Billions of years ago, Mars had liquid water on its surface. It had oceans, lakes, and rivers. So, how Mars died? How did it lose its atmosphere and water and become the extremely cold, arid desert we know now?
but its reign would have been short: Mars soon lost most of its air and water to space. Scientists are planning the next steps to determine if life ever existed on the now Red Planet.
The original question was how did Mars lose its atmosphere. I think that what happened is likely on the lines of: 1) Less iron on Mars sank to the core. Mars is enriched in surface iron.2) Photo-disassociation of water left Mars oxygen rich.3) This rusted the iron.4) Lightning react...
Russia and Turkey, for example, did not convert to the modern calendar and year scheme until the 20th century. One interesting side note: Because of a variety of changes and adjustments made to the calendar during the middle ages, it turns out that Jesus was most likely born in what we ...
To fully appreciate this complexity, it helps to study the evolution of helicopters through the ages. How exactly did we get from floating, feathered Chinese tops to Black Hawks buzzing in the air? Contents History of the Helicopter: From Feathers to Hoppers ...
The nebula collapsed because of its own gravity and flattened into a spinning disk. Matter was drawn to the center of the disk, forming the sun. You may like What makes Mars the 'Red' Planet? Scientists have some new ideas How did Earth get such a strange moon? Exploring the giant...
81. When did he plant the apple tree? 82. Where did Smith plant the apple tree in the end? 83. Why did the apple tree soon die? 84. What would probably happen if the farmer had planted the tree near his house? ...
and the seal can go back into water a day or two after its operation. So Myria was a very specific case. She'd been confiscated from a farmer because she'd been raiding his fruit trees and he put her in a wooden crate and kept her like that for two years. ...
One of the biggest, according to Mark Blanton, who leads NASA's Moon to Mars mission analysis and integrated assessments, is the purpose of the mission. RELATED MYSTERIES —Why can't we see the far side of the moon? —Will Earth ever lose its moon? —Why can we sometimes see the ...
提示问题: What did you do to strive for your goal? What have you learned from your experience? It's well-known that there's no shortcut to success but hard work. One of my experiences helps me realize the truth again. As I entered Grad...