The question of the origin of the universe and whether it came from an absolute nothing is a topic of active scientific and philosophical debate. The nature of existence before the Big Bang, if there was such a state, is still not fully understood.
Our current understanding of the Big Bang is based on the framework of general relativity, which describes the expansion of the universe from an extremely hot and dense state. However, general relativity breaks down at the singularity of the Big Bang, and we don't currently have a complete theory that incorporates both general relativity and quantum mechanics to explain the origin of the universe.
The concept of "nothing" is philosophically and scientifically complex. In physics, the term "nothing" can refer to the absence of matter and energy, but it does not necessarily imply the absence of fundamental physical laws or potential underlying structures. Quantum field theory suggests that even in seemingly empty space, there are fluctuations and quantum fields that can give rise to particle-antiparticle pairs. So the notion of "nothing" in physics is more subtle than absolute emptiness.
Regarding the existence of something in the absence of space, our intuition is based on our everyday experiences within a three-dimensional world. However, at the scale of the universe or during the extreme conditions of the early universe, our intuitions may not hold. The nature of existence outside of space and time, if such a state existed, is speculative and not well understood.
It's important to note that scientists are actively researching and developing various theories to explain the origin of the universe, such as inflationary cosmology and quantum cosmology. These theories attempt to address questions about the initial conditions and the nature of existence before the Big Bang. However, due to the limitations of our current knowledge and understanding, we do not have definitive answers to these profound questions.
Ultimately, the origin of the universe and the nature of existence before the Big Bang remain fascinating areas of scientific exploration, and researchers continue to push the boundaries of our understanding in search of answers.