The notion that we can see further into space each year does not stem from the speed of light changing. The speed of light, denoted as "c," is indeed constant in a vacuum and is approximately 299,792 kilometers per second (or about 186,282 miles per second).
The reason we can observe more distant objects in space over time is primarily due to advancements in technology and the development of more powerful telescopes. As our technology improves, we can build telescopes with larger apertures, better detectors, and more sensitive instruments. These advancements enable us to detect and capture fainter and more distant objects.
By using telescopes with greater light-gathering power and higher resolution, astronomers can collect more light and obtain clearer images of celestial objects. This allows them to observe objects that were previously beyond the reach of older telescopes. With each new generation of telescopes, our ability to see further and explore the universe expands.
In addition to technological advancements, other factors can contribute to our ability to see more distant objects. These include improvements in data analysis techniques, the use of space-based observatories free from atmospheric interference, and the accumulation of observational data over time that helps refine our understanding of the cosmos.
So, while the speed of light remains constant, our ability to observe more distant objects in space is continually improving thanks to advancements in observational technology and techniques.