Archiv: Venus (planet)


15.09.2020 - 16:30 [ University of North Carolina at Charlotte ]

Solar Rotation Effects on The Thermospheres of Mars and Earth

(spring 2006)

The first thing that must be understood in this paper is the chain of events that is being tracked. From the Sun‘s rotational quirks, to their effects on CO2 in the respective atmospheres of Mars and Earth. There is also a comparison to older, normalized data from Venus.

(…)

Interestingly, once the data was compiled, there was no correlation found between the levels of CO2 found in the upper atmosphere (~150km on Earth, where this transformation takes place.) Broadening their search, the authors found a strong correlation between the ratio of CO2/O2 and the thermal changes. They feel this suggests that the thermal diffusion effect relies on some form of resonance between the two molecules involved

15.09.2020 - 12:40 [ Frankfurter Allgemeine Zeitung ]

Zum Venustransit: Leben in Säurewolken?

(07.06.2004)

Andere Astrobiologen haben dagegen noch grundsätzlichere Bedenken. Wenn es die venerischen Luftbazillen wirklich gäbe, so ihr Einwand, hätten sie oder ihre Stoffwechselprodukte in den Meßdaten der Venussonden schon lange auffallen müssen. „Wo Leben existieren kann, neigt es zu Dominanz“, sagt etwa der Nasa-Astrobiologe Chris McKay. „Wenn ich aus meinem Fenster blicke, sehe ich überall Grün – warum, bitte, sind die Venuswolken nicht grün?“

15.09.2020 - 12:32 [ BBC ]

Venus clouds ‚might harbour life‘

(25.05.2004)

„Current theories suggest that Venus and the Earth may have started out alike. There might have been a lot of water on Venus and there might have been a lot of carbon dioxide on Earth,“ Professor Ingersoll explained.

But all that was to change. On Earth, life in the oceans took in carbon dioxide and turned it into limestone. On Venus, 30% closer to the Sun, any oceans boiled away and the water vapour added to the runaway greenhouse effect.

15.09.2020 - 11:57 [ Harold Morowitz and Carl Sagan / Nature.com ]

Life in the Clouds of Venus?

(16.09.1967)

WHILE the surface conditions of Venus make the hypothesis of life there implausible, the clouds of Venus are a different story altogether. As was pointed out some years ago, water, carbon dioxide and sunlight—the prerequisites for photosynthesis—are plentiful in the vicinity of the clouds. Since then, good additional evidence has been provided that the clouds are composed of ice crystals at their tops and it seems likely that there are water droplets toward their bottoms. Independent evidence for water vapour also exists5.

15.09.2020 - 11:56 [ ScienceDirect.com ]

Water vapor in the atmosphere of Venus

(December 1972)

Infrared spectra of Venus produced by a Fourier spectrometer flown aboard the NASA CV 990 jet aircraft were analyzed for water-vapor content by comparison with calculated model spectra. The reflecting layer model gave an abundance of 1.6 ± 0.4 μ of precipitable water for the two-way transmission of the Venus atmosphere. The scattering model resulted in a value of 0.25 ± 0.10 μ of water per scattering mean free path.

15.09.2020 - 11:53 [ New York Times ]

Life on Venus? Astronomers See a Signal in Its Clouds

(14.09.2020)

“This is an astonishing and ‘out of the blue’ finding,” said Sara Seager, a planetary scientist at the Massachusetts Institute of Technology and an author of the papers (one published in Nature Astronomy and another submitted to the journal Astrobiology). “It will definitely fuel more research into the possibilities for life in Venus’s atmosphere.”

15.09.2020 - 11:31 [ Nature.com ]

Phosphine gas in the cloud decks of Venus

(14.09.2020)

Here we report the apparent presence of phosphine (PH3) gas in Venus’s atmosphere, where any phosphorus should be in oxidized forms. Single-line millimetre-waveband spectral detections (quality up to ~15σ) from the JCMT and ALMA telescopes have no other plausible identification.

02.01.2020 - 13:20 [ ScienceMag.org ]

Magnetic Reconnection in the Near Venusian Magnetotail

(04.05.2012)

Observations with the Venus Express magnetometer and low-energy particle detector revealed magnetic field and plasma behavior in the near-Venus wake that is symptomatic of magnetic reconnection, a process that occurs in Earth’s magnetotail but is not expected in the magnetotail of a nonmagnetized planet such as Venus.

25.09.2019 - 19:23 [ Phys.org ]

Strong planetary magnetic fields like Earth‘s may protect oceans from stellar storms

(14.03.2019)

„Magnetic fields appear to play an essential role in making planets habitable, so I wanted to find out how Earth‘s magnetic field compared to those of other potentially habitable planets,“ she said.

Ms McIntyre said Earth‘s strong magnetic field had probably played an important role in protecting the atmosphere from the solar wind and keeping the planet wet and habitable.

„Venus and Mars have negligible magnetic fields and do not support life, while Earth‘s magnetic field is relatively strong and does,“ she said.

25.09.2019 - 18:56 [ National Aeronautics and Space Administration ]

Why doesn‘t Venus have a magnetic field ?

Current theories of the formation and evolution of the terrestrial planets do support an Earth scale magnetic dipole (magnetic field) on Venus for perhaps the first billion years or so after formation.

25.09.2019 - 18:47 [ European Planetary Science Congress / American Astronomical Society's Division for Planetary Sciences ]

A view to the possible habitability of ancient Venus over three billion years

(20.09.2019)

The long-term evolutionary history of Venus’ climate largely remains a mystery.

05.06.2019 - 20:27 [ ScienceMag.org ]

Magnetic Reconnection in the Near Venusian Magnetotail

(04.05.2012)

Observations with the Venus Express magnetometer and low-energy particle detector revealed magnetic field and plasma behavior in the near-Venus wake that is symptomatic of magnetic reconnection, a process that occurs in Earth’s magnetotail but is not expected in the magnetotail of a nonmagnetized planet such as Venus.