New Hubble X-treme deep field photo
Posted 30 September 2012 - 12:49 AM
Posted 30 September 2012 - 06:59 AM
the Image they posted is 2.3x2.0 arc minutes
Posted 30 September 2012 - 09:55 AM
There appears to be only two or three actual stars with diffraction spikes visible. I'm wondering how many of those very faint dots are very faint red dwarf stars in our galaxy.
Do they actually get spectra on all the objects visible to verify the red shift & therefore the distance?
I seem to remember there were no stars at all in the UDF, which is why that area of the sky got selected for this. Some of those objects have two sets of diffraction spikes. I would imagine that's the difference in the HST cameras, one being the infrared version they used to accomplish the XDF.