Question

astronomer see the light in the sky for several months
how astronomers can tell the light is from a star or a planet

Answer 1

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"You take the light from a star, planet or galaxy and pass it through a spectroscope, which is a bit like a prism letting you split the light into its component colours. "It lets you see the chemicals being absorbed or emitted by the light source.

Answer 2

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❥"You take the light from a star, planet or galaxy and pass it through a spectroscope, which is a bit like a prism letting you split the light into its component colours.

❥"It lets you see the chemicals being absorbed or emitted by the light source.