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                                                                            Elon Musk on reusable heat shields and Mars reentry:
            
                
            
            
                            
                                                
                                
                                     
                                                                            
                            
                                    
            
                    
        
        
    
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                                                                            Elon Musk on reusable heat shields and Mars reentry:
— No one has created a truly reusable orbital heat shield before
— Reentry involves extreme heat and pressure — very hard to withstand
— Only advanced ceramics and carbon-based materials can survive it
— SpaceX aims to make 
                    
                    
                             btc
                                                            (
							
								                                 twitter.com)
						
                            
            
                                            
                                                00:02:28
                                            
                                        
                                                                    
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                                                                            Why is half of the ship black and half of it is silver colored?
            
            
                            
                                                
                                
                                     
                                                                            
                            
                                    
            
                    
        
        
    
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                                                                            Why is half of the ship black and half of it is silver colored?
that's because the bottom as seen from orbital entry is, has a heat shield on it. So the black there is the heat shield and then the core structure of the rocket is a special alloy of stainless steel and that's 
                    
                    
                             btc
                                                            (
							
								                                 twitter.com)
						
                            
            
            
                            
                                            
                                                00:00:55