{"id":8137,"date":"2024-09-06T09:00:24","date_gmt":"2024-09-06T13:00:24","guid":{"rendered":"https:\/\/dailygalaxy.com\/?p=8137"},"modified":"2024-09-06T09:00:24","modified_gmt":"2024-09-06T13:00:24","slug":"mars-water-nasa-hubble-maven-solve-mystery","status":"publish","type":"post","link":"https:\/\/dailygalaxy.com\/2024\/09\/mars-water-nasa-hubble-maven-solve-mystery\/","title":{"rendered":"How Mars Lost Its Water: NASA\u2019s Hubble and MAVEN Solve Long-Standing Mystery"},"content":{"rendered":"<p><strong>NASA\u2019s Hubble Space Telescope and the Mars Atmosphere and Volatile Evolution (MAVEN) mission have worked together to unravel one of the biggest mysteries surrounding Mars: what happened to its water? Mars, once a planet rich in surface water, has gradually lost most of it over the past 3 billion years.<\/strong><\/p>\n<h2>The Process Behind Mars\u2019 Water Loss<\/h2>\n<p>The study reveals that water molecules in the Martian atmosphere are broken down by sunlight into their atomic components\u2014<strong>hydrogen and oxygen<\/strong>. Of particular interest to researchers is hydrogen and its heavier isotope, <strong>deuterium<\/strong>. Deuterium is hydrogen with an extra neutron in its nucleus, making it heavier and less likely to escape into space compared to regular hydrogen. Over time, as <a href=\"https:\/\/dailygalaxy.com\/?s=Mars\">Mars<\/a> lost hydrogen at a faster rate than deuterium, the ratio between these two isotopes increased, providing scientists with a method to estimate how much water Mars used to have during its wetter periods.<\/p>\n<p>\"There are only two places water can go. It can freeze into the ground, or the water molecule can break into atoms, and the atoms can escape from the top of the atmosphere into space,\" explained <strong>John Clarke<\/strong>, lead researcher from <strong>Boston University\u2019s Center for Space Physics<\/strong>. By using data from Hubble and MAVEN, Clarke and his team were able to measure the current escape rate of hydrogen atoms and extrapolate that information to understand the long-term history of water on Mars. This process helps scientists trace the fate of Mars' water over billions of years and offers new clues about the Red Planet\u2019s ancient climate.<\/p>\n<p><iframe loading=\"lazy\" title=\"YouTube video player\" src=\"https:\/\/www.youtube.com\/embed\/BxHLF1-U5nI?si=WXeDg8dS0kC5c8wj\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<h2>Hubble and MAVEN Reveal a Dynamic Martian Atmosphere<\/h2>\n<p>One of the most striking discoveries made by the Hubble and <a href=\"https:\/\/science.nasa.gov\/mission\/maven\/\" target=\"_blank\" rel=\"noopener\">MAVEN<\/a> missions is that the <strong>Martian atmosphere<\/strong> is much more dynamic than previously thought. Mars\u2019 elliptical orbit brings it closer to the Sun during certain parts of its year, causing rapid changes in the atmosphere. When Mars is near its closest point to the Sun, known as <strong>perihelion<\/strong>, the planet\u2019s atmosphere heats up, and water molecules rise through it more quickly. These molecules are broken apart at higher altitudes, releasing hydrogen and oxygen atoms into space at a faster rate.<\/p>\n<p>\"Scientists have found that Mars has an annual cycle that is much more dynamic than people expected 10 or 15 years ago,\" Clarke explained. \"The whole atmosphere is very turbulent, heating up and cooling down on short timescales, even down to hours.\" The discovery that atmospheric conditions on Mars can change so rapidly, expanding and contracting based on the planet\u2019s position relative to the Sun, adds a new layer of complexity to understanding how Mars has lost its water over time.<\/p>\n<p>Hubble\u2019s far-ultraviolet imaging, combined with MAVEN\u2019s atmospheric data, has allowed scientists to map these changes in unprecedented detail. When Mars is farthest from the Sun, or at <strong>aphelion<\/strong>, hydrogen escape slows down, but at perihelion, the rate increases significantly. These findings overturn earlier assumptions that hydrogen atoms slowly diffused upwards through the atmosphere. Instead, the water molecules are pushed to higher altitudes rapidly when Mars is closest to the Sun, accelerating the process of water loss.<\/p>\n<h2>The Role of Solar Wind and Chemical Reactions<\/h2>\n<p>The study also revealed that additional energy sources are required to explain how hydrogen and deuterium atoms reach escape velocity. At the temperatures found in Mars\u2019 upper atmosphere, only a small fraction of hydrogen atoms would have the necessary speed to escape Mars' gravity. To account for this, scientists identified two key factors that provide the extra \"kick\" needed for these atoms to escape: <strong>solar wind<\/strong> collisions and <strong>sunlight-driven chemical reactions<\/strong> in the upper atmosphere.