrating the telescope on its 400th anniversary in 2009.

The Universe is a black void, with a scattering of stars, nebulae and galaxies – or so it appears to observers using visible light. But if we include other forms of radiation invisible to us, the picture changes completely: clouds of interstellar hydrogen gas, emitting radio waves; stellar nurseries, glowing in the infrared; explosive outbursts of gamma rays and the all-sky background hiss of the Big Bang, diluted by almost fourteen billion years of cosmic expansion. So how do astronomers learn about the unseen Universe? By building telescopes and detectors that can see the invisible. Watch this Hubblecast episode and find out more.

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ESA/Hubble (M. Kornmesser & L. L. Christensen)

Visual design & Editing: Martin Kornmesser

Animations: Martin Kornmesser & Luis Calçada

Web Technical Support: Lars Holm Nielsen & Raquel Yumi Shida

Written by: Govert Schilling & Lars Lindberg Christensen

Host: Dr. J

Narration: Howard Cooper & Bob Fosbury

Cinematography: Peter Rixner

Music: movetwo

Footage and photos: for a complete list of credits, please check this link

Directed by: Lars Lindberg Christensen

About the Video

Release date:25 November 2008, 16:00
Duration:09m 12s

About the Object

Type:• X - HD Videos
• X - Hubblecast Videos


Large QT
142.2 MB


Video Podcast
105.3 MB
Medium MPEG-1
232.6 MB
Medium Flash
120.6 MB


Small Flash
53.7 MB
Small QT
34.6 MB

For Broadcasters

Broadcast SD
2.7 GB


212.4 KB

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