{"id":23415,"date":"2017-11-17T16:12:34","date_gmt":"2017-11-17T15:12:34","guid":{"rendered":"https:\/\/aktuelles.uni-frankfurt.de\/?p=23415"},"modified":"2023-02-23T15:25:13","modified_gmt":"2023-02-23T14:25:13","slug":"interstellar-space-probes-wheres-the-brakes","status":"publish","type":"post","link":"https:\/\/aktuelles.uni-frankfurt.de\/en\/english\/interstellar-space-probes-wheres-the-brakes\/","title":{"rendered":"Interstellar space probes: Where\u2019s the brakes?!"},"content":{"rendered":"<figure class=\"wp-block-image alignleft is-resized wp-image-23261\"><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/11\/beitragsbild_claudius-gros-raumsonde-1.jpg\" alt=\"\" class=\"wp-image-23261\" width=\"393\" height=\"272\" srcset=\"https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/11\/beitragsbild_claudius-gros-raumsonde-1.jpg 650w, https:\/\/aktuelles.uni-frankfurt.de\/wp-content\/uploads\/2017\/11\/beitragsbild_claudius-gros-raumsonde-1-300x208.jpg 300w\" sizes=\"(max-width: 393px) 100vw, 393px\" \/><figcaption class=\"wp-element-caption\">Professor Claudius Gros, Faculty of Physics, Institute for Theoretical Physics<\/figcaption><\/figure>\n\n\n\n<p>With a miniaturised space probe capable of being accelerated to a quarter of the speed of light we could reach Alpha Centauri, our nearest star, in about 20 or up to 50 years. However, without a mechanism to slow it down the space probe could only collect data from the star and its planets as it would zoom past. A theoretical physicist at Goethe University Frankfurt has now examined whether interstellar spacecrafts can be decelerated using \u201cmagnetic sails\u201d.<\/p>\n\n\n\n<p>For a long time, the idea of sending unmanned space probes through the depths of interstellar space to distant stars was purely utopian. Recent research on new concepts &#8211; amongst others within the \u201cBreakthrough Starshot\u201d project \u2013 has shown that miniaturised space probes could be accelerated by means of powerful lasers. Slowing them down again seems more challenging, since they cannot be fitted with braking systems for weight reasons. However, according to Professor Claudius Gros from the Institute for Theoretical Physics at Goethe University Frankfurt, it would be possible to decelerate at least comparatively slow space probes with the help of magnetic sails.<\/p>\n\n\n\n<p>\u201cSlow would mean in this case a travel velocity of 1,000 kilometres per second, which is only 0.3 percent of the speed of light, but nevertheless about 50 times faster than the Voyager spacecraft,\u201d explains Gros. According to Gros\u2019 calculations, we require a magnetic sail in order to transfer the spacecraft\u2019s momentum to the interstellar gas. The sail consists in a large, superconducting loop with a diameter of a about 50 kilometres. A lossless current induced in this loop then creates a strong magnetic field. The ionised hydrogen in the interstellar medium is then reflected off the probe\u2019s magnetic field, slowing it down gradually. This concept works, as Gros was able to show, despite the extremely low particle density of interstellar space (0.005 to 0.1 particles per cubic centimetre).<\/p>\n\n\n\n<p>Gros\u2019 research shows that magnetic sails can decelerate \u2018slow\u2019 spacecrafts weighing up to 1,500 kilograms. However, the journey would take historical periods of time, for example about 12,000 years to reach the seven known planets of the TRAPPIST-1 system. Surprisingly, slower cruising probes of the size of a car could be launched by the same laser which would allow to send, according to current planing, high-speed space probes weighing just a few gram to Alpha Centauri.<\/p>\n\n\n\n<p>Missions to distant stars taking thousands of years are out of the question for exploratory missions. But the situation is quite different in cases where the cruising time is irrelevant, such as missions that open up alternative possibilities for terrestrial life. Such missions, like Gros proposed in 2016 under the name of \u2018The Genesis Project\u2019, would carry single-celled organisms, either as deep-frozen spores or encoded in a miniaturised gene laboratory. For a Genesis probe, it is not the time of arrival which is important, but the possibility to decelerate and then orbit the target planet.<\/p>\n\n\n<p><strong>Publications:<\/strong><\/p>\n<p>Claudius Gros: Universal scaling relation for magnetic sails: momentum braking in the limit of dilute interstellar media, Journal of Physics Communications 1, 045007 (2017);\u00a0<a href=\"http:\/\/iopscience.iop.org\/article\/10.1088\/2399-6528\/aa927e\">http:\/\/iopscience.iop.org\/article\/10.1088\/2399-6528\/aa927e<\/a><\/p>\n<p>Claudius Gros: Developing Ecospheres on Transiently Habitable Planets: The Genesis Project, in: Astrophysics and Space Science 361, 324 (2016); <a href=\"http:\/\/link.springer.com\/article\/10.1007\/s10509-016-2911-0\">http:\/\/link.springer.com\/article\/10.1007\/s10509-016-2911-0<\/a><\/p>\n<p>New Scientist, 13 November 2017: Should we seed life through the cosmos using laser-driven ships?;\u00a0<a href=\"https:\/\/www.newscientist.com\/article\/2153165-should-we-seed-life-through-the-cosmos-using-laser-driven-ships\/\">https:\/\/www.newscientist.com\/article\/2153165-should-we-seed-life-through-the-cosmos-using-laser-driven-ships\/<\/a><\/p>\n\n\n\n<p><em><strong>Source: <a href=\"http:\/\/www.goethe-university-frankfurt.de\/69273499\/035\" target=\"_blank\" rel=\"noopener\">Press Release 17\/11\/17<\/a><\/strong><\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>With a miniaturised space probe capable of being accelerated to a quarter of the speed of light we could reach Alpha Centauri, our nearest star, in about 20 or up [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":23261,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[126,254],"tags":[242],"post_folder":[],"class_list":["post-23415","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-english","category-research","tag-physics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interstellar space probes: Where\u2019s the brakes?! 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