If we want to understand the Universe at a fundamental level all the forces on all scales the biggest obstacle facing us is to come up with a correct, consistent, testable and verifiable theory of quantum gravity. To no one's great surprise, we're not quite there yet.
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"You can find many different diagnoses in death certificates, but they're just details. What really kills us is entropy increase." — Sabine Hossenfelder, Existential Physics.