One of the greatest challenges of modern physics is to find a coherent method for describing phenomena, on the cosmic and microscale. For over a hundred years, to describe reality on a cosmic scale we have been using general relativity theory, which has successfully undergone repeated attempts at fa...
To describe phenomena on the scale of atoms, we use the second great theory: quantum mechanics, which differs from general relativity in basically everything. It uses flat space-time and a completely different mathematical apparatus
It's weird to me, that the common method of attempting to describe a four dimensional thing is to immediately reduce the three dimensional thing to two dimensions...
The word "curved" is problematic for the concept of space-time because it invokes one or two dimensional thought. Space-time is a four dimensional model.
The best description of the effect of gravity on space-time on my opinion is actually a joke... Gravity sucks :)
The definition of a right angle depends on the number of dimensions. Perpendicularity and parallelism are different in higher dimensions. Space is hard.