Thanks to gigantic telescopes, humans think they know a lot about the universe these days. However, nothing is truly certain in astronomy and science in general.
Understanding comes in small increments, slowly and arduously gained from painstaking research.
Thus, every discovery about the universe is incorrect to some degree. We must take comfort in the assumption that each new assertion seems a little less incorrect than the one before. As late as 100 years ago, humans knew practically nothing about Earth's nearest neighbor, our our only natural satellite, the moon. Based on the best available evidence, even brightest astronomers made claims about the moon that seem in retrospect to be exceedingly weird. If you don't believe me, grab a small telescope and look at the crater Eratosthenes.