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Tuesday, March 6, 2012

Lifeless Venus

Posted by on Tue, Mar 6, 2012 at 7:45 AM

Science Daily:

In the grand scheme of the solar system, Venus and Earth are almost the same distance from the sun. Yet the planets differ dramatically: Venus is some 100 times hotter than Earth and its days more than 200 times longer. The atmosphere on Venus is so thick that the longest any spacecraft has survived on its surface before being crushed is a little over two hours. There's another difference, too. Earth has a magnetic field and Venus does not — a crucial distinction when assessing the effects of the sun on each planet.

As the solar wind rushes outward from the sun at nearly a million miles per hour, it is stopped about 44,000 miles away from Earth when it collides with the giant magnetic envelope that surrounds the planet called the magnetosphere. Most of the solar wind flows around the magnetosphere, but in certain circumstances it can enter the magnetosphere to create a variety of dynamic space weather effects on Earth. Venus has no such protective shield, but it is still an immovable rock surrounded by an atmosphere that disrupts and interacts with the solar wind, causing interesting space weather effects.

Earth is always the perfect place for life. And without life, the beauty of a planet seems so alien, so uninviting.
Venus.jpeg
  • NASA
We, like Venus, are made from the stuff of stars; but Venus and the rest of the universe we know about does not behave like us and our home, the vibrant biosphere.

 

Comments (2) RSS

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Fifty-Two-Eighty 1
Damned global warming.
Posted by Fifty-Two-Eighty http://www.nra.org on March 6, 2012 at 8:48 AM · Report this
2
WE ARE ALL SPACE HICKS
Posted by mai naim hear on March 6, 2012 at 9:21 AM · Report this

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