Mars's atmosphere is strongly affected by the solar wind.

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Mars has a very thin atmosphere, which makes it more vulnerable to the solar wind. The solar wind can strip away some of Mars's atmosphere, forming a tail-like feature called the ionosphere. It can also affect the planet's magnetic field and cause auroras. Mars's atmosphere is not protected by a strong magnetic field like Earth's, so it is more vulnerable to the solar wind, which carries charged particles that can strip away gases from the planet's atmosphere. This has been observed by NASA's MAVEN spacecraft, which has found evidence of atmospheric loss due to interaction with the solar wind.

Mars's Atmosphere Is Strongly Affected by the Solar Wind