The strength of infrared radiation from Jupiter implies that Jupiter has

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When considering what the observed infrared radiation from Jupiter implies, we start by examining what IR emissions reveal about a planet's thermal state.
Option 1: 'a strong magnetic field' — A magnetic field does not directly explain infrared brightness. It affects charged particle environments and radio emissions, not the planet’s overall thermal radiation in the infrared spectrum, so this is not a direct inference from IR strength.
Option 2: 'a very cold solid surface' — A very cold surface would typically emit little infrared radiation. In fact, strong IR emission suggests warmth not a frigid surface; plus, Jupiter is a gas giant without a solid surface to the depth that would matter for IR output, making this claim inconsistent with the observed warmth.
Option 3: 'an internal source of heat' — This is the key implication. Jupiter emits more infrared energy than it receives from the Sun, which indicates an internal heat source (gravitational contraction and slow cooling). The excess infrared output demonstrates internal warmth rather than a sole dependence on sunlight.
Option 4: 'strong 'Van Allen' belts' — The Van Allen belts are regions of charged particles trapped by a magnetic field and do not set the planet’s infrared emission levels. They are related to magnetospheric dynamics, not to thermal infrared output, so this option misattributes the cause of IR strength.
Option 5: 'an atmosphere made up mostly of hydrogen' — While Jupiter's atmosphere is indeed mostly hydrogen, this composition alone does not explain strong infrared emission. The key inference from IR strength is the presence of internal heat, not merely atmospheric composition.
Overall, the strongest link is the presence of an internal heat source driving Jupiter’s infrared radiation, rather than external illumination or unrelated magnetic and atmospheric features.

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

The strength of infrared radiation from Jupiter implies that Jupiter has

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