The physics (of mechanics) Galileo started to develop in the 17th Century has become the core physics repeatedly proven correct. It teaches that objects, which have masses and relative motions, produce all phenomena and predicted the presence of aether to produce all universal phenomena. Long-time failure in finding aether has led to the development of no-aether theories. Upon accepting them, physics has very serious scientific and inconsistency problems. Finding aether and its science is the major scientific breakthrough since Galileo. It offers a broad-scope understanding of the universal phenomena and the universe and brings physics back to science.