My last calc got humans to Small Planet level, but I forgot something: The Sun orbits the galaxy, which is being pulled toward the great attractor!
The sun moves this fast (828,000 kmph or 230000 m/s)
This gets us 1.2573864722753346080305927342256e+31 tons of TNT
it's gravitational pull is 274 m/s^2 or 16.55295 m/s
This gets us 195545998794375000 tons of TNT
Our galaxy is 1.3 million mph
This gets us 1.20411059057962124770263862332696e+32 Tons of TNT
1.20411059057962124770263862332696e+32+ 1.2573864722753346080305927342256e+31+195545998794375000+6.33276457934990493e+23=1.3298492e+32 Tons of TNT (Small Star level+)
Edit: forgot to divide
1.3298492e+32/70=1.8997846e+30 Tons of TNT (Dwarf Star level) Sadly a downgrade