What is an atmosphere comparable to Earth's atmosphere?

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In summary, the conversation discusses the similarities between Earth's atmosphere and that of other planets, particularly in terms of composition and potential for supporting life. The comparison is often used to determine if a planet could potentially be habitable for humans. However, there are also non-biological ways in which oxygen can be present in an atmosphere.
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What does it mean when a planet have an atmosphere comparable to the Earth?
Does it mean that the atmosphere is made of the same atoms and molecules like our atmosphere and that it has the same spheres such as trophosphere? And that the temperatures in these spheres are also the same or very similar like here? And are distances between these spheres the same like here or are they adapted to the planet's size? What do you think?
 
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Lotto said:
What does it mean when a planet have an atmosphere comparable to the Earth?
VERY vague question but the most practical answer is simply "one in which humans can breath normally".
 
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Depends who says it and in what context. Presuming you're talking about exoplanets, it probably means that there's enough oxygen that the lead researcher reckons that bro, you could totally breathe that mix, and knows he's more likely to get more funding for more exoplanet research if he can sell it as earthlike...
 
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A comparison between Earth's atmosphere and that of other planets is usually tied to support for life.
So a planet with something "similar to Earth's" would include parts that are within 0 to 100 Celsius and contain some CO2 and perhaps N2. It could also contain a significant portion of O2, but at that point you would probably find the use of descriptions more exclamatory than "similar to Earth's" - since significant amounts of O2 aren't likely to persist without biological activity.
Nascent Oxygen can be detected in some exoplanets - but that can be from the ionization of H2O or CO2.
Here's an article describing how O2 can be produced from non-biotic chemical reactions.
 
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Related to What is an atmosphere comparable to Earth's atmosphere?

1. What is an atmosphere?

An atmosphere is a layer of gases that surrounds a planet or other celestial body. It is held in place by the planet's gravity and plays a crucial role in supporting life by regulating temperature and protecting against harmful radiation.

2. How is Earth's atmosphere different from other planets?

Earth's atmosphere is unique in that it has the perfect combination of gases to support life. It is composed mostly of nitrogen (78%) and oxygen (21%), with trace amounts of other gases such as carbon dioxide and water vapor. Other planets may have atmospheres, but they may be composed of different gases and have different conditions.

3. What is the composition of Earth's atmosphere?

As mentioned, Earth's atmosphere is mostly made up of nitrogen (78%) and oxygen (21%). The remaining 1% is composed of trace gases such as carbon dioxide, water vapor, and other gases. These gases play important roles in maintaining the balance of our atmosphere and supporting life on Earth.

4. How does Earth's atmosphere protect us?

Earth's atmosphere serves as a protective shield against harmful radiation from the sun. The ozone layer, which is located in the stratosphere, absorbs harmful ultraviolet (UV) radiation, preventing it from reaching the Earth's surface. The atmosphere also helps regulate temperature by trapping heat and preventing extreme temperature fluctuations.

5. Can Earth's atmosphere change?

Yes, Earth's atmosphere is constantly changing due to natural processes and human activities. Natural events such as volcanic eruptions and solar activity can affect the composition and temperature of the atmosphere. Human activities, such as burning fossil fuels, can also contribute to changes in the atmosphere, such as an increase in greenhouse gases and air pollution.

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