Here are a few questions about space-time. 1. Mass is directly proportional to curve/dent in s-t. (space-time). What is the constant of proportionality? So, by 1kg. mass how much of a curve is produced? OR by how much mass does the pit deepen by 1 unit length? 2. By critical velocity and centrifugal force, I can understand why planets remain in orbit. But if Sun creates a bowl or a cone shaped pit in space-time, why don’t the planets cave in onto the Sun? 3. A black hole is crushed by internal gravity into a singularity. Just before it becomes a singularity, its volume must be less than an atom’s. Thus there would be millions of protons where there should have been just 1. So, how is matter arranged then? What is this glob of matter called? What is its state? (it is definitely not like particles) 4. Space-time can explain why planets travel when nearer to the Sun. But suppose a rocket is going directly towards the Sun, it should take more time than linear travel (as it also has to travel through the curves of s-t.). But if time goes slower near the Sun, we feel as if it is taking the same time. Is this logical?