{"id":579,"date":"2020-12-07T14:33:04","date_gmt":"2020-12-07T14:33:04","guid":{"rendered":"https:\/\/aanewshop.com\/?p=579"},"modified":"2020-12-07T14:33:04","modified_gmt":"2020-12-07T14:33:04","slug":"here-are-10-of-arecibos-most-interesting-achievements","status":"publish","type":"post","link":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/","title":{"rendered":"Here are 10 of Arecibo\u2019s most interesting achievements"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<p>The sun set on the iconic Arecibo telescope.<\/p>\n<p>Since 1963, this colossal radio telescope in Puerto Rico has observed from space rocks passing through Earth to mysterious explosions of radio waves from distant galaxies. But on December 1, the 900-metric ton platform of scientific instruments on top of the plate fell, knocking down the telescope and spelling out the end of Arecibo&#39;s days of observation.<\/p>\n<p>Arecibo made too many discoveries to include in a list of the top 10, so some of his big hits didn\u2019t make the cut, like a strange class of stars that seem to turn on and off (SN: 1\/6\/17), and ingredients for life in a distant galaxy. But in honor of Arecibo\u2019s 57 years of permanence as one of the world\u2019s leading observatories, here are 10 of the telescope\u2019s most interesting achievements, presented in reverse order of coolness.<\/p>\n<h4>10. Clock the crab nebula pulsar<\/h4>\n<p>Astronomers originally thought that flashing stars called pulsars, discovered in 1967, could be pulsating white dwarf stars (SN: 27\/04\/68). But in 1968, Arecibo saw the pulsar in the center of the crab nebula blink every 33 milliseconds, faster than white dwarfs can pulsate. (SN: 07\/12\/68). That discovery strengthened the idea that pulsars are actually rapidly rotating neutron stars, stellar corpses that sweep beams of radio waves around in space like celestial beacons (SN: 1\/3\/20).<\/p>\n<p><span class=\"caption wp-caption-3094159\">Arecibo&#39;s observations about the frequency of radio flashes from the pulsar in the center of the crab nebula (red star in the middle) supported the idea that pulsars are rapidly rotating neutron stars.<\/span><span class=\"credit wp-credit-3094159\">Optics: NASA, HST, ASU, J. Hester et al .; X-rays: NASA, CXC, ASU, J. Hester et al.<\/span><\/p>\n<h4>9. Reborn bracelets<\/h4>\n<p>In 1982, Arecibo made a pulsar, called PSR 1937 + 21, which flashed every 1.6 milliseconds, leaving the neutron star of the Crab Nebula as the fastest known pulsar (SN: 12\/4\/82). That discovery was puzzling at first because PSR 1937 + 21 is older than the crab nebula pulsar and the pulsars were thought to rotate more slowly with age.<\/p>\n<p>Then astronomers realized that old pulsars can \u201cspin\u201d by sifting the mass of a companion star and flashing each one for up to 10 milliseconds. The NANOGrav project now uses fast fire radio beacons as extremely accurate cosmic clocks to search for waves in space-time known as gravitational waves (SN: 2\/11\/16).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"1030\" height=\"650\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_mt_arecibo_top10_inline2_rev.jpg\" alt=\"Push button illustration\" class=\"wp-image-3094160\"\/><span class=\"caption wp-caption-3094160\">Pulsars usually rotate more slowly as they age. But Arecibo\u2019s data showed that pulsars can \u201crotate\u201d to rotate hundreds of times per second by sifting through the material of a neighboring star (as seen in this artist\u2019s print; the pulsar in blue).<\/span><span class=\"credit wp-credit-3094160\">ESA, Francesco Ferraro \/ Bologna Astronomical Observatory<\/span><\/p>\n<h4>8. Ice on mercury<\/h4>\n<p>Mercury seems like it would be an unlikely place to find water ice because the planet is too close to the sun. But Arecibo&#39;s observations in the early 1990s suggested that ice was lurking in craters with permanent shadow at Mercury&#39;s poles (SN: 11\/9\/91). NASA&#39;s MESSENGER spacecraft later confirmed those observations (SN: 11\/30\/12). The discovery of ice on Mercury has raised doubts about whether ice could also exist in moon-shaded craters, and recent observations of spacecraft indicate that it does (SN: 5\/9\/16).