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The Solar Wind Scavenging
The Earth has a magnetic field and so do several other planets in the solar system. But un-magnetized objects are not protected magnetically from the solar wind. So you have this wonderful process called Solar Wind Scavenging, which really takes atmospheres away. We think that about 3.8 billion years ago, Mars used to have an atmosphere which is about the same as the Earth's now. That has been pulled away over time because Mars lost its magnetic field.