Basically the answer is forever!
You can actually see the left over from the Big Bang, which happened 15 billion years ago! That's how old is the oldest light.
This being said, there are some theories that mentions that this is only part of the universe.
The only limitation is when light get absorbed (black hole) and hit an object (Earth) that reflects only part of it
The question of how long and how far sunlight travels in the universe depends on the context in which it is asked. Here are a couple of interpretations:
1. Travel Time of Sunlight: The sunlight emitted from the Sun takes approximately 8 minutes and 20 seconds to reach Earth, covering a distance of about 93 million miles (150 million kilometers). This is because light travels at a speed of approximately 186,282 miles per second (299,792 kilometers per second) in a vacuum.
2. Extent of Sunlight in the Universe: When considering the vastness of the universe, sunlight radiates outward in all directions from the Sun. However, it eventually disperses and weakens as it travels through space. The intensity of sunlight diminishes with distance due to factors like the inverse square law, scattering, and absorption by interstellar dust and gas.
The reach of sunlight in the universe is effectively limitless, as it continues to propagate through space until it encounters objects or media that either absorb or scatter the light. It is worth noting that the universe is composed of various galaxies, nebulae, and other structures that can block or affect the transmission of light over long distances.
In summary, sunlight from the Sun reaches Earth in approximately 8 minutes and 20 seconds, but its extent throughout the universe depends on the specific conditions and obstructions it encounters along its journey.
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