I just always assumed to achieve higher speeds in the universe you needed to be smaller and more aerodynamic. The Lockheed Blackbird is the fastest fighter jet we have and it goes only 2000mph. This fighter jet seems like it would be more aerodynamic than a rocket ship.
What is special about the rocket ships that allow them to achieve 25,000mph without being disintegrated when leaving the atmosphere and achieving escape velocity to go into space?
Any help would be greatly appreciated.