Answer: A white dwarf star.
- A A planet
- B A black hole
- C A white dwarf star
- D A neutron star
Correct answer: C. A white dwarf star
Explanation: Chandrasekhar limit (~1.4 solar masses) is the maximum mass of a stable white dwarf. Above this, it collapses further.
g is maximum at Earth's surface; going up, it falls off as 1/r² (inverse-square); going down, it falls off linearly with depth (since only the mass enclosed within radius r contributes), reaching zero at the centre.
Concept context
Universal gravitation, orbital mechanics, gravitational potential, and escape velocity.