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This is the Hubble extreme deep field. With the exception of (from what I can find) 3 foreground stars, every object you see in this picture is a galaxy. Can you find the foreground stars? Know the trick?
@evilscientistca I don't know the trick, but I'm guessing they're the ones whose light forms a star-like glare... is it right? If so, why is it? 🙂
The diffraction spikes are because stars are too small to be resolved by the telescope.
/u/lmxbftw‘s answer in this thread is a good explanation of the phenomenon: https://www.reddit.com/r/askscience/comments/2sn7dn/why_do_only_stars_have_refraction_spikes_in_this/
@paanvaannd @evilscientistca great! Got it! :D
Thanks for the answer