Why is the suns spectrum and the moon's spectrum the same?

Answer 1

Because the light we see given off by the moon - is actually the reflection of sunlight. Therefore they will have the same spectrum. The moon does not generate its own light.

Answer 2

The sun and the moon's spectra are not the same. The Sun's spectrum shows continuous radiation across a range of wavelengths due to its high temperature, while the moon's spectrum shows reflected sunlight with absorption lines due to its lack of inherent light source. They have different compositions and physical properties affecting their spectra.