{"id":14580,"date":"2025-05-26T22:00:00","date_gmt":"2025-05-26T22:00:00","guid":{"rendered":"https:\/\/modernsciences.org\/staging\/4414\/?p=14580"},"modified":"2025-05-23T02:51:31","modified_gmt":"2025-05-23T02:51:31","slug":"jupiter-early-size-evolution-may-2025","status":"publish","type":"post","link":"https:\/\/modernsciences.org\/staging\/4414\/jupiter-early-size-evolution-may-2025\/","title":{"rendered":"Jupiter Was Twice as Large in Its Early Days, New Study Finds"},"content":{"rendered":"\n<div class=\"wp-block-group has-gray-200-background-color has-background\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-block-group-is-layout-constrained\">\n<h1 id=\"at-a-glance\" class=\"wp-block-heading\">At a Glance<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Jupiter\u2019s immense early gravity shaped the Solar System\u2019s structure by influencing planetary orbits and organizing the protoplanetary disk from which planets formed.<\/li>\n\n\n\n<li class=\"\">Based on the tilted orbits of its inner moons, Amalthea and Thebe researchers found that early Jupiter had a radius twice its current size and a magnetic field 50 times stronger.<\/li>\n\n\n\n<li class=\"\">The study used observable data from moon dynamics and angular momentum instead of uncertain assumptions to estimate Jupiter\u2019s characteristics around 3.8 million years after forming solid bodies.<\/li>\n\n\n\n<li class=\"\">These findings support and refine the core accretion model of planet formation, providing new details about how gas giants like Jupiter grow from rocky cores.<\/li>\n\n\n\n<li class=\"\">Understanding Jupiter\u2019s early evolution helps scientists study planetary development across the Solar System and informs theories about how other planetary systems might have formed.<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Jupiter\u2019s early years played a crucial role in shaping the structure of our entire Solar System. Known as the \u201carchitect\u201d of the Solar System, Jupiter\u2019s immense gravity influenced the orbits of other planets and helped define the disk of gas and dust from which they formed. While scientists have long been interested in understanding Jupiter\u2019s formation, a new study offers a clearer picture of the planet\u2019s early size and characteristics. This research, published in <a href=\"https:\/\/www.nature.com\/articles\/s41550-025-02512-y\" target=\"_blank\" rel=\"noreferrer noopener\"><em>Nature Astronomy<\/em><\/a>, sheds light on Jupiter\u2019s size, magnetic field, and other properties shortly after the Solar System began to form.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\" pk-lazyload\"  data-pk-sizes=\"auto\"  data-pk-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/jupiter-was-formerly-t.jpg\" ><figcaption class=\"wp-element-caption\">(Batygin, 2025)<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Led by <a href=\"https:\/\/www.konstantinbatygin.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Konstantin Batygin<\/a>, a professor of planetary science at <a href=\"https:\/\/www.caltech.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">Caltech<\/a>, and <a href=\"https:\/\/lsa.umich.edu\/physics\/people\/faculty\/fca.html\" target=\"_blank\" rel=\"noreferrer noopener\">Fred C. Adams<\/a>, a professor at the <a href=\"https:\/\/umich.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">University of Michigan<\/a>, the study focused on Jupiter\u2019s moons Amalthea and Thebe, which orbit closer to the planet than its famous Galilean moons. By studying these moons\u2019 slightly tilted orbits, the team calculated that Jupiter\u2019s radius was about twice as large as it is today. This suggests that in its early days, Jupiter was much bigger and had a volume equivalent to over 2,000 Earths. The study also found that Jupiter\u2019s magnetic field was 50 times stronger than it is now.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\" pk-lazyload\"  data-pk-sizes=\"auto\"  data-pk-src=\"https:\/\/live.staticflickr.com\/65535\/51713607172_8dbd0b08e2_b.jpg\" ><figcaption class=\"wp-element-caption\">\u201c<a href=\"https:\/\/www.flickr.com\/photos\/53460575@N03\/51713607172\" target=\"_blank\" rel=\"noreferrer noopener\">Jupiter \u2013 November 29 2021<\/a>\u201d by\u00a0<a href=\"https:\/\/www.flickr.com\/photos\/53460575@N03\" target=\"_blank\" rel=\"noreferrer noopener\">Kevin M. Gill<\/a>\u00a0is licensed under\u00a0<a href=\"https:\/\/creativecommons.org\/licenses\/by\/2.0\/?ref=openverse\" target=\"_blank\" rel=\"noreferrer noopener\">CC BY 2.0<\/a>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">These new findings come from analyzing the dynamics of Jupiter\u2019s moons and their angular momentum. Unlike previous studies that relied on uncertain assumptions, such as the rate of gas accumulation or the opacity of gas in Jupiter\u2019s early atmosphere, Batygin and Adams used measurable data from the