The estimated diameter of the observable universe is said to be about 93 billion light years. Is there more beyond what can be observed? Do we really comprehend how big 93 billion light years is? The distance to the closest star is 4 1/3 light years.
To put things into perspective: Alpha Centauri is trillions of miles away from Earth. Its distance of 4.3 light-years equals 25.6 trillion miles away - nearly 300,000 times the distance from the Earth to the sun. Traveling from the Earth at a speed of about 17,600 mph, it would take about 165,000 years to reach Alpha Centauri. It would supposedly take 93 billion years for light to get here from the far reaches of space if the light was traveling at 186,000 miles per second.
Assumptions about starlight and time that may not be true:
1. Light has always traveled at the same speed.
2. Time flows at the same rate in all conditions.
3. All phenomena can be explained in terms of natural laws.