Solved

earth.ctp in full

<?php $this->layout = 'applayout'; ?>

<div id="container">

    <div class="col-md-5 col-sm-5 " data-spy="scroll" data-target="#sidebar-nav">

        <?php echo $this->Html->image('earth1.jpg'); ?>

        <h2> Fact File </h2>


                <h3><?php echo $earth['Planet']['planet_name']; ?></h3>

                <p> <?php echo $earth['Planet']['planet_info']; ?></p>



    </div><!-- /.col-xs-12 main -->

    <!-- Text Area col-sm-4 -->
    <div class="col-md-6 col-sm-6  ">
		//planet_content goes here
    </div>
</div>



PlanetsController.php in full

<?php

    class PlanetsController extends AppController
    {
        public $name = 'Planets';
        public $helpers = array('Html', 'Form');
        public function earth() {


             $earth = $this->Planet->find('first', array('conditions' => array('planet_name' => 'Earth')));
$this->set('earth', $earth);


	}
        public function venus(){}
        public function mercury(){}
        public function mars(){}
        public function saturn(){}
        public function jupiter(){}
        public function uranus(){}
        public function neptune(){}

    }
    ?>