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Originally Posted by The Bad Astronomer
In the STIS Southern Deep Field, we saw objects of visual magnitude 31.5 with decent signal. We saw magnitude 31 objects for sure. They might be stars or galaxies; they were simply dots in the image. We'd need spectra to know for sure, and that takes literally a thousand times as long to do. That's unlikely, given that the deep field was a 10 day exposure.  |
Wow... I'm amazed that a 10 day exposure can be done at all, and isn't completely saturated by light. Even most relatively dim objects would be hugely bright, no?