Milky Way, the Universe, Galaxies and the development of theories

ruralart

5-4-2008 9:17 PM

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/49b3ad83-f749-4867-922d-dcb28daa6742/D4D6FADF-E976-41C8-A337-528E3B2B4771/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm" href="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm" style="font-size: 11px;">ircamera.as.arizona.edu</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm"><table background="undefined" bgcolor=""><tr><TD width="67%"><BIG><BIG><STRONG>Discovery of Galaxies</STRONG></BIG></BIG><P><FONT color="#008000"><EM><BIG><BIG><STRONG>Key points: How it was established that other
    galaxies are island universes of stars; standard candles and distances; the distance
    ladder</STRONG></BIG></BIG></EM></FONT></p> <P> </p> <P><BIG>While the Milky Way was considered to be a thin, distorted disk of stars with the
    sun near the center in the early 20th century, other galaxies were confused with gaseous
    nebulae, and were assumed to be part of Milky Way. </BIG></p> <P><FONT size="4" color="#000000">The best pictures showed other galaxies to have spiral
    arms, but they also appeared smooth and were thought to be a special kind of gaseous
    nebulae, the "spiral nebulae".</FONT></p> <P> </p> <P> </p> <P> </p> <P> </P></TD></tr></table></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/ircamera.as.arizona.edu/img/BE9AD319-8483-4836-91D0-BED7540EFA3F" alt="picture of spiral galaxy" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm"><P><FONT color="#000000"><BIG>By the 1920s, a debate was ranging among astronomers about
whether the spiral nebulae were gaseous objects (HII regions) or separate "island
universes" like the Milky Way.</BIG></FONT><FONT size="5" color="#ff0000"><STRONG><SPAN> </SPAN></STRONG></FONT><BIG>Vesto Slipher had obtained <FONT color="#000000">spectra that showed them to have continuous spectra, not emission lines,
consistent with their being made of stars. </FONT></BIG></P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://ircamera.as.arizona.edu/NatSci102/NatSci102/lectures/galaxies.htm"><BIG>More on the debate at</BIG><SPAN> </SPAN><A href="http://antwrp.gsfc.nasa.gov/diamond_jubilee/debate_1920.html">http://antwrp.gsfc.nasa.gov/diamond_jubilee/debate_1920.html</A></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/D4D6FADF-E976-41C8-A337-528E3B2B4771/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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