Here's how it works:
* Methane absorbs red light: Methane gas in Neptune's atmosphere strongly absorbs red light from the Sun.
* Blue light reflects: The remaining light, which is primarily blue, is scattered and reflected back into space. This is why we see Neptune as blue.
It's similar to how the sky appears blue on Earth - our atmosphere scatters blue light more effectively than other colors.
While Neptune is primarily blue, it can sometimes appear slightly reddish in certain areas. This is due to the presence of other trace elements in its atmosphere, such as hydrogen sulfide, which can give it a more reddish hue.
