An overview of the Chandra mission and goals, Chandra's namesake, top 10 facts.
Classroom activities, printable materials, interactive games & more.
Overview of X-ray Astronomy and X-ray sources: black holes to galaxy clusters.
All Chandra images released to the public listed by date & by category
Current Chandra press releases, status reports, interviews & biographies.
A collection of multimedia, illustrations & animations, a glossary, FAQ & more.
A collection of illustrations, animations and video.
Chandra discoveries in an audio/video format.
Q&A: Cosmology

Q:
The thought of an expanding universe is fascinating. With that in mind, can "time" or the passage of time in our reality, speed up or go by faster?

A:
It is all relative. Time in a galaxy in the galaxy cluster 3C295 that is receding from us as part of the overall expansion of the universe will appear to pass about 46% more slowly to us since it is located at a distance corresponding to a red shift of 46%, or about 5 billion light years. Conversely, residents of that galaxy would observe that our Milky Way Galaxy is receding from them, and that time in our galaxy is passing more slowly.


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