Are there other things like life?

SN 56.46 says:

Mendicants, the boundless desolation of lokantarikā is so utterly dark that even the light of the moon and the sun, so mighty and powerful, makes no impression.”

Atthi, bhikkhave, lokantarikā aghā asaṃvutā andhakārā andhakāratimisā, yatthamimesaṃ candimasūriyānaṃ evaṃmahiddhikānaṃ evaṃ mahānubhāvānaṃ ābhāya nānubhontī .

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Concise Pali English Dictionary

lokantarika adjective situated between the worlds

The Pali suttas have the stock phrase: "This world & the other world". This seems to have different meanings (such as in MN 26, where the other world appears to refer to lower worlds). But, generally, in the Buddha's society, it meant the ordinary human world and the heavenly world of the Brahmins. Thus, in Buddhism, the 'other world' can be 'heaven' or meditation jhanas; where MN 79 refers to the meditation jhanas as "a world of exclusively pleasant feelings" (ekantasukhassa lokassa).

In other words, lokantarikā in SN 56.46 appears to refer to the 'world' between the world of ordinary worldly sensual life and the world of meditation happiness; what Christians mystics called "the dark night of the soul", which is a period of spiritual desolation suffered by a mystic in which all sense of consolation is removed.

For example, when a person suffers from sever psychological depression, the light of the moon and the sun makes no impression. Similarly, as occurred to Mother Teresa of Calcutta, nothing, not even ideas of Jesus or God, could help her in her spiritual desolation.

Jesus has a very special love for you. [But] as for me--The silence and the emptiness is so great--that I look and do not see,--Listen and do not hear.

Mother Teresa

In SN 56.46, the term 'lokantarikā' possibly refers to 'spiritual desolution' or what Christian meditators attempting to overcome the five hindrances called 'the dark night of the soul'.

If you have doubts about my answer, similar to a certain monk in DN 11 Kevatta Sutta, you can ask about the meaning of the term 'lokantarikā' at Sutta Central.

I think you have misunderstood it. It's not saying that life is stressful.

You may think SN 56.46 is talking about suffering or dukkha. Please see this answer for a detailed definition of dukkha.

But it's not talking about suffering. It's talking about ignorance or avijja. Ignorance is about not knowing and not fully understanding the four noble truths, the three marks of existence and dependent origination.

Ignorance or avijja is darker and scarier than the darkest voids and black holes in interstellar space. That's the message.

"lokantarika" (cosmologist), a school of thought, called this at the Buddha's time, is good to understand as Science, Cosmology, Secularism or Materialism nowadays. This might then give light in the darkness related to the arisen question.

Going off of what Dhammadhatu posted, the word used in the sutta, lokantarika, is not so much "life" but "this world and the other world". 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!