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Breaking News: New research sheds light on the possibility of past life on Venus - News Paper-News of the United States was founded in 1933 by David Lawrence (1888-1973), which also started the World Report in 1946. The two magazines are covering national and international news separately, but Lawrence combines them into news reports of U.S. in World and 1948 [1] and Later sold the magazine to its employees. Historically, this magazine tends to be a bit more conservative than the two main competitors, Time and Newsweek, and focus more on the story of economic, health, and education. It's also distancing news, entertainment and sports celebrities. [2] an important milestone in the history of the beginning of the magazine is including the introduction of the "Washington Whispers" column in 1934 and the column "News You Can Use" in 1952. [3] [4] in 1958, the circulation of the weekly magazine passed one million and two million in 1973. (
wikipedia) Breaking News: New research sheds light on the possibility of past life on Venus - News Paper
While today Venus is a very inhospitable place with surface temperatures hot enough to melt lead, geological evidence, supported by computer model simulations, indicate it may have been much cooler billions of years ago and had an ocean, and so have been very similar to Earth.
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| An artist's impression of Venus [Credit: Blobbie244, CC BY-SA 3.0] |
It is not only the temperature and highly corrosive atmosphere of the present day Venus that makes it different from the Earth. Venus also rotates very slowly, taking 243 Earth days to complete a Venusian day. However, billions of years in the past it may have spun faster, which would have helped make the planet more habitable.
Tides act to brake a planets rotation rate because of friction between the tidal currents and the sea floor. On Earth today, this braking changes the length of a day by about 20 seconds per million years. A new study by Mattias Green at Bangor University's School of Ocean Sciences and colleagues at NASA and University of Washington have quantified this braking effect on ancient Venus.
They show that the tides in a Venusian ocean would have been large enough to slow the rotation rate of Venus by tens of Earth days per million years if Venus were spinning more like Earth does today. This suggests that the tidal brake could have slowed down Venus to its current rotation state in 10-50 million years, and therefore taking it away from being habitable in a short time frame.
Dr. Green says "This work shows how important tides can be to remodel the rotation of a planet, even if that ocean only exists for a few 100 million years, and how key the tides are for making a planet habitable."
Source: Bangor University [May 22, 2019]
from The Archaeology News Network http://bit.ly/2I1OVKH
Breaking News: New research sheds light on the possibility of past life on Venus - News Paper
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