Which of the following planets has a stratosphere?

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BlackTom AI · Accepted Answer

Question restatement: Which of the following planets has a stratosphere?

Option 1: 'none of these planets has a stratosphere' — This is not correct because at least one planet in the list (Venus) does have a stratospheric layer in its atmosphere. A stratosphere is a layer where temperature changes with altitude in a way distinct from the troposphere, typically due to absorbing gases, and Venus exhibits such a layer.

Option 2: 'Venus' — This is the correct understanding in many introductory astronomy contexts. Venus possesses a well-defined stratosphere where the temperature initially decreases with altitude in the troposphere and then increases in the stratosphere due to the composition and absorption of solar radiation by atmospheric gases, notably CO2 and other constituents in its dense atmosphere.

Option 3: 'Mars' — While Mars does have atmospheric layers (troposphere, mesosphere, and thermosphere), its atmosphere is extremely thin compared to Earth and Venus, and it does not have a pronounced, well-defined stratosphere in the same sense as Venus. Therefore, describing Mars as having a stratosphere would be inaccurate or at least incomplete for a basic question like this.

Option 4: 'Mercury' — Mercury has only a very tenuous exosphere rather than a substantial atmosphere, so there is no true stratosphere to speak of. The concept of a stratosphere requires a meaningful atmospheric layer, which Mercury lacks due to its near-vacuum conditions.

In sum, the key distinction is that Venus’s atmosphere is thick enough and contains the right constituents to support a stratospheric layer, whereas Mars’s thin atmosphere and Mercury’s minimal exosphere do not provide a true stratosphere. The incorrect options claim either that none has a stratosphere or assign the property to planets lacking substantial atmospheres, which contradicts the atmospheric structure of Venus.

EARTHSC 2205 SP2025 (19389) Atmospheres

Which of the following planets has a stratosphere?

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