Modern science is based on positivism. Positivism says that there is no difference between something that doesn't exist and something that exists and hasn't been observed. So modern science says the extent of our universe is only those things which we observe. This seems illogical to me. I won't even go into the extent at which our science is dominated by the elite that decide what 'knowledge' appears in our text books and scientific journals. Remember positivism, there is no man behind the curtain until you observe him.