Consider a hypothetical planetary system, within the Milky Way Galaxy, orbiting a central star known as Los. The star and planets, known collectively as the Ralos System, are to be found about two-thirds of the way out from the Galactic centre.


(Q)
One of the other planets in the Ralos System is Htrae, a relatively small, compact body, with an atmosphere, oceans of liquid water and a hard rocky crust that provides a surface for its inhabitants to live on. The inhabitants of Htrae have determined that their planet has an absolute age of 4.5 × 109 years. Explain the principle of a method they might have used to determine their planet’s age. PLEASE BE AS SPECIFIC SA POSS THANKS.

What are your thoughts? Do you realise that the question is really asking about how we determine the age of the Earth?

Los is Sol backwards and Htrea is an anagram for earth. Not subtle...