What would alien astronomers think of Earth? New study has answers
https://sputniknews.com/20221016/what-would-alien-astronomers-think-of-earth-new-study-has-an-answer-1101890682.html
What would alien astronomers think of Earth? New study has answers
What would alien astronomers think of Earth? New study has answers
Ever wondered how our planet looks for someone? We humans tend to care what others think of us, but this new study Really… 16.10.2022, Sputnik International
2022-10-16T06:18+0000
2022-10-16T06:18+0000
2022-10-16T06:18+0000
Science and technology
earth
space
alien
exoplanet
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If aliens were observing our planet, would they know if there was life there? Scientists have found the answer in a study led by the Physics Department in Zurich. Yes, but there are conditions. According to “Earth as an Exoplanet: II. Earth’s Time-Varying Heat Emission and Atmospheric Seasonality of Biomarkers,” finding evidence of life on Earth would be difficult for hypothetical alien scientists to make observations. Jan Noël Mettler, a doctoral student at the Zurich Department of Physics, and his fellow researchers used infrared emission spectra and , studied the effect of different observation geometries on it. Four different geometries were examined in the study: the north and south poles, the African equator-centered one, and the Pacific equator-centered one. And each perspective yielded different results, leading the scientists to conclude that “there are large seasonal variations in the Earth’s thermal emission spectrum, and the strength of the biosignature absorption feature is highly dependent on both season and viewing geometry.” We conclude that, apart from the seasonal variations that affect observations, it is also about the observation geometry. Variations in measurements appeared to be greater over land than over ocean.Of all the difficulties faced by researchers, one thing we know for sure is that the Earth It is too dynamic to be characterized by a single thermal emission spectrum. For both thermal radiation, multi-epoch measurements are needed.” According to the scientists, there is still much work to be done. The perspectives provided by this study support the fact that it is important to consider various factors when searching for extraterrestrial life.
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Earth, space, aliens, exoplanets
Earth, space, aliens, exoplanets
Ever wondered how our planet looks for someone? We humans tend to care what others think of us, but this new study It’s like looking at the Earth from the other side.
If aliens were watching our planet, would they know if there was life there? In a study led by the Zurich Department of Physics, scientists have found the answer. Yes, but there are conditions.
According to a study titled “Earth as an exoplanet: II.” Finding evidence of life on Earth may depend on the seasons that hypothetical alien scientists choose to make observations, according to “Time-Varying Heat Emissions of the Earth and Atmospheric Seasonality of Biomarkers”. I have.
Jan Noël Mettler, a PhD student at the Zurich Department of Physics, and his fellow researchers study the infrared radiation spectrum and the effects of different observation geometries on it in order to see the planet from the outside. Did.
The study investigated four different geometries centered on the North and South Poles, one centered on the African equator, and one centered on the Pacific equator. And each perspective yielded different results, with scientists concluding that “there are large seasonal variations in the Earth’s thermal emission spectrum, and the strength of the biosignature absorption features is highly dependent on both season and viewing geometry.” attached.
Aside from seasonal variations that affect observations, so is the geometry of observations. Variation in measurements appeared to be greater over land than over sea.
Among the many challenges facing researchers, one thing is certain: the Earth is too dynamic to be characterized by a single thermal emission spectrum.
“Using the Earth as a testbed, we learned that planets and their properties cannot be described by a single thermal emission spectrum, but we need multi-epoch measurements, preferably both reflected light and thermal emission.”
Scientists say there is still much work to be done.
“Future work is needed to investigate how cloud fractions, cloud seasonality, and their thermodynamic phase characteristics affect atmospheric seasonality detection and outcomes.” concludes the article.
The perspectives provided by this study support the fact that it is important to consider various factors when searching for extraterrestrial life.
https://sputniknews.com/20221016/what-would-alien-astronomers-think-of-earth-new-study-has-an-answer-1101890682.html What would alien astronomers think of Earth? New study has answers
