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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">肉眼可以看到多少颗星星 </h1> <p class="xg1"> 时间：2016-7-22 10:18<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(1124)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=4652&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a>来自: 科普中国</p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=62" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>天气晴朗的夜晚，遥远的天幕挂着一颗颗闪烁的星星，距离或近或远，体积或大或小，明亮不一，色泽不定，有的如宝石，有如水晶，一闪一闪惹人喜爱，吸引着人们的视线。无数人抬头仰望，感慨造物主的神奇。有些人则专门 ...</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div>天气晴朗的夜晚，遥远的天幕挂着一颗颗闪烁的星星，距离或近或远，体积或大或小，明亮不一，色泽不定，有的如宝石，有如水晶，一闪一闪惹人喜爱，吸引着人们的视线。无数人抬头仰望，感慨造物主的神奇。有些人则专门到郊外开阔处用望远镜观察这些美丽的星星。不少人小时候都有过数星星的经历，一颗、两颗、三颗……数着数着就糊涂了，然后不甘心再次重头数起，结果却睡着了……而那些星星却像是笑了，闪烁得更欢快了……</div><div style="text-align: center;"><p><a href="http://www.oecr.com/"><img src="data/attachment/portal/201607/22/101709d6php1s1h6mffpva.png"></a></p></div><div> </div><div>星星通常指不借助其他帮助，用肉眼便可观察到的宇宙天体。夜空中闪烁<a href="http://light.oecr.com" target="_blank" class="relatedlink">发光</a>的天体以及细小的发光体都是星星。有的星星在我们看来如圆球，体积较大，这可能是因为星星本身体积大、发光能力强或离地球很近；有些看来如一个小点，这可能是因为星星本身体积小、发光能力弱或离地球太远。</div><div><br></div><div style="text-align: center;"> <span style="line-height: 1.8em;"><a href="http://www.oecr.com/"><img src="data/attachment/portal/201607/22/101710xcrbsnqq25rg1gur.png"></a></span></div><div style="text-align: center;"><br></div><div>视星等是指观测者用肉眼所看到的星体亮度。绝对星等是设想将放在距离10秒差距（32.6光年，秒差距是天文学上常用的距离单位，一秒差距等于3.26光年）的地方，所观察到的星等。经过实验，科学家算出了目视星等和绝对星等间的转换公式，如果绝对星等用M表示，视星等用m表示恒星的距离化成秒差距数为d，即M＝m＋5－5 logd。</div><div> </div><div style="text-align: center;"> <span style="line-height: 1.8em;"><a href="http://www.oecr.com/"><img src="data/attachment/portal/201607/22/101715l2g0q2gi77mmt5k9.png"></a></span></div><div style="text-align: center;"><br></div><div>目前所知，大概有几千颗星星是处于肉眼可见范围内，不过人们所看到的星星要少很多，原因有二：一是差不多一半的恒星躲在了地平线上，无法看到。因为人的视线是直线，无法转弯；二是大气层在“捣乱”。在天气不好的时候，肉眼所能看到的星星很少。天气晴朗则肉眼可见的星星多。</div><div><br></div><div>观星赏月活动由来已久，是项优雅的、人人皆可的活动。人们抬头仰望星空，寄托情怀，畅谈心中志向，好不惬意。不过由于快速发展带来的环境污染，导致人们所能看到的星星越来越少。如今环境问题已引起人们的重视，相信随着环境日益变好，璀璨的星空将会再次出现。</div><div><p style="text-align: center;"><a href="data/attachment/portal/201607/22/101715jxmrplpxrvpkkpxr.jpg" target="_blank"><img src="data/attachment/portal/201607/22/101715jxmrplpxrvpkkpxr.jpg"></a></p><p class="MsoNormal" align="left" style="text-align: center;"><span style="mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体; mso-font-kerning:0pt;mso-bidi-language:AR">欢迎关注光电<a href="http://news.oecr.com" target="_blank" class="relatedlink">资讯</a>微信公众号，每天将由光电工程师<a href="http://club.oecr.com" target="_blank" class="relatedlink">社区</a>网站<span lang="EN-US">(oecr.com)</span>编辑团队为您精选行业动态，科技资讯，技术解析，光电<a href="http://www.oecr.com/portal.php?mod=list&catid=62" target="_blank" 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