# Another look at Black Hole Spins

## TL;DR

This paper discusses the fundamental question of whether black holes rotate and how fast, highlighting observational challenges and future prospects for precise spin measurements.

## Contribution

It provides a comprehensive review of current challenges and future opportunities in measuring black hole spins.

## Key findings

- Current observational methods face significant challenges.
- Future facilities may enable more precise spin measurements.
- Understanding black hole spins has broad astrophysical implications.

## Abstract

Do black holes rotate, and if yes, how fast? This question is fundamental and has broad implications, but still remains open. There are significant observational challenges in current spin determinations, and future facilities offer prospects for precision measurements.