Neptune's surface is very different than most of the planet's surfaces. Neptune has a rocky inner core, which is completely surrounded by water. Its atmosphere is made up of seventy-four percent hydrogen, twenty-five percent helium, and one-percent methane. ...

Throughout the long history of the Earth, the planet has been struck a number of times by rogue asteroids. I will briefly discuss the effect that such an event could have on the Earth's climate, atmosphere and temperature. A number of problems could arise from such an event, many of which coul...