The idea of describing the universe as a series of concentric spheres is not true in the modern scientific understanding of the universe. This concept is based on ancient Greek models, notably the geocentric model of Ptolemy, which placed Earth at the center of the universe with celestial bodies revolving around it in a series of nested spheres.

Here's why the concentric sphere model is outdated:

* Heliocentric model: The heliocentric model, proposed by Copernicus and later validated by Galileo, established the Sun as the center of our solar system. This model revolutionized our understanding of the cosmos and demonstrated that Earth is just one planet orbiting the Sun.

* Expansion of the universe: Modern cosmology shows that the universe is not static but expanding. This expansion is driven by a force known as dark energy and affects the distances between galaxies.

* Absence of a center: The expanding universe does not have a defined center. All points in the universe are equally valid as a reference point for observing the expansion.

* Large-scale structure: The universe is not a smooth, continuous space. Instead, it contains large-scale structures like galaxy clusters and superclusters, which are interconnected by filaments of matter.

While the concentric sphere model was a significant step in understanding the cosmos in its time, it is no longer a valid scientific model. Today, our understanding of the universe is based on more sophisticated models, such as the Big Bang theory, which describe the evolution and structure of the universe on a much grander scale.