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<div id="pic1"> <img src="image/pic1.jpg" /> <a class="previous" href="#pic10"><img src="image/pic10.jpg" alt="Trees in the mist" /></a><a class="next" href="#pic2"><img src="image/pic2.jpg" alt="Wading birds" /></a>
<h3>黑洞</h3>
<p>黑洞就是中心的一个密度无限大、时空曲率无限高、体积无限小,热量无限大的奇点和周围一部分空空如也的天区,这个天区范围之内不可见。依据阿尔伯特-爱因斯坦的相对论,当一颗垂死恒星崩溃,它将聚集成一点,这里将成为黑洞,吞噬邻近宇宙区域的所有光线和任何物质。</p>
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<div id="pic2"> <img src="image/pic2.jpg" /> <a class="previous" href="#pic1"><img src="image/pic1.jpg" alt="Winter branches" /></a><a class="next" href="#pic3"><img src="image/pic3.jpg" alt="Bird on a post" /></a>
<h3>星云</h3>
<p>星云(Nebula)包含了除行星和彗星外的几乎所有延展型天体。它们的主要成份是氢,其次是氦,还含有一定比例的金属元素和非金属元素。1990年哈勃望远镜升空以来的研究还发现含有有机分子等物质。</p>
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<div id="pic3"> <img src="image/pic3.jpg"/> <a class="previous" href="#pic2"><img src="image/pic2.jpg" alt="Wading birds" /></a><a class="next" href="#pic4"><img src="image/pic4.jpg" alt="Early bloomers" /></a>
<h3>上帝之眼</h3>
<p>水瓶座螺旋状星云</p>
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<div id="pic4"> <img src="image/pic4.jpg" /> <a class="previous" href="#pic3"><img src="image/pic3.jpg" alt="Bird on a post" /></a><a class="next" href="#pic5"><img src="image/pic5.jpg" alt="Green lizard" /></a>
<h3>日食</h3>
<p>日食,又叫做日蚀,是月球运动到太阳和地球中间,如果三者正好处在一条直线时,月球就会挡住太阳射向地球的光,月球身后的黑影正好落到地球上,这时发生日食现象。</p>
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<div id="pic5"> <img src="image/pic5.jpg" /> <a class="previous" href="#pic4"><img src="image/pic4.jpg" alt="Early bloomers" /></a><a class="next" href="#pic6"><img src="image/pic6.jpg" alt="Feeding the birds" /></a>
<h3>星系</h3>
<p>星系源自于希腊语的γαλαξίας (galaxias)。广义上星系指无数的恒星系(包括恒星的自体)、尘埃(如星云等)组成的运行系统。参考银河系,它是一个包含恒星、气体的星际物质、宇宙尘和暗物质,并且受到重力束缚的大星系。</p>
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<div id="pic6"> <img src="image/pic6.jpg" alt="Feeding the birds" /> <a class="previous" href="#pic5"><i
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