ESOcast 135: Why Astronomers Want to Use ALMA — ALMA is a Time Machine!

2 November 2017

What happened at the beginning of the Universe? It’s a question astronomers have pondered for a long time. Whilst we can’t actually travel back in time, astronomers are able to see into the past and observe galaxies and stars that were made when our Universe was still very young. Because light travels at a finite speed, the further away an object is, the longer its light has taken to reach us — so we see distant objects as they were in the past. To see the most distant celestial objects astronomers use some of the world’s most advanced telescopes, many of them unique — like ALMA.

ESOcast 135 describes how ALMA enables astronomers see into the past and learn more about what our Universe was like when it was young.

You can subscribe to the ESOcasts on iTunes, receive future episodes on YouTube or follow us on Vimeo.

Many other ESOcast episodes are also available.

Find out how to view and contribute subtitles to the ESOcast in multiple languages, or translate this video on YouTube.



Richard Hook
ESO Public Information Officer
Garching bei München, Germany
Tel: +49 89 3200 6655
Cell: +49 151 1537 3591

About the Announcement



Screenshot of ESOcast 135
Screenshot of ESOcast 135


ESOcast 135: ​ALMA​ ​is​ ​a​ ​timemachine!
ESOcast 135: ​ALMA​ ​is​ ​a​ ​timemachine!