These are the planets Uranus and Neptune. These planets have an atmosphere that is primarily composed of hydrogen and helium, but with much higher amounts of more complex molecules, such as methane, which gives them a blueish color.
These are the planets Uranus and Neptune. These planets have an atmosphere that is primarily composed of hydrogen and helium, but with much higher amounts of more complex molecules, such as methane, which gives them a blueish color.