<\/p>\n<p>Solar wind particles, which continuously stream from the Sun, collide with atmospheric particles, transferring energy and boosting the speed of hydrogen atoms. At the same time, <strong>solar radiation<\/strong> triggers chemical reactions that produce super-thermal hydrogen atoms\u2014atoms moving fast enough to escape Mars\u2019 gravitational pull. These mechanisms have contributed to the accelerated loss of Mars\u2019 atmosphere, particularly during periods of high solar activity. The interaction between the solar wind and Mars' atmosphere further emphasizes how the planet's distance from the Sun affects its ability to retain water.<\/p>\n<h2>Understanding Mars as a Proxy for Distant Exoplanets<\/h2>\n<p>Beyond solving the mystery of Mars\u2019 water loss, these findings have broader implications for understanding the evolution of planets both inside and outside our solar system. Mars, Earth, and Venus all reside within or near the <strong>habitable zone<\/strong> of the Sun, the region where conditions could potentially support liquid water. However, the present-day environments of these planets are drastically different. While Earth remains rich in water, Venus has undergone a runaway greenhouse effect, and Mars has lost much of its atmosphere and water over time.<\/p>\n<p>\"Studying the history of water on Mars is fundamental not only to understanding planets in our own solar system but also the evolution of Earth-size planets around other stars,\" Clarke pointed out. Astronomers are finding more <strong>exoplanets<\/strong> within the habitable zones of distant stars, but it is difficult to study them in detail. Mars serves as a valuable proxy for these distant worlds, offering clues about how planets lose their atmospheres and water over billions of years.<\/p>\n<p>The collaboration between Hubble and MAVEN provided the first <strong>holistic view<\/strong> of hydrogen atoms escaping Mars, helping scientists piece together the planet\u2019s water history and offering a framework for studying other rocky planets in similar orbits around distant stars.<\/p>\n<h2>Looking Forward: The Future of Mars Exploration<\/h2>\n<p>As the <strong>MAVEN mission<\/strong> prepares to celebrate its <strong>10th year<\/strong> at Mars in September 2024, scientists continue to gather data that will enhance our understanding of the Red Planet. The mission, which is managed by <strong>NASA\u2019s Goddard Space Flight Center<\/strong>, has played a crucial role in explaining how the Martian atmosphere behaves and how water escapes into space. Meanwhile, the <strong>Hubble Space Telescope<\/strong>, which has been in operation for more than three decades, continues to provide key observations that help solve long-standing questions about the universe, including planetary evolution and atmospheric processes.<\/p>\n<p>Together, these missions are providing a clearer picture of Mars\u2019 past and present, offering insights into the planet's potential to host life billions of years ago. With further research, scientists hope to unlock more secrets about the planet's geological history and its capacity to support life. As <strong>John Clarke<\/strong> summarized, \"To understand how much water there was and what happened to it, we need to understand how the atoms escape into space.\" This ongoing research will undoubtedly shape future Mars exploration missions and enhance our understanding of the solar system\u2019s most enigmatic planet.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NASA\u2019s Hubble Space Telescope and the Mars Atmosphere and Volatile Evolution (MAVEN) mission have worked together to unravel one of the biggest mysteries surrounding Mars: what happened to its water?&#8230;<\/p>\n","protected":false},"author":4,"featured_media":8139,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[1,140,170,137],"tags":[222,141],"class_list":["post-8137","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-nasa","category-physics","category-science","tag-mars","tag-nasa"],"_links":{"self":[{"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/posts\/8137"}],"collection":[{"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/comments?post=8137"}],"version-history":[{"count":2,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/posts\/8137\/revisions"}],"predecessor-version":[{"id":8141,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/posts\/8137\/revisions\/8141"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/media\/8139"}],"wp:attachment":[{"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/media?parent=8137"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/categories?post=8137"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dailygalaxy.com\/wp-json\/wp\/v2\/tags?post=8137"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}