What makes Uranus appear blue? aoxygen in its atmosphere bcarbon dioxide in its atmosphere cmethane in its atmosphere dwater in its atmosphere

Analyzing the Question

Uranus is known for its blue color, which can be attributed to its atmospheric composition. The question presents different gases that could potentially affect the color appearance of the planet.

Relevant Concepts

The primary reason for the blue appearance of Uranus is the presence of methane (CH₄) in its atmosphere. Methane absorbs red light and reflects blue light, which is why Uranus appears blue to observers.

Detailed Analysis

1. Composition of Uranus's Atmosphere: The atmosphere of Uranus is mostly composed of hydrogen and helium, with a small amount of methane.
2. Absorption and Scattering: Methane absorbs light in the red part of the spectrum while scattering the blue light, giving Uranus its characteristic color.

Verification and Summary

The gases presented as options can be evaluated:

• A (Oxygen): Oxygen does not give Uranus its blue color.
• B (Carbon Dioxide): Carbon dioxide does not have a significant effect on the color of Uranus.
• C (Methane): This is the correct answer as it is the primary reason for Uranus's blue hue.
• D (Water): While water is present, it does not have the same significant effect on the blue appearance as methane.

Final Answer

C) Methane in its atmosphere is what makes Uranus appear blue.