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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/C.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='NASA Spacecraft Detects a Hum in Interstellar Space' data-article-id='5653'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='14625'>Scientists say NASA’s most distant exploring spacecraft has recorded what they describe as ‘humming’ beyond our solar system.</span> <span data-start-time='14625' data-end-time='29583'>A new study suggests the continuous hum, detected by the Voyager 1 spacecraft, is caused by waves existing in interstellar space. </span> <span data-start-time='29583' data-end-time='43271'>Voyager 1 left our solar system eight years ago, crossing the border that divides our solar system from interstellar space.</span> <span data-start-time='43271' data-end-time='47896'>“Interstellar” means “between stars.” </span> <span data-start-time='47896' data-end-time='60938'>Scientists say interstellar space begins where the sun's continual flow of material and its magnetic field stop.</span> <span data-start-time='60938' data-end-time='77750'>Researchers say instruments on Voyager 1 identified the waves as vibrations in small amounts of gas found in the near-emptiness of interstellar space. </span> <span data-start-time='77750' data-end-time='84438'>The vibrations are also known as plasma waves. </span> <span data-start-time='84438' data-end-time='93167'>The spacecraft detected the waves over several years at different radio frequencies.</span> <span data-start-time='93167' data-end-time='103500'>Results from Voyager 1’s findings were recently published in a study appearing in Nature Astronomy.</span> <span data-start-time='103500' data-end-time='120271'>Astronomers believe the space that Voyager 1 is passing through -- known as the interstellar medium -- is filled with different kinds of waves, both big and small. </span> <span data-start-time='120271' data-end-time='129375'>Such waves can provide information about the density of the interstellar medium.</span> <span data-start-time='129375' data-end-time='143708'>The new research was led by Stella Ocker, a doctoral student at New York’s Cornell University and a member of NASA’s Voyager 1 team. </span> <span data-start-time='143708' data-end-time='158667'>She was able to make the discovery by examining data slowly sent back by Voyager 1 from about 23 billion kilometers away.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/5085/C.jpeg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=17461 data-hint-location='60938' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/what_does_interstellar_mean.wav'>What does interstellar mean?</div><div class='choices' data-correct-choice='Between stars'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/between_stars.wav'><span>Between stars</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/inside_a_star.wav'><span>Inside a star</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/outside_a_black_hole.wav'><span>Outside a black hole</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/beyond_earths_atmosphere.wav'><span>Beyond Earth's atmosphere</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=17462 data-hint-location='14625' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/which_spacecraft_detected_the_hum.wav'>Which spacecraft detected the hum?</div><div class='choices' data-correct-choice='Voyager 1'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/voyager_1.wav'><span>Voyager 1</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/voyager_2.wav'><span>Voyager 2</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/the_eagle.wav'><span>The Eagle</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/curiosity_rover.wav'><span>Curiosity Rover</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=17463 data-hint-location='84438' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/the_spacecraft_detected_the_waves_over_several_years_at_different__blank__frequencies.wav'>The spacecraft detected the waves over several years at different <span class='blank'>radio</span> frequencies.</div><div class='choices' data-correct-choice='radio'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/digital.wav'><span>digital</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/radio.wav'><span>radio</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/highpitched.wav'><span>high-pitched</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/5085/delta.wav'><span>delta</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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