mirror: 初始快照
This commit is contained in:
commit
fae8c948cd
319 files changed
+5217599
No files matched your search
@@ -0,0 +1,36 @@
|
||||
<html >
|
||||
<head >
|
||||
</head>
|
||||
<body >
|
||||
<mbp:pagebreak/>
|
||||
<tei-ms:entry>
|
||||
<tei-ms:orth><h1 align="center" >Saturn</h1></tei-ms:orth>
|
||||
</tei-ms:entry>
|
||||
<br />
|
||||
<div align="center" title="Saturn's great rings are impressive clouds of dirt."><img src="saturn.jpg" /></div>
|
||||
|
||||
<p ><b class="first" >S</b>aturn's rings make it one of the most familiar, and
|
||||
spectacular images of astronomy, not to mention science fiction. When Galileo
|
||||
trained a primitive telescope on the planet for the first time in 1610, he was
|
||||
misled. From the poorly resolved image in his viewfinder, he believed Saturn to
|
||||
be a triple-system, with a large body in the center and smaller ones on each
|
||||
side.</p>
|
||||
|
||||
<p >The rings may be much younger than the planet itself, and great
|
||||
mathematicians have found them worthy of contemplation. Laplace and James Clerk
|
||||
Maxwell calculated that Saturn's rings must consist of many smaller objects.</p>
|
||||
|
||||
<p >Although the planet is almost the size of <a href="jupiter.htm">Jupiter</a>, its mass is but one third
|
||||
as great, giving Saturn the lowest mean density of any solar system object.</p>
|
||||
|
||||
<p >As a gas giant, the planet has no single rotation period but rather a variety
|
||||
depending on latitude. Upper atmosphere clouds travel around the equator in as
|
||||
little as 10 hours and 10 minutes; clouds in high latitudes may take half and
|
||||
hour longer to pass across the planet.</p>
|
||||
|
||||
<p >Based on gravitational field data, Saturn appears to have a solid core with a
|
||||
mass equivalent to up to 20 <a href="earth.htm">Earths</a>. As the most oblate planet, the pull of
|
||||
gravity at its equator is less than three quarters of that at the poles.</p>
|
||||
|
||||
</body>
|
||||
</html>
|
||||
Reference in new issue
Block a user