Question

we know there is hydrogen in uranus surface then why there is not helium to produce light and heat

Answer 1

because nuclear fussion coul not take place due to absence of heat on surface of uranus.

Answer 2

Hey there,

Hydrogen nuclei fuse with the same species of atoms to form Helium as in the case of sun. But this require temperature of the order 10⁷ K and the temperature is far lower about 10 K so no nuclear fusion can occur. As a result, no Helium is produced.

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