Question

Planet is a luminous object​

Answer 1

Answer:

Planets only seem to be luminous (seem to be producing their own light) because they reflect the light that comes from the star they orbit; this is the light we see, not light produced by the planet itself. ... Thus, planets just as Jupiter and Saturn, which emit tiny amounts of light in the infrared, are luminous.

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Answer 2

Answer:

Planets and satellites are non-luminous objects which do not produce light on their own but reflect the light falling so they appear bright in the sky. So according to the question, the sun which is a star is a luminous object while the rest of the options are satellites and planets are all non-luminous objects.