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Mickeydee
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if light is affected by gravity (ie. bend, stretch, curve) inconsistent.
why do we measure distance in lightyear?
why do we measure distance in lightyear?
Space is flat between galaxies and overall (mainly) in the observable universe so it makes sense to measure this way given the enormous distances.Mickeydee said:if light is affected by gravity (ie. bend, stretch, curve) inconsistent.
why do we measure distance in lightyear?
In modern physics the second has a definition and light speed is defined to be ##299,792 km/s##.Mickeydee said:if light is affected by gravity (ie. bend, stretch, curve) inconsistent.
why do we measure distance in lightyear?
you seem to think of the Shapiro time delay. But if light crosses the whole milky way thereby passing near stars happens extremely seldom presumably.Mickeydee said:if light is affected by gravity (ie. bend, stretch, curve) inconsistent.
why do we measure distance in lightyear?
Mickeydee said:if light is affected by gravity (ie. bend, stretch, curve) inconsistent.
why do we measure distance in lightyear?
This could be misunderstood by the OP. I'd prefer to say how far it was away at the time of emission, if we talk about galaxies which recede with the Hubble flow.FactChecker said:It immediately tells us how far away it is and how long ago it was.
Good point. I edited it to be clearer.timmdeeg said:This could be misunderstood by the OP. I'd prefer to say how far it was away at the time of emission, if we talk about galaxies which recede with the Hubble flow.
A lightyear is a unit of measurement used to describe distance in space. It is the distance that light travels in one year, which is approximately 9.46 trillion kilometers or 5.88 trillion miles.
Lightyear distance is measured by multiplying the speed of light (299,792,458 meters per second) by the number of seconds in a year (31,557,600 seconds). This calculation results in a distance of approximately 9.46 trillion kilometers or 5.88 trillion miles.
Lightyear distance is important in space exploration because it allows us to understand the vastness of the universe and the distances between objects in space. It also helps us to measure and compare the distances of different celestial bodies and to determine how long it would take for us to travel to them.
According to the current laws of physics, nothing can travel faster than the speed of light. This is because the speed of light is the fastest speed at which energy, matter, and information can travel in our universe.
Lightyear distance has a significant impact on our understanding of time because it takes light time to travel from one point to another. This means that when we observe objects in space, we are actually seeing them as they were in the past. The further away an object is, the longer it takes for its light to reach us, and therefore, the further back in time we are seeing it.