The best possible achievment of a human is to learn. Knowledge is the key. What you learn has to be examined with an open mind, being liberal. I will not follow someone who simply writes a book and tells you it's facts.
Everyone claims to be an expert and that is impossible because there is always another piece to a puzzle. A simple example, 1+1=2? Then why are fractions in between endless.
"Expert" astronomers and scientists a few decades ago said there are no other planets except in our solar system. I laughed and scoffed at the idea because common sense comes into play. Why should our solar system only have planets and no other galaxy has them?, (or in our galaxy for that matter). Carl Sagan said it best. (Please this is not a quote but remembering Cosmos), Out of the trillions of galaxies in our universe, in each of them are billions of stars, in them are countless solar systems and planets. How could humans have the audacity to think we are the only life in the universe.
Well because scientists couldn't see planets, they could not exist. Well guess what, now they do because they can see them wobble from stars. Technology is still growing. I just wish it was made more for searching the universe for new answers instead of everyone worried about getting their Ipod or cell phone for thier birthday.
I think even decades ago some scientists would have thought there were planets outside our solar system...They would have been smart enough to keep it down low until there was the technology to confirm it, otherwise everyone would have called them crazy. Just like there would have been people who knew the Earth was round in a time when society just wasn't ready to hear it yet
I suppose being an expert isn't a definite term. Instead we should just use it to describe who is the best at something at a given time period. The facts we know today might be written in decades to come. But for now our "expert" scientists are the best we got
800BC Greek mythology knew of at least 5 planets in our solar system. Think about it, no telescopes that we know of or any modern technology, but they knew the sun, called Helios, and some planets with names that represented some of the gods. Eosphorus, Pyroeis, Stilbon, Phainon and Phaethon. This was astra planeta.
Truth be known though, it's true. In the late 1970's to around mid 1990's the scientists didn't believe there were planets outside our solar system. By using high math calculations and different light spectrums, they were able to see a wobble effect, showing that planets are indeed circling suns light years from earth. Now the technology reveals many earth-like planets. If we will ever go there, who knows. The thing is, how did the Greeks know?
The Greeks knew there were other planets in our own Solar System since they saw that some of the "stars" in the sky changed positions after some time (which indeed were planets but they probably assumed they were stars until they noticed the movement) The actual stars always remain in a fixed spot relative to each other, but they noticed how some of those points of light moved and that's how they would have identified them as planets even without telescopes