A scientist can discover a new star but he cannot make one. He would have to ask an engineer to do it for him.

Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what is existing. Since a design has to be concrete, it must have its geometry, dimensions, and characteristic numbers. Almost all engineers working on new designs find that they do not have all the needed information. Most often, they are limited by insufficient scientific knowledge. Thus they study mathematics, physics, chemistry, biology and mechanics. Often they have to add to the sciences relevant to their profession. Thus engineering sciences are born.

Engineering or Technology is the making of things that did not previously exist, whereas science is the discovering of things that have long existed.

Engineers use knowledge primarily to design, produce, and operate artifacts. … Scientists, by contrast, use knowledge primarily to generate more knowledge.

Scientists study the world as it is, engineers create the world that never has been.

The scientist discovers a new type of material or energy and the engineer discovers a new use for it.

[An engineer's] invention causes things to come into existence from ideas, makes world conform to thought; whereas science, by deriving ideas from observation, makes thought conform to existence.