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Using Quasars to Measure the Earth: A Brief History of VLBI

VLBI, or Very Long Baseline Interferometry, is a technique that uses multiple radio telescopes to very precisely measure the Earth's orientation. It was originally invented back in the 1960s to take better pictures of quasars, but scientists soon found out that if you threw the process in reverse, you could measure how the ground beneath the telescopes moves around, how long days really are, and how the Earth wobbles on its axis as it revolves around the sun! Learn more about VLBI here!

This video is presented in both stereoscopic 3D and standard 2D versions. The labels below will help you pick which video is right for your display!

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2D/3D VERSIONS - INDIVIDUAL LEFT/RIGHT VIDEOS: Learn more about VLBI in this video! This version contains both the left and right videos for stereoscopic 3D presentations. If you'd like a standard (2D) version, just pick a format--either the left or the right video will work just fine! The labels below will help you identify the formats and the left/right versions.    2D/3D VERSIONS - INDIVIDUAL LEFT/RIGHT VIDEOS: Learn more about VLBI in this video!

This version contains both the left and right videos for stereoscopic 3D presentations. If you'd like a standard (2D) version, just pick a format--either the left or the right video will work just fine! The labels below will help you identify the formats and the left/right versions.

For complete transcript, click here.
Duration: 1.9 minutes
Available formats:
  1280x720 (29.97 fps) WMV (Windows Media (Left Eye)) 62 MB
  960x540 (29.97 fps) MPEG-4 (Apple TV (Left Eye)) 54 MB
  640x360 (29.97 fps) MPEG-4 (iTunes HD (Left Eye)) 21 MB
  320x240 (29.97 fps) MPEG-4 (iPod (Left Eye)) 11 MB
  640x360 (29.97 fps) QT (QuickTime (Left Eye)) 52 MB
  1920x1080 (29.97 fps) QT (ProRes 1080p (Left Eye)) 1 GB
  1280x720 (29.97 fps) QT (ProRes 720p (Left Eye)) 948 MB
  1920x1080 (29.97 fps) QT (YouTube 1080p (Left Eye)) 209 MB
  1280x720 (29.97 fps) QT (YouTube 720p (Left Eye)) 69 MB
  1280x720 (29.97 fps) WMV (Windows Media (Right Eye)) 62 MB
  960x540 (29.97 fps) MPEG-4 (Apple TV (Right Eye)) 54 MB
  640x360 (29.97 fps) MPEG-4 (iTunes HD (Right Eye)) 21 MB
  320x240 (29.97 fps) MPEG-4 (iPod (Right Eye)) 11 MB
  640x360 (29.97 fps) QT (QuickTime (Right Eye)) 52 MB
  1920x1080 (29.97 fps) QT (ProRes 1080p (Right Eye)) 1 GB
  1280x720 (29.97 fps) QT (ProRes 720p (Right Eye)) 949 MB
  1920x1080 (29.97 fps) QT (YouTube 1080p (Right Eye)) 208 MB
  1280x720 (29.97 fps) QT (YouTube 720p (Right Eye)) 69 MB
  960x540 (29.97 fps) WEBM         23 MB
  1024x576   JPEG         66 KB
  320x180     PNG           132 KB
How to play our movies


3D VERSION - SIDE-BY-SIDE: This version of the video is rendered in the side-by-side format used by some stereoscopic 3D displays.    3D VERSION - SIDE-BY-SIDE: This version of the video is rendered in the side-by-side format used by some stereoscopic 3D displays.
Duration: 1.9 minutes
Available formats:
  1280x720 (29.97 fps) WMV (Windows Media) 62 MB
  960x540 (29.97 fps) MPEG-4 (Apple TV) 54 MB
  640x360 (29.97 fps) MPEG-4 (iTunes HD) 21 MB
  320x240 (29.97 fps) MPEG-4 (iPod) 11 MB
  640x360 (29.97 fps) QT (QuickTime) 52 MB
  1920x1080 (29.97 fps) QT (ProRes 1080p) 1 GB
  1280x720 (29.97 fps) QT (ProRes 720p) 968 MB
  1920x1080 (29.97 fps) QT (YouTube 1080p) 227 MB
  1280x720 (29.97 fps) QT (YouTube 720p) 68 MB
  960x540 (29.97 fps) WEBM         23 MB
  1024x576   JPEG         71 KB
How to play our movies

Short URL to This Page:http://svs.gsfc.nasa.gov/goto?10964
Animation Number:10964
Completed:2012-06-01
Animator:Chris Smith (HTSI) (Lead)
Video Editor:Chris Smith (HTSI)
Narrator:Steven J. Wall (MUNIZ)
Producer:Chris Smith (HTSI)
Scientist:Chopo Ma (NASA/GSFc)
Writer:Chris Smith (HTSI)
Series:Narrated Movies
Goddard TV Tape:G2012-060 -- Using Quasars to Measure the Earth: A Brief History of VLBI
Please give credit for this item to:
NASA/Goddard Space Flight Center
 
Keywords:
SVS >> Earth
SVS >> HDTV
SVS >> Music
SVS >> Quasar
SVS >> Edited Feature
SVS >> Interview
DLESE >> Narrated
SVS >> Radio Telescope
SVS >> Geodesy
NASA Science >> Earth
NASA Science >> Universe
SVS >> VLBI
SVS >> Very Long Baseline Interferometry
 
 


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Many of our multimedia items use the GCMD keywords. These keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0

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