In combustion, substance reacts with oxygen to produce heat and light.

Sun also produces heat and light, but there is no oxygen in space. So, sun cannot undergo combustion to produce heat and light.

It produces heat and light due to nuclear reactions

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Maninder Singh's photo - Co-founder, Teachoo

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo