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Jan 18th, 2017
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  1. <!DOCTYPE html>
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  6.   <title>Most Interesting Planets</title>
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  21.     <ul class="floatLeft">
  22.       <li><a href="index.html" class="here">home</a></li>
  23.       <li><a href="planets.html">more planets</a></li>
  24.       <li><a href="news.html">news</a></li>
  25.       <li><a href="contact.html" class="end">contact</a></li>
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  37.             <li><a href="index.html">Home</a></li>
  38.             <li><a href="planets.html">More Planets</a></li>
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  46. <h2>News</h2>
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  48.         Scientists have discovered two new exoplanet candidates orbiting a star some 300 light-years from Earth, and early indications suggest that this distant solar system harbours a dark, turbulent history.
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  50. The star in question, called HIP 68468, is what's called a solar twin, meaning it's similar to our own Sun in terms of temperature, age, and composition. But HIP 68468 looks to have consumed and destroyed one of the worlds that once orbited it, thanks to some tell-tale signs left behind at this (alleged) cosmic crime scene.
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  62.         <h1>Welcome!</h1>
  63.         <h2>My website is about different planets in our universe and I list some of the interesting one on this homepage. </h2>
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  65.         <p><img src="images/callisto.jpg" alt="pic" width="200" height="200" class="floatLeft"/>
  66.         <strong>Callisto</strong> is has a diameter of over 2,985 miles (4,800 km), Callisto is the third largest moon in our solar system and is almost the size of Mercury. Callisto is the outermost of the Galilean satellites, and orbits beyond Jupiter's main radiation belts. Callisto is the most heavily cratered object in our solar system. It is thought to be a long dead world, with hardly any geologic activity on its surface. </p>
  67.         <p>
  68.         It was discovered on 7 January 1610 by Galileo Galilei. The discovery, along with three other Jovian moons, was the first time a moon was discovered orbiting a planet other than Earth. The discovery of the four Galilean satellites eventually led to the understanding that planets in our solar system orbit the sun, instead of our solar system revolving around Earth.
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  70.         <p>The likely presence of an ocean within Callisto leaves open the possibility that it could harbor life. However, conditions are thought to be less favorable than on nearby Europa. Various space probes from Pioneers 10 and 11 to Galileo and Cassini have studied Callisto. Because of its low radiation levels, Callisto has long been considered the most suitable place for a human base for future exploration of the Jovian system.</p>
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  72.         <p>The Callistoan surface is asymmetric: the leading hemisphere is darker than the trailing one. This is different from other Galilean satellites, where the reverse is true. The trailing hemisphere of Callisto appears to be enriched in carbon dioxide, whereas the leading hemisphere has more sulfur dioxide. Many fresh impact craters like Lofn also show enrichment in carbon dioxide. Overall, the chemical composition of the surface, especially in the dark areas, may be close to that seen on D-type asteroids, whose surfaces are made of carbonaceous material.</p>
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  78.         <h1>Other Interesting Planets:</h1>
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  80.         <p><img src="images/kepler22b.jpg" alt="pic" width="240" height="200" class="floatLeft"/>
  81. <b>Kepler 22b</b> is 620 light years from Earth and the planet was discovered in 2009 and confirmed in December 2011. It was the first confirmed discovery by the Kepler Mission of a planet known to orbit in the habitable zone.
  82. The planet orbits a star similar in mass and radius to our own sun, but it is around 25% less bright. Kepler 22b orbits slightly closer to its parent star then Earth orbits the sun.</p>
  83. <p>Little is known about the planet's orbital path, if it is highly elliptical temperatures on Kepler 22b would vary dramatically. We can only guess at the surface composition of Kepler 22b, it could be similar to Earth, entirely covered in oceans or even a small gas planet and if the planet receives too much energy from it's star it could well suffer from a runaway greenhouse effect, resulting in baking hot surface temperatures similar to those on Venus.</p>
  84.  <p>If Kepler 22b has a similar composition to Earth its force of gravity would be more than twice as strong as it is on our own planet.<br>
  85.         </p>
  86.  <p><img src="images/uranus.jpg" alt="pic" width="200" height="200" class="floatLeft"/> <strong>Uranus</strong> is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both have different bulk chemical composition from that of the larger gas giants Jupiter and Saturn. For this reason, scientists often classify Uranus and Neptune as "ice giants" to distinguish them from the gas giants. </p>
  87. <p> Uranus's atmosphere is similar to Jupiter's and Saturn's in its primary composition of hydrogen and helium, but it contains more "ices" such as water, ammonia, and methane, along with traces of other hydrocarbons. It is the coldest planetary atmosphere in the Solar System, with a minimum temperature of 49 K (−224.2 °C), and has a complex, layered cloud structure with water thought to make up the lowest clouds and methane the uppermost layer of clouds. The interior of Uranus is mainly composed of ices and rock.</p>
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