Eli5. How its possible for the light to travel constantly with out stop slowing down from the most old galaxies?
In: Physics
Before we talk about light, your question is first answered by Newton’s first law of motion which is “things at rest stay at rest, things in motion stay in motion unless acted upon by a force.” Anything in space will continue to move forever if nothing hits it or is far away from other masses so as to no be affected by gravity. On earth, things are always hitting molecules. We are surrounded by air. Gravity from earth also brings us into contact with other matter which will slow things down to a stop. On earth, we contantly need energy to overcome friction and air resistance.
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