Planck length - what is it really?

AI Thread Summary
The Planck length is considered the smallest measurable unit in physics, approximately 1.6 x 10^-35 meters, below which conventional physics breaks down. Some interpretations suggest that nothing can be smaller than the Planck length, while others propose it is a threshold for unique physical phenomena. The discussion raises the question of whether singularities, such as those found in black holes, can exist at scales smaller than the Planck length. This ambiguity highlights ongoing debates in theoretical physics regarding the nature of space and time at quantum scales. Understanding the Planck length is crucial for advancing theories in quantum gravity and cosmology.
Dialga
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Hello everyone.

After reading most of the existing topics on the Planck length, I still haven't found what the Planck length really is. Some references say nothing can possibly be smaller than the Planck length, whereas others say it's just a threshold below which "special" things happen.

So... can things be smaller than the Planck length, or not? Most importantly, can a singularity be smaller than the Planck length?

Thanks in advance.
 
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