I. What is Cosmological Natural Selection? Cosmological Natural Selection is a theory proposed by physicist Lee Smolin that suggests the universe evolves through a process similar to biological natural selection. Just as biological organisms evolve through the mechanism of natural selection, where the fittest individuals are more likely to survive and reproduce, the universe itself … Read more
I. What is a MACHO? MACHO stands for Massive Astrophysical Compact Halo Object. These are astronomical objects that are composed of normal baryonic matter, such as planets, brown dwarfs, or even black holes, that do not emit enough light to be detected directly. MACHOs are considered a candidate for dark matter, which is a mysterious … Read more
I. What is the Integrated Sachs-Wolfe Effect? The Integrated Sachs-Wolfe Effect, often abbreviated as ISW, is a phenomenon in cosmology that describes the change in the temperature of the cosmic microwave background radiation as it passes through large-scale structures in the universe. This effect is named after Rainer K. Sachs and Arthur M. Wolfe, who … Read more
What is Cosmic Microwave Background (CMB)? Cosmic Microwave Background (CMB) is the faint glow of radiation that fills the universe, leftover from the Big Bang. It is the oldest light in the universe, dating back to just 380,000 years after the Big Bang. CMB is a key piece of evidence supporting the Big Bang theory … Read more
I. What is Dark Matter Particle? Dark matter is a mysterious substance that makes up about 27% of the universe, according to current estimates. Despite its prevalence, dark matter is invisible and does not emit, absorb, or reflect light, making it extremely difficult to detect. Scientists believe that dark matter is made up of particles … Read more
I. What is Hubble’s Law? Hubble’s Law is a fundamental principle in cosmology that describes the relationship between the distance of a galaxy from Earth and its velocity of recession. In simple terms, it states that the farther away a galaxy is from us, the faster it is moving away. This relationship is expressed by … Read more
I. What is False Vacuum? In the realm of theoretical physics, the concept of False Vacuum refers to a state of the universe that is not truly stable, but rather exists in a temporary or metastable state. This state is characterized by a potential energy minimum that is not the absolute lowest possible energy state. … Read more
I. What is a Cyclic Universe? The concept of a Cyclic Universe proposes that the universe undergoes an endless cycle of expansion and contraction, with each cycle lasting billions of years. In this model, the universe expands from a hot, dense state known as the Big Bang, reaches a maximum size, and then contracts back … Read more
I. What is Cosmic Dawn? Cosmic Dawn refers to the period in the history of the universe when the first stars and galaxies began to form. It marks the transition from a dark, featureless universe to one filled with light and structure. This era is of great interest to astronomers and cosmologists because it represents … Read more
I. What is the Cosmological Lithium Problem? The Cosmological Lithium Problem refers to the discrepancy between the predicted and observed abundance of lithium in the universe. According to the Big Bang nucleosynthesis theory, the early universe should have produced a certain amount of lithium, but observations show that there is much less lithium present in … Read more