DO COMETS MELT? | Standard vs Electric model | science for kids | electric universe | SafireDream
We will explore 2 theories – standard model and an electrical model.
how big is the comet? Does a comet melt? How much water is in a comet? Does comet evaporate? Why comet glows? Tails of comet. What is comet’s core? Is it a rock? Is it a snowball? What is nucleus? What is coma? 
https://www.youtube.com/watch?v=1gHdSg5NPRE