{"id":10987,"date":"2025-02-04T21:13:54","date_gmt":"2025-02-04T19:13:54","guid":{"rendered":"https:\/\/uni-mag.gr\/?p=10987"},"modified":"2025-02-15T12:14:16","modified_gmt":"2025-02-15T10:14:16","slug":"what-are-they-interacting-spiral-galaxies","status":"publish","type":"post","link":"https:\/\/www.uni-mag.gr\/en\/what-are-they-interacting-spiral-galaxies\/","title":{"rendered":"What are they? Interacting Spiral Galaxies"},"content":{"rendered":"\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1004\" height=\"666\" src=\"https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-NAS_GAL2.gif\" alt=\"\" class=\"wp-image-10906\"\/><figcaption class=\"wp-element-caption\"><em>Chronological sequence of the close interaction between two spiral galaxies (from top left to bottom right).<\/em><\/figcaption><\/figure>\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">Initially, the two galaxies approach each other. After the collision, both become distorted. Tidal tails begin to form and will continue to adorn the remnants of the collision for a long time after the initial impact (as seen in the last three images of the sequence).   <\/p>\n\n<p class=\"wp-block-paragraph\">\u2013 Good evening. What\u2019s your name? My name is NGC 5257.  <\/p>\n\n<p class=\"wp-block-paragraph\">Usually, for two strangers to start a conversation, someone has to introduce them first. Otherwise, it\u2019s considered completely &#8220;improper&#8221; for them to talk to each other. <\/p>\n\n<p class=\"wp-block-paragraph\">\u2013 This is Mr. X.<\/p>\n\n<p class=\"wp-block-paragraph\">\u2013 This is Ms. Y.<\/p>\n\n<p class=\"wp-block-paragraph\">Only then do they start talking. They begin to dance around each other. Now, it\u2019s no longer &#8220;improper.&#8221;  <br\/>So, is it considered &#8220;proper&#8221; for one galaxy to spin around another without speaking? But who made these rules?<br\/>Who asked the two galaxies if they wanted to be so close together?<br\/>Gravity doesn\u2019t ask anyone.<br\/>Do you think Newton was asked whether he wanted the apple to fall on his head? Of course not. The apple simply ripened, and it was time for it to detach from the tree. It detached. Then gravity took over\u2014without asking anyone.<br\/>And so, the fallen apple began its journey toward the center of the Earth. Unfortunately, Newton\u2019s head just happened to be in its way.       <\/p>\n\n<p class=\"wp-block-paragraph\">With humans, it\u2019s different. One asks the other: &#8220;Will you marry me?&#8221;<br\/>If they get married, only then do they begin their wild dance!<br\/>Meanwhile, galaxies start their wild dance around each other without many questions, demands, conditions, or dreams for the future. And whatever happens is simply welcomed.<br\/>Will new stars form in the compressed interstellar gas of the galaxies? They will be gladly welcomed.<br\/>Will black holes form at the centers of the galaxies involved in the cosmic dance? They, too, will be welcomed.<br\/>Or maybe neither will happen. That possibility will also be welcomed.        <br\/>But NGC 5257 and NGC 5258 dance beautifully!<br\/>Is this mesmerizing dance also a result of gravity? <\/p>\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"NASA supercomputer simulation of colliding galaxies\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/FMPuujaldZk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\">At first, one galaxy approaches the other, both filled with an infinite desire for connection and unity. They collide, and a very warm, red region forms between them. <br\/>Then, one begins to tear the other apart. Oh, what\u2019s happening here? One raises its arms in despair. The other does the same. Matter flows between them. <br\/>A powerful wind carries away material from both galaxies. <br\/>In the end, their centers merge into one. <br\/>And so, a single remnant is born from the union of two galaxies.         <br\/><br\/>Does NGC 5257 enjoy the dance at all?<br\/>What about NGC 5258? <br\/><br\/>Or am I the only one enjoying watching them spin and devour each other?<br\/>Cannibals!<br\/>This is called galactic cannibalism\u2014one galaxy consuming the other.<br\/>And yet, at the beginning of their dance, they seemed to truly love each other, as if neither wanted to harm the other.<br\/>But does the fact that they consumed each other mean they didn\u2019t love one another?<br\/>Or\u2026 does it mean the exact opposite?      <\/p>\n\n<p class=\"wp-block-paragraph\"><em><strong>NOTES<\/strong><\/em><br\/>An example of interacting galaxies: NGC 5257 and NGC 5258.<\/p>\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-1024x1024.jpg\" alt=\"\" class=\"wp-image-10910\" srcset=\"https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-1024x1024.jpg 1024w, https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-300x300.jpg 300w, https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-150x150.jpg 150w, https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-768x768.jpg 768w, https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at-200x200.jpg 200w, https:\/\/www.uni-mag.gr\/wp-content\/uploads\/2025\/02\/issue-11-heic0810at.jpg 1280w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p class=\"card-text\">While galaxies begin a wild dance around each other\u2014without many questions, demands, conditions, or dreams for the future.  [&#8230;]<\/p>\n<p class=\"m-0\"><a class=\"btn btn-outline-secondary btn-read-more\" href=\"https:\/\/www.uni-mag.gr\/en\/what-are-they-interacting-spiral-galaxies\/\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":10916,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2527,139,393],"tags":[2604,1914,2594,2602,2603],"class_list":["post-10987","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-issue-11-en","category-issues-en","category-what-is-en","tag-5258-en","tag-astronomy-en","tag-galaxies","tag-interacting-spiral-galaxies","tag-ngc-5257-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What are they? 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