<div id="ooyalaplayer" style="width: 800px; height: 450px;"></div><div style="display:none;" id="kalturavideoplaceholder">kalturavideoplaceholder</div><div><div><script src="https://apis.google.com/js/platform.js"></script>?<div class="g-ytsubscribe" data-channel="BusinessInsider" data-layout="full" data-count="default"></div></div></div><p class="embed-spacer"></p><p>The European Space Agency has launched Pathfinder LISA on a mission to test Albert Einstein's theory of relativity.</p><p>The space agency hopes the mission will unlock the secrets of gravity and set the pace for future space exploration.</p><p><em>Produced by</em>&#xa0;<em><a href="http://www.businessinsider.com/author/lamar-salter" target="_blank">Lamar Salter</a><br /></em></p><p><strong>Follow BI Video:</strong>&#xa0;<a href="https://www.facebook.com/BusinessInsider.Video">On Facebook</a></p>

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Europe has launched a spacecraft to test one of Einstein's most complex theories

kalturavideoplaceholder?The European Space Agency has launched Pathfinder LISA on a mission to test Albert Einstein's theory of relativity.The space agency hopes the mission will unlock the secrets of gravity and set the pace for future space exploration.Produced by&#xa0;Lamar SalterFollow BI Video:&#xa0;On Facebook

kalturavideoplaceholder? The European Space Agency has launched Pathfinder LISA on a mission to test Albert Einsteins theory of relativity.

Europe has launched a spacecraft to test one of Einstein's most complex theories

Lamar Salter

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