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"680\" height=\"660\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_mt_arecibo_top10_inline3_680-square.jpg\" alt=\"By the north of Mercury\" class=\"wp-image-3094114\"\/><span class=\"caption wp-caption-3094114\">Images of Mercury taken by NASA&#39;s MESSENGER spacecraft in 2011 and 2012 confirmed that signs of water ice (yellow) seen on the planet by Arecibo reside in shady regions at Mercury&#39;s poles (north, shown; two craters labeled).<\/span><span class=\"credit wp-credit-3094114\">NASA, JHUAPL, Carnegie Institution of Washington, Arecibo Observatory<\/span><\/p>\n<h4>7. Unveiling Venus<\/h4>\n<p>Venus is shrouded in a thick layer of clouds, but Arecibo&#39;s radar beams could traverse that fog and bounce off the surface of the rocky planet, allowing researchers to map the terrain. In the 1970s, Arecibo&#39;s radar vision obtained the first large-scale views of the surface of Venus (SN: 03\/11\/79). Their radar images revealed evidence of past tectonic and volcanic activity on the planet, such as ridges and valleys (SN: 22\/04\/89) and ancient lava flows (SN: 18\/9\/76).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"508\" height=\"450\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_mt_arecibo_top10_inline4-508x450.jpg\" alt=\"radar image of the surface of Venus\" class=\"wp-image-3094108\"\/><span class=\"caption wp-caption-3094108\">Arecibo provided this initial view of the surface of Venus using radar in 1971.<\/span><span class=\"credit wp-credit-3094108\">D.B. Campbell \/ Cornell University<\/span><\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"508\" height=\"450\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_mt_arecibo_top10_inline5_rev-508x450.jpg\" alt=\"Image of Venus 2015\" class=\"wp-image-3094158\"\/><span class=\"caption wp-caption-3094158\">Technological advances have allowed Arecibo to get sharper views of Venus. This 2015 image shows the northern hemisphere of the planet.<\/span><span class=\"credit wp-credit-3094158\">Smithsonian Institution, NASA GFSC, Arecibo Observatory, NAIC<\/span><\/p>\n<h4>6. The Mercury Revolution<\/h4>\n<p>In 1965, Arecibo&#39;s radar measurements revealed that Mercury rotates on its axis once every 59 days, instead of every 88 days (SN: 5\/1\/65). That observation clarified a long-standing mystery about the temperature of the planet. If Mercury rotated on its axis once every 88 days, as previously thought, then the same side of the planet would always be facing the sun. This is because it also takes the planet 88 days to complete an orbit around the sun.<\/p>\n<p>As a result, that side would be much hotter than the dark side of the planet. The 59-day rotation coincided best with the observation that Mercury&#39;s temperature is fairly uniform over its entire surface.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"1030\" height=\"579\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_mt_arecibo_top10_inline6.jpg\" alt=\"Mercury\" class=\"wp-image-3094107\"\/><span class=\"caption wp-caption-3094107\">Arecibo&#39;s first radar observations measured Mercury&#39;s 59-day rotational speed (shown in this false-color image of data from the MESSENGER spacecraft, which highlights the chemical and mineralogical characteristics on the planet&#39;s surface).<\/span><span class=\"credit wp-credit-3094107\">NASA, JHUAPL, Carnegie Institution of Washington<\/span><\/p>\n<h4>5. Asteroid mapping<\/h4>\n<p>Arecibo cataloged the characteristics of many asteroids close to Earth (SN: 5\/7\/10). In 1989, the observatory created a radar image of the asteroid 4769 Castalia, revealing the first known double-wolf rock in the solar system (SN: 25\/11\/89). Arecibo found space rocks orbiting each other in pairs (SN: 29\/10\/03) and trios (SN: 17\/07\/08).<\/p>\n<p>Other strange finds included a space rock whose shadows made Arecibo look like a skull and an asteroid in the unlikely shape of a dog bone (SN: 24\/07\/01). Understanding the characteristics and motion of asteroids close to Earth helps determine which can pose a danger to Earth and how they can be safely deflected.