A universe without light would be an extremely different and challenging place compared to our current understanding of the universe. Light is fundamental to our perception and the way we interact with the world around us, so imagining a universe without light requires some speculation.
In a universe without light, there would be no electromagnetic radiation in the visible spectrum, meaning there would be no illumination as we experience it. All objects would be invisible to our eyes since we rely on light to perceive them. The absence of light would render the universe perpetually dark, and our visual perception would be useless.
Without light, other forms of sensory perception would become crucial for survival and understanding the environment. Life forms in such a universe would likely evolve to rely on alternative senses such as sound, touch, or chemical senses to navigate and interact with their surroundings. They might have highly developed hearing or other specialized sensory organs to compensate for the lack of light.
However, it's important to note that light plays a vital role in many biological processes on Earth, including photosynthesis, which is the foundation of most ecosystems. Without light, the primary source of energy for life as we know it would be absent. This would pose significant challenges for the existence of complex life forms, although it's not entirely impossible to envision alternative forms of life that could thrive in such conditions.
In terms of perceiving or studying a universe without light, it would be a significant challenge for beings like us who rely on light-based technologies. We would need to develop entirely new means of sensing and interacting with the universe to gain any understanding of its nature.
In summary, a universe without light would be a drastically different place, where vision as we know it would be impossible. Life would likely need to adapt and rely on alternative senses, and the absence of light would present significant challenges for the existence of complex life forms. Studying such a universe would require the development of alternative sensing mechanisms beyond our current understanding.