# Gravitational Effects on Age

A 1.2 solar mass neutron star of radius 10 km was formed during the Crab nebula supernova 6300 light years away from Earth. The supernova was first observed on Earth in 1054 AD. How much older (in years) are the neutrons of the surface of the star than those at the centre of the star? Round to the nearest tens.

Assumptions

1) The current year in this problem is 2014.

2) One solar mass = $$2 \times {10}^{30} kg$$

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