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"800\" height=\"400\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_MT_arecibo_top10_inline7-800x400.jpg\" alt=\"216 images of Cleopatra&#39;s asteroids\" class=\"wp-image-3094116\"\/><span class=\"caption wp-caption-3094116\">Arecibo&#39;s radar images in 2000 revealed the strange shape of the dog&#39;s bone from an asteroid called 216 Kleopatra (shown from multiple angles).<\/span><span class=\"credit wp-credit-3094116\">WSU, NAIC, JPL \/ NASA<\/span><\/p>\n<h4>4. Telephones E.T.<\/h4>\n<p>The Arecibo Observatory issued the first radio message aimed at a foreign audience in November 1974 (SN: 23\/11\/74). That famous message was the most powerful signal ever sent from Earth, intended in part to demonstrate the capabilities of the observatory&#39;s new high-power radio transmitter.<\/p>\n<p>The message, aimed at a cluster of about 300,000 stars about 25,000 light-years away, consisted of 1,679 bits of information. That binary code string detailed the chemical formulas of the DNA components, a sketch of a man\u2019s figure, a schematic of the solar system, and other scientific data. <\/p>\n<h4>3. Repetition of radio explosions<\/h4>\n<p>Rapid radio bursts or FRBs are brief, bright bursts of radio waves of unknown origin. The first FRB known to emit multiple bursts was FRB 121102, which Arecibo first detected in 2012 and again in 2015 (SN: 3\/2\/16). Finding a repeated FRB ruled out the possibility that these explosions were generated by occasional cataclysmic events, such as stellar collisions. And because FRB 121102 kept repeating itself, astronomers were able to track it down to its home: a dwarf galaxy about 2.5 billion light-years away (SN: 1\/4\/17). This confirmed a decade-long suspicion that FRBs came from beyond the Milky Way.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"774\" height=\"450\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_MT_arecibo_top10_inline9-774x450.png\" alt=\"rapid burst radio source\" class=\"wp-image-3094109\"\/><span class=\"caption wp-caption-3094109\">A repeated source of radio waves discovered by Arecibo (radio image, left) was the first rapid radio explosion to go back to his home galaxy. The explosion originated in a dwarf galaxy about 2.5 billion light-years away (visible light image, right).<\/span><span class=\"credit wp-credit-3094109\">H. Falcke \/ Nature 2017<\/span><\/p>\n<h4>2. Make waves<\/h4>\n<p>Gravitational waves were first detected directly in 2015 (SN: 2\/11\/16), but astronomers saw the first indirect evidence of ripples in space-time decades ago. That evidence came from the first pulsar found orbiting another star, PSR 1913 + 16, first sighted by Arecibo in 1974 (SN: 19\/10\/74).<\/p>\n<p>By tracking the arrival time of radio explosions from that pulsar for several years, astronomers were able to trace their orbit and discovered that the 1913 + 16 PSR was spiraling toward its companion. As the orbits of the two stars contract, the binary system loses energy at the speed that would be expected if gravitational waves were whipped (SN: 24\/02\/79). This indirect observation of gravitational waves won the 1993 Nobel Prize in Physics (SN: 23\/10\/93).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"1030\" height=\"579\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_MT_arecibo_top10_inline10_rev.jpg\" alt=\"illustration of the star orbiting the pulsar\" class=\"wp-image-3094162\"\/><span class=\"caption wp-caption-3094162\">The first pulsar found orbiting another star, sighted by Arecibo in 1974, provided indirect evidence for the existence of ripples in space-time called gravitational waves (illustrated).<\/span><span class=\"credit wp-credit-3094162\">ESO, L. Road<\/span><\/p>\n<h4>1. Pulsar planets<\/h4>\n<p>The first planets discovered around another star were three small rocky worlds orbiting the pulsar PSR B1257 + 12 (SN: 1\/11\/92). The finding was somewhat serendipitous. In 1990, Arecibo was being repaired, so he was trapped looking at a point in the sky. During his observations, the Earth&#39;s rotation swept PSR B1257 + 12 through the telescope&#39;s field of view. Small fluctuations in the arrival time of the pulsar&#39;s radio explosions indicated that the star was swaying as a result of the gravitational pull of unseen planets (SN: 05\/05\/94).