Neptune's sky isn't blue like Earth's! It's actually a deep, rich blue color. This color is caused by methane, which absorbs red light from the sun and reflects blue light.

Here's a breakdown:

* Methane's Role: Methane gas in Neptune's atmosphere absorbs red light and lets blue light pass through.

* Scattering: The blue light gets scattered by tiny particles in the atmosphere, creating the deep blue color we see.

So, while it might seem like a familiar blue, it's actually a different kind of blue than we experience on Earth.