Final answer:
The night sky 1 million years from now will likely still be illuminated by galaxies and other celestial bodies that exist currently, although individual stars and galaxies may have changed. As light takes years to travel across space, we're always seeing a historical view of these celestial objects. Despite the evolutionary changes that take place in the cosmos, the universe will continue to provide a brilliant night sky for the foreseeable future.
Step-by-step explanation:
The potential source of light visible in the night sky 1 million years in the future will likely be galaxies and other celestial bodies, similar to what we see today. Light travels at an incomprehensible speed of over 186,000 miles per second, and thus, when we observe the night sky, we are looking into the past. For instance, the Andromeda galaxy's light takes 2 million years to reach us, so the view we have is of Andromeda 2 million years ago. It's important to remember that stars and galaxies are constantly evolving, with some forming new stars, others potentially going supernova, and some even merging or becoming black holes.
Eventually, there will be a time in the distant future where all stars have burnt out and galaxies go dark. Nevertheless, within the period of 1 million years, the substantial changes in the visible sources of light should be relatively modest, and stars and galaxies will continue to be major contributors to the night sky's illumination. While individual objects may fade or change due to cosmic events, combined light from countless other celestial objects will continue to reach Earth. The sky will be far from dark, as the universe has a vast reserve of stars and materials to form new stars, keeping the night sky aglow for eons to come.