<\/p>\n<p>Thousands of exoplanets have since been discovered orbiting other stars, including sun-like stars (SN: 10\/8\/19). However, recent surveys of exoplanets suggest that planets orbiting the pulsar are rare (SN: 9\/3\/15).<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" width=\"1030\" height=\"650\" src=\"https:\/\/www.sciencenews.org\/wp-content\/uploads\/2020\/12\/120420_MT_arecibo_top10_inline11_rev.jpg\" alt=\"rocky planets orbiting the pulsar PSR B1257 + 12\" class=\"wp-image-3094161\"\/><span class=\"caption wp-caption-3094161\">The first worlds to be seen beyond the solar system were three rocky planets (seen in this artist\u2019s illustration) orbiting the PSR B1257 + 12 pulsar.<\/span><span class=\"credit wp-credit-3094161\">NASA, JPL-Caltech, R. Hurt \/ SSC<\/span><\/p>\n<p>[ad_2]<br \/>\n<br \/><a href=\"https:\/\/www.sciencenews.org\/article\/arecibo-telescope-collapse-astronomy-discoveries\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] The sun set on the iconic Arecibo telescope. Since 1963, this colossal radio telescope in Puerto Rico has observed from space rocks passing through Earth to mysterious explosions of radio waves from distant galaxies. But on December 1, the 900-metric ton platform of scientific instruments on top of the plate fell, knocking down the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":580,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-579","post","type-post","status-publish","format-standard","hentry","category-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Here are 10 of Arecibo\u2019s most interesting achievements - AA News Shop<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Here are 10 of Arecibo\u2019s most interesting achievements - AA News Shop\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The sun set on the iconic Arecibo telescope. Since 1963, this colossal radio telescope in Puerto Rico has observed from space rocks passing through Earth to mysterious explosions of radio waves from distant galaxies. 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Since 1963, this colossal radio telescope in Puerto Rico has observed from space rocks passing through Earth to mysterious explosions of radio waves from distant galaxies. But on December 1, the 900-metric ton platform of scientific instruments on top of the plate fell, knocking down the [&hellip;]","og_url":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/","og_site_name":"AA News Shop","article_published_time":"2020-12-07T14:33:04+00:00","og_image":[{"width":1440,"height":810,"url":"https:\/\/aanewshop.com\/wp-content\/uploads\/2020\/12\/Here-are-10-of-Arecibos-most-interesting-achievements.jpg","type":"image\/jpeg"}],"author":"Bruce Boitnott","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Bruce Boitnott","Est. reading time":"7 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/#article","isPartOf":{"@id":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/"},"author":{"name":"Bruce Boitnott","@id":"https:\/\/aanewshop.com\/#\/schema\/person\/8d9a50345624310ebeed2224c477a384"},"headline":"Here are 10 of Arecibo\u2019s most interesting achievements","datePublished":"2020-12-07T14:33:04+00:00","mainEntityOfPage":{"@id":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/"},"wordCount":1476,"publisher":{"@id":"https:\/\/aanewshop.com\/#organization"},"image":{"@id":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/#primaryimage"},"thumbnailUrl":"https:\/\/aanewshop.com\/wp-content\/uploads\/2020\/12\/Here-are-10-of-Arecibos-most-interesting-achievements.jpg","articleSection":["Science"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/","url":"https:\/\/aanewshop.com\/index.php\/2020\/12\/07\/here-are-10-of-arecibos-most-interesting-achievements\/","name":"Here are 10 of Arecibo\u2019s most interesting achievements - 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