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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=58" 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">科学家完成对哈勃常数至今最精确测量 </h1> <p class="xg1"> 时间：2018-7-17 09:19<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(647)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=6848&idtype=aid" title="查看全部评论"><em id="_commentnum">6</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" 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>利用哈勃和 Gaia 太空望远镜，一个国际团队完成了对哈勃常数迄今最精确的测量。研究报告发表在《天体物理学》期刊上。</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> 利用哈勃和 Gaia 太空望远镜，一个国际团队完成了对哈勃常数迄今最精确的<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测量</a>。研究报告发表在《天体<a href="http://theory.oecr.com" target="_blank" class="relatedlink">物理</a>学》期刊上。最新测得的哈勃常数值为 73.52 ± 1.62 s−1 Mpc−1 ，即一个星系与地球的距离每增加百万秒差距，其远离地球的速度就增加 73.52 公里／秒。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201807/17/091844beh7e7ynlqti6ri6.jpg" target="_blank"><img src="data/attachment/portal/201807/17/091844beh7e7ynlqti6ri6.jpg"></a></p></div><div><br></div><div> 测量星系距离的一个常用标尺是造父变星，它们是一类特殊的恒星，亮度变化周期与自身光度直接相关。研究人员观测银河系内的 50 颗造父变星，在此基础上得到的哈勃常数仅有 2.2% 的不确定性，这是迄今有关哈勃常数最低的不确定性。</div><div><br></div><div> 研究人员指出，新结果与用另一种方法测得的哈勃常数值差异较大，不能用测量误差来解释，可能需要新<a href="http://theory.oecr.com" target="_blank" class="relatedlink">理论</a>来描述宇宙的基本性质。另一种测量哈勃常数的方法是观察微波背景辐射。</div><div><br></div><div><p microsoft="" yahei",="" simsun;="" background-color:="" rgb(255,="" 255,="" 255);="" text-align:="" center;"="" center;="" 255);"="" style="text-align: center; word-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><b style="word-wrap: normal;"><font size="5" style="word-wrap: normal;">欢迎关注OECR公众号</font></b></p><p microsoft="" yahei",="" simsun;="" background-color:="" rgb(255,="" 255,="" 255);="" text-align:="" center;"="" center;="" 255);"="" style="text-align: center; word-wrap: normal; margin: 0px; padding: 0px; color: rgb(143, 143, 143); font-family: Tahoma, "Microsoft Yahei", Simsun; background-color: rgb(255, 255, 255);"><br 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