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    <h1>Planets Data</h1>

            Data about the planets of our solar system (Planetary facts taken from <a
                href="http://nssdc.gsfc.nasa.gov/planetary/factsheet/">Nasa's Planetary Fact Sheet -

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            <th scope="col">Mass(10<sup>24</sup>kg)</th>
            <th scope="col">Diameter (km)</th>
            <th scope="col">Density (kg/m<sup>3</sup>)</th>
            <th scope="col">Gravity (m/s<sup>2</sup>)</th>
           <th scope="col">Length of day (hours)</th>
            <th scope="col">Distance from Sun (10<sup>6</sup>km)</th>
           <th scope="col">Mean temperature (°C)</th>
           <th scope="col">Number of moons</th>
            <th scope="col">Notes</th>



              <th scope="row" rowspan="4" colspan="2">Terrestrial planets</th>
                <th scope="row">Mercury</th>
                <td>Closest to the Sun</td>
                <th scope="row">Venus</th>
                <th scope="row">Earth</th>
                <td>Our world</td>

                <th scope="row">Mars</th>
                <td>3933 </td>
                <td>3.7 </td>
                <td>The red planet</td>

                <th scope="row" rowspan="4">Jovian planets</th>
              <th scope="row" rowspan="2">Gas giants</th>
                <th scope="row">Jupiter</th>
                <td>The largest planet</td>
                <th scope="row">Saturn</th>
                <th scope="row" rowspan="2">Ice giants</th>
                <th scope="row">Uranus</th>
                <th scope="row">Neptune</th>

              <th scope="row" colspan="2">Dwarf planets</th>
                <th scope="row">Pluto</th>
                <td>Declassified as a planet in 2006, but this <a


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