Why is Uranus blue
Within our solar system various of planets appear to observers in a range of hues dependent upon a number of factors. While many of them show a range of colors largely derived from the overall land color viewable through the atmosphere some of them, such as Uranus, exhibit their iconic color from the various gases located within their atmosphere itself.
Consisting primarily of hydrogen, helium and methane Uranus’ atmosphere is generally considered to be incapable of maintaining a sufficient ecosystem for organism survival both from its lack of ability to retain sufficient heat (lacking the carbon dioxide that allows Earth to regulate a generally steady temperature) along with what scientists generally consider to be a combination of toxic gases for most creatures. At the same time, however, it is these combination of gases that generate the light blue color of Uranus when viewed either by satellite or telescope.
Absorbing various red rays generated by the sun, methane refracts light in frequencies that typically can only be perceived in the blue spectrum. As Uranus contains a large amount of methane within its atmosphere this causes the planet to absorb primarily red-spectrum energy and refract the pale blue back to observers – thus giving it its remarkable color difference when compared to other planets within the solar system.
This ability to absorb gases is what gives many planets distinct features when being seen from various perspectives, along with even gas giants with no known land masses within their structure to still refract various colors depending on their particular composition. As color is highly dependent upon a specific range of light frequencies radiating off of an object any solid, liquid or gas that can absorb part or all of a frequency can radically change the way an object appears to our eyes, though more complex receptors able to differentiate specific frequencies at a wider range (such as infrared sensors) can generally interpret waves on a much broader scale. For this reason any change in Uranus’ atmospheric conditions and methane content would cause it to lose its blue atmospheric color and potentially resemble other planets whose base internal mass or other gases provide for different visual perceptions.