Before Einstein, the prevailing view of the universe was largely based on Isaac Newton's laws of motion and gravity. These laws, formulated in the late 17th century, provided a remarkably accurate description of the motion of objects on Earth and in the solar system. They also led to the understanding of gravity as a force acting between any two objects with mass.

However, there were several problems that Newton's theory couldn't explain, and these problems pointed towards the need for a new understanding of the universe:

* The speed of light: Newtonian physics assumed that gravity acted instantaneously across any distance. However, experiments showed that light travels at a finite speed, which contradicted this assumption.

* The perihelion precession of Mercury: Mercury's orbit around the Sun wasn't perfectly elliptical, but slightly shifted over time. Newtonian gravity couldn't explain this anomaly.

* The nature of gravity: While Newton's law explained how gravity works, it didn't explain what it *is*.

These problems led scientists to search for a new theory that could account for these discrepancies. Some of the important developments before Einstein included:

* Maxwell's Equations: James Clerk Maxwell's equations of electromagnetism in the mid-19th century established that light is an electromagnetic wave. This further strengthened the understanding that light travels at a finite speed, challenging the instantaneous nature of Newtonian gravity.

* Michelson-Morley experiment: This famous experiment in 1887 aimed to detect the hypothetical "luminiferous aether" that was thought to carry light waves. The experiment's null result, however, suggested that there is no such aether, further contradicting the Newtonian framework.

Einstein's theory of relativity, specifically special relativity (1905) and general relativity (1915), provided a new framework for understanding the universe. It addressed the shortcomings of Newtonian physics by:

* Challenging the absolute nature of space and time: Einstein's theory showed that space and time are not absolute but relative to the observer's frame of reference.

* Explaining the finite speed of light: It established the speed of light as a universal constant, independent of the observer's motion.

* Defining gravity as a curvature of spacetime: Instead of a force, Einstein described gravity as a warping of spacetime caused by massive objects. This explained the perihelion precession of Mercury and other phenomena.

Einstein's theories revolutionized our understanding of the universe and provided the foundation for modern cosmology, astrophysics, and other scientific fields.