{"id":4416,"date":"2022-07-06T10:00:00","date_gmt":"2022-07-06T10:00:00","guid":{"rendered":"https:\/\/modernsciences.org\/staging\/4414\/?p=4416"},"modified":"2022-06-20T06:06:07","modified_gmt":"2022-06-20T06:06:07","slug":"did-a-giant-radio-telescope-in-china-just-discover-aliens-not-so-fast","status":"publish","type":"post","link":"https:\/\/modernsciences.org\/staging\/4414\/did-a-giant-radio-telescope-in-china-just-discover-aliens-not-so-fast\/","title":{"rendered":"Did a giant radio telescope in China just discover aliens? Not so FAST\u2026"},"content":{"rendered":"\nDanny C Price<\/a>, Curtin University<\/a><\/em><\/span>\n\n
\n

\u201cExtraordinary claims require extraordinary evidence.\u201d
\n \u2013 Carl Sagan (Cosmos, 1980)<\/cite><\/p>\n<\/blockquote>\n\n

This phrase is the standard<\/a> that astronomers will be applying to a curious signal captured with China\u2019s \u201cSky Eye\u201d telescope that might<\/em> be a transmission from alien technology. <\/p>\n\n

An article reporting the signal was posted on the website of China\u2019s state-backed Science and Technology Daily newspaper, but was later removed.<\/a> So have astronomers finally found evidence of intelligent found life beyond Earth? And is it being hushed up?<\/p>\n\n

We should be intrigued, but not too excited (yet). An interesting signal has to go through a lot of tests to check whether it truly carries the signature of extraterrestrial technology or is just the result of an unexpected source of terrestrial interference. <\/p>\n\n

And as for the deletion: media releases are normally timed for simultaneous release with peer-reviewed results \u2013 which are not yet available \u2013 so it was likely just released a bit early by mistake. <\/p>\n\n

An eye on the sky<\/h2>\n\n

Sky Eye, which is offically known as the Five-hundred-meter Aperture Spherical Telescope (FAST)<\/a>, is the the largest and most sensitive single-dish radio telescope in the world. A engineering marvel, its gargantuan structure is built inside a natural basin in the mountains of Guizhou, China<\/a>. <\/p>\n\n

The telescope is so huge it can\u2019t be physically tilted, but it can be pointed in a direction by thousands of actuators that deform the telescope\u2019s reflective surface. By deforming the surface, the location of the telescope\u2019s focal point changes, and the telescope can look at a different part of the sky.<\/p>\n\n\n\n

FAST detects radiation at radio wavelengths (up to 10 cm) and is used for astronomical research in a wide range of areas. One area is the search for extraterrestrial intelligence, or SETI. <\/p>\n\n

SETI observations are mainly done in \u201cpiggy-back\u201d mode, which means they are taken while the telescope is also running its primary science programs. In this way, large swaths of the sky can be scanned for signs of alien technology \u2013 or \u201ctechnosignatures\u201d \u2013 without getting in the way of other science operations. For special targets like nearby exoplanets, dedicated SETI observations are still carried out.<\/p>\n\n

The hunt for alien technology<\/h2>\n\n

Technosignature searches have been ongoing since the 1960s, when the American astronomer Frank Drake<\/a> pointed the 26-metre Tatel telescope<\/a> toward two nearby Sun-like stars and scanned them for signs of technology. <\/p>\n\n

Over the years, technosignature searches have become far more rigorous and sensitive. The systems in place at FAST are also able to process billions of times more of the radio spectrum than Drake\u2019s experiment. <\/p>\n\n

Despite these advances, we haven\u2019t yet found any evidence of life beyond Earth.<\/p>\n\n

FAST sifts through enormous amounts of data. The telescope feeds 38 billion samples a second into a cluster of high-performance computers, which then produces exquisitely detailed charts of incoming radio signals. These charts are then searched for signals that look like technosignatures. <\/p>\n\n

With such a large collecting area, FAST can pick up incredibly faint signals. It is about 20 times more sensitive than Australia\u2019s Murriyang telescope at the Parkes Radio Observatory. FAST could easily detect a transmitter on a nearby exoplanet with a similar output power to radar systems we have here on Earth. <\/p>\n\n\n\n

The trouble with sensitivity<\/h2>\n\n

The trouble with being so sensitive is that you can uncover radio interference that would otherwise be too faint to detect. We SETI researchers have had this problem before. <\/p>\n\n

Last year, using Murriyang, we detected an extremely interesting signal we called BLC1<\/a>. <\/p>\n\n

However, it turned out to be very strange interference (not aliens). To uncover its true nature, we had to develop a new verification framework<\/a>. <\/p>\n\n

\n \"Technosignature<\/a>\n
\n A flowchart for verifying candidate technosignatures, developed for BLC1.<\/span>\n Sofia Sheikh (SETI Institute)<\/span><\/span>\n <\/figcaption>\n <\/figure>\n\n

With BLC1, it took about a year from when it was initially reported to when peer-reviewed analysis was published. Similarly, we may need to wait a while for the FAST signal to be analysed in depth. <\/p>\n\n

Professor Zhang Tongjie, chief scientist for the China Extraterrestrial Civilization Research Group, acknowledged this in the Science & Technology Daily report: <\/p>\n\n

\n

The possibility that the suspicious signal is some kind of radio interference is also very high, and it needs to be further confirmed and ruled out. This may be a long process.<\/p>\n<\/blockquote>\n\n

And we may need to get used to a gap between finding candidate signals and verifying them. FAST and other telescopes are likely to find many more signals of interest. <\/p>\n\n

Most of these will turn out to be interference, but some may be new astrophysical phenomena, and some may be bona fide<\/em> technosignatures.<\/p>\n\n\n\n

Stay intrigued<\/h2>\n\n

Will FAST\u2019s extraordinary signals meet the burden of extraordinary evidence? Until their work is reviewed and published, it\u2019s still too early to say, but it\u2019s encouraging that their SETI search algorithms are finding curious signals. <\/p>\n\n

Between FAST, the Breakthrough Listen<\/a> initiative, and the SETI Institute\u2019s COSMIC<\/a> program, the SETI field is seeing a lot of interest and activity. And it\u2019s not just radio waves: searches are also underway using optical and infrared light<\/a>. <\/p>\n\n

As for right now: stay intrigued, but don\u2019t get too excited.\"The<\/p>\n\n

Danny C Price<\/a>, Senior research fellow, Curtin University<\/a><\/em><\/span><\/p>\n\n

This article is republished from The Conversation<\/a> under a Creative Commons license. Read the original article<\/a>.<\/p>\n\n","protected":false},"excerpt":{"rendered":"Danny C Price, Curtin University \u201cExtraordinary claims require extraordinary evidence.\u201d \u2013 Carl Sagan (Cosmos, 1980) This phrase is…\n","protected":false},"author":116,"featured_media":4417,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[14],"tags":[558,474],"class_list":{"0":"post-4416","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-space","8":"tag-fast","9":"tag-the-conversation","10":"cs-entry","11":"cs-video-wrap"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/4416","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\/116"}],"replies":[{"embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/comments?post=4416"}],"version-history":[{"count":1,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/4416\/revisions"}],"predecessor-version":[{"id":4418,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/posts\/4416\/revisions\/4418"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/media\/4417"}],"wp:attachment":[{"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/media?parent=4416"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/categories?post=4416"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/modernsciences.org\/staging\/4414\/wp-json\/wp\/v2\/tags?post=4416"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}