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	<title>Astronomy-Astrophysics &#187; life on mars</title>
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		<title>what was one of the great discoveries in astronomy during the 20th century?</title>
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		<pubDate>Tue, 14 Jul 2009 07:25:09 +0000</pubDate>
		<dc:creator>Nikolai Alex</dc:creator>
				<category><![CDATA[Q-A]]></category>
		<category><![CDATA[astronomy]]></category>
		<category><![CDATA[billions]]></category>
		<category><![CDATA[cluster of galaxies]]></category>
		<category><![CDATA[galaxy]]></category>
		<category><![CDATA[great discoveries]]></category>
		<category><![CDATA[life on mars]]></category>
		<category><![CDATA[milky way]]></category>
		<category><![CDATA[space c]]></category>
		<category><![CDATA[sun]]></category>
		<category><![CDATA[twentieth century]]></category>
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		<description><![CDATA[One of the great discoveries in astronomy during the twentieth century was that
 A) there used to be life on Mars.
 B) at the largest scale, galaxies are randomly distributed in space.
 C) our star, the Sun, is located outside of the Milky Way.
 D) our galaxy is alone amongst the other galaxies; it is [...]]]></description>
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		<title>Understanding Planet Mars</title>
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		<pubDate>Tue, 19 May 2009 03:45:57 +0000</pubDate>
		<dc:creator>Nikolai Alex</dc:creator>
				<category><![CDATA[Guide]]></category>
		<category><![CDATA[journey into space]]></category>
		<category><![CDATA[life on mars]]></category>
		<category><![CDATA[mariner 4]]></category>
		<category><![CDATA[mars atmosphere]]></category>
		<category><![CDATA[mars odyssey orbiter]]></category>
		<category><![CDATA[methane]]></category>

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		<description><![CDATA[Mars was first noticed by the Babylonians, around 400 BC, but they called it Nergal. The Egyptians saw the planet, but weren&#8217;t impressed and they named it Har Decher, which means The Red One. The Romans called the planet Mars, naming it after the god of war. In 1609, Galileo was the first to see [...]]]></description>
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