A large amount of methane gas absorbs much of the red and infrared light hitting it. This explains why

Question

BlackTom AI · Accepted Answer

When evaluating why a gas like methane would affect the appearance of a planet, it's helpful to connect the absorption characteristics to the observed color.
Option 1 suggests Mars has a reddish color; while Mars is indeed red-orange due to iron oxide on its surface, this color stems from surface material rather than atmospheric methane absorption, so this choice describes a different mechanism.
Option 2 attributes Jupiter's Great Red Spot to a reddish color caused by methane absorption; however, the Great Red Spot's color is primarily due to complex atmospheric chemistry, including various colored compounds and clouds, not methane alone, making this explanation incomplete.
Option 3 correctly links methane’s selective absorption of red and infrared light to a blue-green appearance; when a planet’s atmosphere contains methane that absorbs those wavelengths, the reflected light shifts toward blue-green, which is observed for Uranus and Neptune.
Option 4 mentions the limb of the Sun appearing reddened; while the Sun’s limb can exhibit color-related effects due to limb darkening and scattering, this phenomenon is unrelated to atmospheric methane on planets and does not explain a planetary color caused by atmospheric absorption.
Option 5 discusses sunsets on Earth appearing red, a well-known result of Rayleigh scattering and atmospheric path length, but this scenario involves the Earth's atmosphere, not methane absorption in planetary atmospheres, so it does not support the stated scenario.
In summary, the combination of methane absorbing red and infrared light leading to a blue-green planetary appearance aligns with observations of Uranus and Neptune, while the other options point to distinct color causes unrelated to methane-driven absorption.

ASTRON 2140 AU2025 (23428) Quiz 4 - 2025 Nov 21

A large amount of methane gas absorbs much of the red and infrared light hitting it. This explains why

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