The interpretation of observations is what yields distances. The cosmic ladder is used in the math. The parallax for example, and the standard candles etc.
dad, astronomers, and I am talking about professional astronomers these days, used advanced technology and computers to do all their measurements, all their calculations, so it minimized much of human errors.
And the measurements far more precise than ever before, reducing the margin of errors to even smaller figures or percentages, than when they did 30 or 40 or 50 years ago.
When they first used radio telescope, in 1964, the Cosmic Microwave Background Radiation (CMBR) was accidentally discovered by Robert Wilson and Arno Penzias. At first they didn’t what the sources of this background radiation was come from, and began the process of elimination, first every possible terrestrial electromagnetic sources or noises or interference. But eventually they began deducting that it might be coming from deep space.
Their discovery led to more powerful radio telescopes to detect and measure the universe’s CMBR. Eventually the first microwave anisotropic capable observatory satellite was launched in 1989. The Cosmic Background Explorer (or COBE) was launched by NASA.
It gave better imagery and measurements than any terrestrial radio observatories, but it wasn’t as accurate as two other more powerful satellites -
- Wilkinson Microwave Anisotropy Probe (WMAP), 2001, from NASA.
- and the Planck spacecraft, 2009, from ESA (European Space Agency)
They detect very extreme redshifted residual radiation left when the universe was young.
The CMBR was first postulated and predicted back in 1948 by the theoretical astrophysicists, Ralph Alpher and Robert Herman, and were also working with another astrophysicist George Gamow on Primordial Nucleosynthesis, now called the Big Bang Nucleosynthesis (BBN).
The CMBR discovery was the best evidence of the Big Bang theory of the young universe, before the formation of the earliest generation of stars. The CMBR occurred in the Big Bang timeline in the Recombination Epoch, which started 377,000 years after the Big Bang (the beginning of expansion of the universe).
Recombination Epoch was a time when the earliest time when electrons bonded with ionized hydrogen and ionized helium for the first time. This bonding decoupled light, which over the billion of years caused the light redshifted to EM spectrum of microwave.
The CMBR is the oldest detectable light, older than the first quasars, older than the oldest detectable stars.
My point about CMBR, is that from its discovery to present day, the devices used to detect and measure background radiation have becoming increasing accurate and precise. The evidences are not left to human chances of making errors.
If humans were left to do the measurements and calculations without computers, I might have agreed with you. But you are so backward and ignorant, because you have ignored that both optical and radio telescopes used computers to provide more accurate detection, measurements and calculations.
You are living in the 21st century, dad, for goodness sake. How about you actually reading scientific sources than using your bizarre and twisted logic.