Question

What is modern science? and diffirent between ealier science?

Answer 1

The observation, identification, description, experimental investigation, and theoretical explanation of phenomena: new advances in scienceand technology. b. Such activities restricted to a class of natural phenomena: the science of astronomy.

Answer 2

Science is the field of giving rigorous answers, but ironically the definition of "science" is itself not rigorous.

Science is:

Processes for creating models for reliable prediction and control of the natural world;

Models created using those processes; and  

Application of those models.