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class="ar_con_nr"> <div id="8hh5rq1ip" class="con_l fl"> <article class="ar_con bg louti"> <div id="8hh5rq1ip" class="ar_title"> <h1>談?wù)勈澜缟献畲蟮男行?/h1> <div id="8hh5rq1ip" class="ar_title_b"> <div id="8hh5rq1ip" class="sub_title clear"> <span id="8hh5rq1ip" class="sp2 c6 fl">時(shí)間：<time class="fxtime">2017-06-30 14:50:10</time></span> <span id="8hh5rq1ip" class="sp1 c6 fl"><em id="zuozhe" class="noshow">鞏詩1</em><em class="user_id noshow">755</em>由 <em class="nickname"></em> 分享</span> <span id="8hh5rq1ip" class="fl arc_btn"></span> </div> </div> </div> <div id="8hh5rq1ip" class="y_ju"></div> <div id="8hh5rq1ip" class="con_article con_main" id="contentText"> <p>談?wù)勈澜缟献畲蟮男行?/p><p> 　　世界上最大的行星是什么呢?你也當(dāng)一回科學(xué)家和學(xué)習(xí)啦小編一起談?wù)勈澜缟献畲蟮男行前?</p><p> 　　東京天文學(xué)家經(jīng)過一年的跟蹤觀察，發(fā)現(xiàn)了一顆擁有最大固體核心的太陽系外行星。該行星直徑是木星的3/4，其核心相當(dāng)于地球的70倍，其質(zhì)量的1/2至2/3都來自集中在核心的重元素。相關(guān)論文將發(fā)表在《天體物理學(xué)》雜志上。</p><p> 　　由日本國立天文臺、神戶大學(xué)、東京工業(yè)大學(xué)和美國舊金山大學(xué)的科學(xué)家組成的聯(lián)合觀測小組，利用設(shè)置在夏威夷的“昴”天文望遠(yuǎn)鏡，首次發(fā)現(xiàn)了這顆位于編號HD149026恒星附近的行星，它以極小的軌道半徑繞HD149026旋轉(zhuǎn)，周期為2.87天?！　〗衲?月，科學(xué)家使用美國亞利桑那的一個(gè)較小的望遠(yuǎn)鏡發(fā)現(xiàn)，在其公轉(zhuǎn)周期中恒星的亮度有一個(gè)0.3%的下降，這表明該行星公轉(zhuǎn)軌道直接經(jīng)過了其環(huán)繞的恒星到地球的連線?？茖W(xué)家借此通過“掩星法”測出了該行星的大小和質(zhì)量，并由此計(jì)算出了它的密度。經(jīng)過計(jì)算，要達(dá)到這一密度，這顆行星不可能僅由氣體組成，內(nèi)部有大于70倍地球質(zhì)量的巨大固體核才能形成。</p><p> 　　該行星的溫度高達(dá)1200攝氏度，它距環(huán)繞恒星的距離只有地球到太陽的1/25。可能是由于摩擦力使其速度下降，恒星的引力將它拖到了目前這個(gè)距離更近的軌道上</p><p> 　　美國加州大學(xué)圣克魯斯分校的格雷格·拉夫林說：“這是一個(gè)很怪異的天體。”東京工業(yè)大學(xué)的井田茂博士則認(rèn)為，這是自發(fā)現(xiàn)飛馬座51號行星以來最重要的發(fā)現(xiàn)，突破了星核質(zhì)量達(dá)地球質(zhì)量30倍為極限的理論。</p><p> 　　實(shí)際上，這一發(fā)現(xiàn)對兩個(gè)主要的行星形成理論提出了挑戰(zhàn)。根據(jù)“核心增長模型”，行星形成就像滾雪球，連續(xù)的隨機(jī)碰撞逐漸集結(jié)成一個(gè)固體核心，生長中的核心重力不斷增加，開始吸引更多的物質(zhì)和氣體。而在“重力不穩(wěn)定模型”中，氣體巨星則通過圍繞在一個(gè)年輕恒星周圍的塵埃和氣云直接冷凝而快速形成。</p><p> 　　拉夫林認(rèn)為，“重力不穩(wěn)定模型”中的氣體巨星可以通過與彗星或小行星碰撞獲得重元素，但其獲得的物質(zhì)卻不可能像現(xiàn)在觀測到的這么多。他認(rèn)為，這顆行星是一個(gè)例外，對這個(gè)高密度核心的一種解釋是，它可能與一個(gè)或更多的行星發(fā)生過碰撞。如果是這樣的話，這種碰撞可能會使該行星脫離了其環(huán)繞恒星的赤道平面。科學(xué)家目前正在研究其自轉(zhuǎn)軸，以查明真相。</p> </div> <div id="8hh5rq1ip" class="y_ju"></div> <div id="8hh5rq1ip" class="pnum"> <ul id="page_slice"> <div id="8hh5rq1ip" class="clear"></div> </ul> </div> </article> <div id="8hh5rq1ip" class="list_hot ar_related bj_mt20 louti"> <h4 class="title2 title2_te">相關(guān)文章</h4> <ul class="bj_mt20"> <li id="8hh5rq1ip" class="lb_3 chao"> <time>04-13</time> <a href="http://wyyxscd8644.com/baikezhishi/2577514.html" title="世界最大的墳?zāi)故悄膫€(gè)" target="_blank">世界最大的墳?zāi)故悄膫€(gè)</a> </li> <li id="8hh5rq1ip" class="lb_3 chao"> <time>04-13</time> <a href="http://wyyxscd8644.com/baikezhishi/2775751.html" title="世界上最大的陵墓排名是怎樣的" target="_blank">世界上最大的陵墓排名是怎樣的</a> </li> <li id="8hh5rq1ip" class="lb_3 chao"> <time>02-16</time> <a 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