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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/1857/secret_space_plane.m4a' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Secret Space Plane Lands After Two Years in Orbit' data-article-id='2374'><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='23125'>That is the sound of the United States Air Force’s unmanned spacecraft landing at the Kennedy Space Center in Florida over the weekend.</span> <span data-start-time='23125' data-end-time='31854'>The United States Department of Defense posted a video of the landing on YouTube.</span> <span data-start-time='31854' data-end-time='42188'>The Air Force’s X-37B spacecraft passed over the state of Florida early in the morning Sunday.</span> <span data-start-time='42188' data-end-time='46000'>It made a different sound then.</span> <span data-start-time='46000' data-end-time='49396'>It created a “sonic boom.”</span> <span data-start-time='49396' data-end-time='63292'>That is the noise caused by something traveling faster than the speed of sound or 1,225 kilometers per hour.</span> <span data-start-time='63292' data-end-time='70854'>The sonic boom served as a surprising alarm clock for some Floridians.</span> <span data-start-time='70854' data-end-time='80125'>They took to Twitter to express their shock and describe the loud noise.</span> <span data-start-time='80125' data-end-time='86979'>One person said she thought someone had crashed into her garage.</span> <span data-start-time='86979' data-end-time='94125'>The X-37B was first used in 2010.</span> <span data-start-time='94125' data-end-time='103146'>Each time it goes on a mission, it stays in space and orbits the Earth many times.</span> <span data-start-time='103146' data-end-time='109979'>In its first mission, it stayed in space for about six months.</span> <span data-start-time='109979' data-end-time='119333'>Its second mission was close to a year, and its third mission was close to two years.</span> <span data-start-time='119333' data-end-time='128396'>On Sunday, the plane ended its fourth mission about two weeks short of two years.</span> <span data-start-time='128396' data-end-time='135021'>So, what does the plane do when it is in space?</span> <span data-start-time='135021' data-end-time='137604'>No one really knows.</span> <span data-start-time='137604' data-end-time='140167'>It is classified.</span> <span data-start-time='140167' data-end-time='147604'>That means only certain military members are permitted to know about its mission.</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/1857/secret_space_plane.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=8627 data-hint-location='94125' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/what_does_orbit_mean.m4a'>What does orbit mean?</div><div class='choices' data-correct-choice='curved path'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/curved_path.m4a'><span>curved path</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/pass_over_head.m4a'><span>pass over head</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/know_a_mission.m4a'><span>know a mission</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/travel_fast.m4a'><span>travel fast</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=8628 data-hint-location='135021' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/what_does_the_plane_do.m4a'>What does the plane do?</div><div class='choices' data-correct-choice='no one knows'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/crash_land.m4a'><span>crash land</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/run_experiments.m4a'><span>run experiments</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/no_one_knows.m4a'><span>no one knows</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/test_the_atmosphere.m4a'><span>test the atmosphere</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=8629 data-hint-location='63292' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/the_sonic_boom_served_as_a__blank__alarm_clock.m4a'>The sonic boom served as a <span class='blank'>surprising</span> alarm clock.</div><div class='choices' data-correct-choice='surprising'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/expected.m4a'><span>expected</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/loud.m4a'><span>loud</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/surprising.m4a'><span>surprising</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/1857/welcome.m4a'><span>welcome</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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