Main content
The Universe's Greatest Mystery?
Why is the Universe Expanding!? The Sky at Night is investigating the biggest mystery in the cosmos. Watch now on iPlayer.
Duration:
This clip is from
More clips from The Expanding Universe
-
![]()
Vera Rubin Observatory: The Largest Camera Ever Built!
Duration: 00:40
-
![]()
DESI Rewrites the Textbooks
Duration: 00:49
-
![]()
Starguide: September 2025
Duration: 07:26
More clips from The Sky at Night
-
![]()
A Brand-New Mineral
Duration: 01:05
-
![]()
Sometimes, it's the simple things...
Duration: 01:01
-
![]()
Ancient Rocks & New Science
Duration: 01:31
-
![]()
Eyes on the Skies
Duration: 00:43
