ESOcast 95 Light: How Big is a Star? (4K UHD)

It’s hard to comprehend the sheer size of objects in space , but let’s give it a try!

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All ESOcasts

ESOcast 71: Nye teleskoper jagter exoplaneter fra Paranal
ESOcast 63: fleksible kæmper -  udviklingen af teleskopspejle
ESOcast 60: polarisationsbillede af exoplaneter
ESOcast 57: ESOs VLT fejrer 15 succesfulde år
ESOcast 51: Alle systemer er klar for højest beliggende supercomputer
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ESOcast is a video podcast series dedicated to bringing you the latest news and research from ESO – Astronomy made on planet Earth. Here we explore the Universe's ultimate frontier with our host Doctor J, a.k.a. Dr. Joe Liske.

The ESOcast is offered for download in several formats: standard (.mov, .mpeg, .mp4, .m4v) and HD (High Definition). HD is rapidly evolving into one of the leading video formats in the video on-demand market. Information on the specs of the available video formats is accessible on the Video Formats Page.

ESOcast HD videos can be watched on TV by the use of digital media receivers such as Apple TV.


Standard Definition (640 x 480)


iTunes ESOcast SD in iTunes

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High Definition (1280 x 720)


iTunes ESOcast HD in iTunes

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The ESOcast is also available on:

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Who is Dr. J?


Dr. J is a German astronomer. His scientific interests are in cosmology, particularly on galaxy evolution and quasars. Dr. J's real name is Joe Liske and he has a PhD in astronomy.