When scientists adjust their readings to account for known sources of light and objects that may be present but not directly visible, they are often trying to understand the nature of any remaining light detected. Here are a few possibilities for the origin of this light in deep space:
Background radiation: The universe itself emits a faint background radiation known as the cosmic microwave background (CMB). This radiation is leftover from the early stages of the universe, specifically from a time when the universe was hot and dense shortly after the Big Bang. The CMB is pervasive throughout space and can be detected and measured by sensitive instruments.
Distant galaxies and stars: The universe is filled with countless galaxies, each containing billions or even trillions of stars. Even at vast distances, the light from these galaxies and stars can reach us. However, the light may be extremely faint and require sensitive instruments or long exposure times to be detected.
Extragalactic objects: Beyond galaxies and stars, there are various other celestial objects that can emit light, such as quasars, active galactic nuclei, and pulsars. These objects can be incredibly energetic and produce intense radiation, including visible light and other forms of electromagnetic radiation.
Gravitational lensing: The bending of light by the gravitational pull of massive objects, such as galaxies or galaxy clusters, can create lensing effects. This gravitational lensing can amplify and distort the light from more distant objects, making them visible or detectable even if they would otherwise be too faint or obscured.
Unknown phenomena: There may be undiscovered or poorly understood sources of light in the universe. As our knowledge and observational capabilities continue to improve, scientists may uncover new types of celestial objects or phenomena that contribute to the observed light in deep space.
It is important to note that the exploration and understanding of light in deep space is an ongoing scientific endeavor, and new discoveries continue to expand our knowledge of the cosmos.