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
What does it mean when you say that we're seeing light from many years ago?
Because the Universe is very big and the speed of
light isn't infinite, it usually takes many, many years for light from a
star or a galaxy to reach us. So, we are sometimes seeing these objects as
they appeared millions or billions of years ago, when the Universe was
considerably younger than it is now. That's why astronomy is sometimes a
little like time travel, as you say!
