Are there other things like life? In this text SN 56.46 Andhakara Sutta: Darkness, the Buddha seems to say, in my opinion, that life is much more stressful than black holes. 

And I think life is an anomaly in this universe just like black holes, stars, time, quantum entanglement and such. 

But are there any other things he has mentioned that are outlandish and we are unable to comprehend by using juxtapositions as always? Or did he just ignore them completely as they were not important?

Sorry if my question is not clear. I always have a hard time interpreting what's in my head to words.
Going off of what Dhammadhatu posted, the word used in the sutta, lokantarika, is not so much &quot;life&quot; but &quot;this world and the other world&quot;. So black holes, quantum entanglement, every objectively measurable phenomenon (and many subjective phenomena as well) is included in that.
I'm not sure the term outlandish is appropriate, but I think I understand you to mean examples of metaphors involving vast numbers, powers, amount and the like. There are suttas where the Buddha says that all the salt-water in all the oceans is less than the tears we have cried throughout our wandering in Samsara as a way of illustrating the vast timescales. A similar sutta describes (I think) all the rivers in the world as holding less than the amount of blood spilled from our beheadings. And of course the turtle, living at the bottom of a great ocean, surfacing once a century, and a hoop floating on the top of that ocean being carried about by currents. It was said that the chances of encountering a Buddha and their dhamma was less than the chance of that turtle putting its head through the ring. So we are then fortunate to live in a time where we can hear that dhamma!
As for your last question, there were some questions that the Buddha strictly refused to answer based on their being irrelevant to the task of understanding and eliminating suffering. Those were: is the universe/world system eternal or not? Infinite or not? Does a Buddha exist after death? Not exist? Both? Neither? When asked these, the Buddha refused to answer as they were not relevant. Hope this helps!