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December 21, 2025
Day 21 of the 2025 Space Telescope Advent Calendar: Warped Space
Day 21 of the 2025 Space Telescope Advent Calendar: Warped Space. This Hubble view of Galaxy Cluster Abell 209, about 2.8 billion light-years away, shows more than 100 galaxies. The incredible mass of the galaxies together warps and magnifies images of background galaxies and stars in a process called gravitational lensing, which can be seen in the stretched and smeared clumps toward the center of the image.
TL;DR
- Hubble image features Galaxy Cluster Abell 209.
- The cluster is located 2.8 billion light-years away and contains over 100 galaxies.
- Gravitational lensing, caused by the cluster's mass, warps and magnifies background objects.
- The lensing effect appears as stretched and smeared clumps in the image.
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