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File:Hubblecast 21 Special.webm

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Original file (WebM audio/video file, VP8/Vorbis, length 7 min 42 s, 1,920 × 1,080 pixels, 3.62 Mbps overall, file size: 199.51 MB)

Captions

Captions

Hubblecast 21: From silver to silicon. How astrophotography advanced astronomy.

Summary

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

Observing the Universe through the eyepiece of a telescope is one thing, but recording the observations for posterity is something quite different. Originally astronomers used pen and paper to draw what they saw, but the human eye is a lousy detector and our brain can play tricks on us. Astrophotography, first explored in the mid-nineteenth century, has proved to be a powerful, objective way of recording telescopic images with the advantage that long exposures revealed much more than the eye could ever see. But the true revolution arrived with electronic detectors and digital image processing.

Credit:ESA/Hubble (M. Kornmesser & L. L. Christensen)
Date
Source Hubblecast 21 Special: From silver to silicon
Author see above
Permission
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attribution
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w:en:Creative Commons
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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution:
ESA/Hubble
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Assessment

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Media of the day This file was selected as the media of the day for 03 July 2026. It was captioned as follows:
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File history

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Date/TimeThumbnailDimensionsUserComment
current10:07, 8 March 20187 min 42 s, 1,920 × 1,080 (199.51 MB)ComputerHotline (talk | contribs)Imported media from https://cdn.spacetelescope.org/archives/videos/hd_1080p25_screen/hubblecast21a.mp4

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Format Bitrate Status Encode time
VP9 1080P 2.86 Mbps Completed 00:45, 25 February 2026 30 min 6 s
VP9 720P 1.37 Mbps Completed 00:45, 25 February 2026 17 min 29 s
VP9 480P 750 kbps Completed 00:45, 25 February 2026 11 min 23 s
VP9 360P 461 kbps Completed 00:45, 25 February 2026 7 min 22 s
VP9 240P 306 kbps Completed 00:45, 25 February 2026 6 min 19 s
WebM 360P 559 kbps Completed 00:38, 25 February 2026 5 min 33 s
QuickTime 144p (MJPEG) 967 kbps Completed 02:23, 25 February 2026 34 s

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