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Originally posted by Nightfury
One more thing...
To observe distance, you need to have a perception of depth. That's why we have 2 eyes and a person with only 1 eye, can't percieve depth, so they can't tell distance, so how can they tell the distance by looking through a telescope?
Don't tell me they read it with a range finder by shooting a laser and waiting or it to bounce back,,, 50 million light years might make for a long wait..
So how do they know the distance?
The part that has always baffled me, is that the further/older those objects appear, the faster those objects appear to be moving away from us. Paradoxically, from that they conclude that the expansion of the universe is increasing. What? That makes no sense. If the more recent information/closer objects appear to be moving slow means the expansion is actually slowing down (past-->fast + recent-->slow = expansion is slowing)!!!!!!!
excellent post devino, I think you answered the OP question well and I agree with your post up to the part I quoted.
Originally posted by Devino
It is said that the Universe is 13-15 billion years old yet we measure some objects at over 40-50 billion light years away. One of these measurements must be wrong yet that's not how cosmologists deal with this problem. They add in a factitious factor called "Lookback Time" which again, like the big bang theory, is in violation of physics and relativity.
That summary should give you an idea about what's in the article, it describes all the measurement techniques at each rung of the ladder in detail.
The cosmic distance ladder (also known as the Extragalactic Distance Scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement to an astronomical object is only possible for those objects that are "close enough" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances with methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.
The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.
What objects have been measured at 40-50 billion light years away?
I also don't understand why you would say lookback time is in violation of physics and relativity.
The current comoving distance to the particles which emitted the CMBR, representing the radius of the visible universe, is calculated to be about 14 billion parsecs (45.7 billion light years), while the current comoving distance to the edge of the observable universe is calculated to be 14.3 billion parsecs (46.6 billion light years)
Current interpretations of astronomical observations indicate that the age of the universe is 13.75 ±0.17 billion years, and that the diameter of the observable universe is at least 93 billion light years, or 8.80 × 1026 metres. According to general relativity, space can expand faster than the speed of light, although we can view only a small portion of the universe due to the limitation imposed by light speed.
The metric expansion of space is the increase of distance between distant objects in the universe with time.
It is an intrinsic expansion—that is, it is defined by the relative separation of parts of the universe and not by motion "outward" into preexisting space. (In other words, the universe is not expanding "into" anything outside of itself).
Source same as above.
While special relativity constrains objects in the universe from moving faster than the speed of light with respect to each other, there is no such theoretical constraint when space itself is expanding. It is thus possible for two very distant objects to be moving away from each other at a speed greater than the speed of light