- #1
PhDnotForMe
- 56
- 3
So I know that we believe that most galaxies are moving with a high velocity away from us. We also know that the galaxies are accelerating away from us (not only that, but they are jerking away from us as well, as in the value of the acceleration away from us is increasing), and we use dark energy to explain this.
My question is what do we see with our telescopes? How do we see these galaxies behave? The speed of light is constant, but the distance between us and the galaxies is increasing, thus the photons take longer and longer to get to us, thus the position of the galaxy we see is getting farther and farther from the actual location of the galaxy (ex. light takes 8 minutes to get from the sun to earth, and so if we increase the distance between the sun and the earth, then the time the light takes to get to us would increase and therefore the angle between where we see the sun and where the sun actually is would increase if the sun kept its angular velocity with respect to us constant throughout)
This question is confusing, but hopefully someone understands what I am getting at. Do we have to interpret the behavior of the galaxies that we see or is what we see an accurate representation of what is actually happening.
My question is what do we see with our telescopes? How do we see these galaxies behave? The speed of light is constant, but the distance between us and the galaxies is increasing, thus the photons take longer and longer to get to us, thus the position of the galaxy we see is getting farther and farther from the actual location of the galaxy (ex. light takes 8 minutes to get from the sun to earth, and so if we increase the distance between the sun and the earth, then the time the light takes to get to us would increase and therefore the angle between where we see the sun and where the sun actually is would increase if the sun kept its angular velocity with respect to us constant throughout)
This question is confusing, but hopefully someone understands what I am getting at. Do we have to interpret the behavior of the galaxies that we see or is what we see an accurate representation of what is actually happening.