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- Mon Oct 17, 2011 11:16 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: MACS 1206: A Galaxy Cluster Lens... (2011 Oct 17)
- Replies: 20
- Views: 4191
Re: APOD: MACS 1206: A Galaxy Cluster Lens... (2011 Oct 17)
My comment on: The foreground cluster can only create such smooth arcs if most of its mass is smoothly distributed .... and therefore not concentrated ... A possible alternative explanation for the smooth gravitational arcs: 1. We observe the light of the background galaxy after B billions of years,...