moons\u2019 orbits to understand the planet\u2019s early conditions. Their results suggest that the gas giant\u2019s size and strength were significantly greater when the Solar System\u2019s protoplanetary nebula\u2014the disk of gas and dust around the Sun\u2014dissipated about 3.8 million years after the first solid objects in the Solar System formed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img  decoding=\"async\"  src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAAP+KeNJXAAAAAXRSTlMAQObYZgAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII=\"  alt=\"\"  class=\" pk-lazyload\"  data-pk-sizes=\"auto\"  data-pk-src=\"https:\/\/live.staticflickr.com\/958\/42240352032_ec5a5b9262_h.jpg\" ><figcaption class=\"wp-element-caption\">\u201c<a href=\"https:\/\/www.flickr.com\/photos\/51027818@N05\/42240352032\" target=\"_blank\" rel=\"noreferrer noopener\">Europa and Jupiter\u2019s Great Red Spot<\/a>\u201d by\u00a0<a href=\"https:\/\/www.flickr.com\/photos\/51027818@N05\" target=\"_blank\" rel=\"noreferrer noopener\">Lights In The Dark<\/a>\u00a0is licensed under\u00a0<a href=\"https:\/\/creativecommons.org\/licenses\/by-nc-sa\/2.0\/?ref=openverse\" target=\"_blank\" rel=\"noreferrer noopener\">CC BY-NC-SA 2.0<\/a>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The researchers\u2019 work builds upon the core accretion model, which explains how giant planets like Jupiter form from a rocky and icy core that quickly gathers gas. This new research refines our understanding of how Jupiter developed and gives scientists a clearer benchmark for studying the evolution of other planets in the Solar System. By enhancing our knowledge of Jupiter\u2019s early years, this study brings us closer to answering fundamental questions about how the Solar System and other planetary systems formed.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 id=\"references\" class=\"wp-block-heading\">References<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"\">Dajose, L. & California Institute of Technology. (2025, May 20). <em>Jupiter was formerly twice its current size and had a much stronger magnetic field, study says<\/em>. Phys.Org; California Institute of Technology. <a href=\"https:\/\/phys.org\/news\/2025-05-jupiter-current-size-stronger-magnetic.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/phys.org\/news\/2025-05-jupiter-current-size-stronger-magnetic.html<\/a><\/li>\n\n\n\n<li class=\"\">Batygin, K., & Adams, F. C. (2025). Determination of Jupiter\u2019s primordial physical state. <em>Nature Astronomy<\/em>, 1\u201310. <a href=\"https:\/\/doi.org\/10.1038\/s41550-025-02512-y\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1038\/s41550-025-02512-y<\/a><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"Jupiter may have once been twice its current size, with findings from its inner moons revealing a giant planet that shaped the early Solar System more dramatically than previously thought.\n","protected":false},"author":2,"featured_media":14582,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","fifu_image_url":"https:\/\/scx2.b-cdn.net\/gfx\/news\/hires\/2025\/jupiter-was-formerly-t.jpg","fifu_image_alt":"","footnotes":""},"categories":[14],"tags":[10664,10659,10658,10668,10661,10665,10675,10669,10656,10672,10666,10662,10657,10673,10674,10660,10670,10667,10671,10663],"class_list":["post-14580","post","type-post","status-publish","format-standard","has-post-thumbnail","category-space","tag-amalthea-thebe-tilted-orbits","tag-batygin-adams-jupiter-study","tag-early-jupiter-size-evolution","tag-early-planetary-magnetic-fields","tag-early-solar-system-gas-giants","tag-gas-giant-planet-development","tag-giant-planet-formation-benchmark","tag-jupiter-angular-momentum-dynamics","tag-jupiter-formation-core-accretion-model","tag-jupiter-magnetic-field-strength","tag-jupiter-mass-and-volume-history","tag-jupiter-moon-orbit-analysis","tag-jupiter-moon-orbital-tilt","tag-jupiter-planetary-system-architecture","tag-jupiter-protoplanetary-disk-influence","tag-jupiter-radius-early-solar-system","tag-jupiter-twice-as-large-study","tag-nature-astronomy-jupiter-research","tag-protoplanetary-nebula-jupiter-growth","tag-solar-system-formation-timeline","cs-entry","cs-video-wrap"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/14580","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/comments?post=14580"}],"version-history":[{"count":1,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/14580\/revisions"}],"predecessor-version":[{"id":14581,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/14580\/revisions\/14581"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/media\/14582"}],"wp:attachment":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/media?parent=14580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/categories?post=14580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/tags?post=14580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}