북극성(polalis)은 육안상 50번째로 밝은 2등급 별에 불과하지만 이정표로서 중요

<p style="text-align: left;">다중성계 북극성(별3개 집합체)<br>2등급 별<br>433광년 거리<br>작은 우르사 꼬리끝 별<br>태양보다 2500배 밝아<br><br><br><br><a href="https://youtu.be/0svHWB8UMZ0" target="_blank" class="ke-link">https://youtu.be/0svHWB8UMZ0</a></p><div class="figure-video" data-ke-type="video" data-video-url="https://www.youtube.com/watch?v=0svHWB8UMZ0&feature=youtu.be" data-video-host="youtube" data-video-play-service="daum_cafe" data-video-width="0" data-video-height="0" data-ke-style="alignCenter" data-video-thumbnail="http://scrap.kakaocdn.net/dn/gLxtE/hyKo2FNydy/3XSPwH6Oy6bqCTLIliI3H1/img.jpg?width=1280&height=720&face=0_0_1280_720" data-ke-mobile-mobileStyle="widthFull" data-video-origin-width="0" data-video-origin-height="0"><iframe src="https://www.youtube.com/embed/0svHWB8UMZ0" width="0" height="0" frameborder="0" scrolling="no" allowfullscreen=""></iframe><div class="figcaption"></div></div><p style="text-align: left;"></p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1Uwg9/adf0df1802a96a066e00ffc90c4cb86fa115935e" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1Uwg9/adf0df1802a96a066e00ffc90c4cb86fa115935e" data-origin-width="640" data-origin-height="640"></div><p style="text-align: left;">우르사(ursa) 또는 우루사는 일본 미쓰비시다나베제약이 개발을 한 우르소데옥시콜산(UDCA)과 곰의 쓸개 웅담을 주성분으로 하는 대웅제약의 의약품으로, 1961년에 처음 발매되었다.<br><br>'우루사'라는 이름은 곰을 뜻하는 라틴어 'Ursa', 'Ursus'에서 따 온 것이다.</p><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img src="https://t1.daumcdn.net/cafeattach/1Uwg9/ced8aaf975cf57e9a7e18d6cc21757a2315e8805" class="txc-image" data-img-src="https://t1.daumcdn.net/cafeattach/1Uwg9/ced8aaf975cf57e9a7e18d6cc21757a2315e8805" data-origin-width="800" data-origin-height="531"></div><div class="figure-img" data-ke-type="image" data-ke-style="alignCenter" data-ke-mobilestyle="widthOrigin"><img 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