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Many things which are hard to believe are nevertheless true.

Sure, but in this case, we don't know.

When Everest was first measured, it was exactly 29,000 feet.

They figured no one would believe this, so they told people it was 29,002 feet

Sometimes things just are, regardless of what we expect.

Waugh is sometimes playfully credited with being "the first person to put two feet on top of Mount Everest".

The "observable" universe is very small. We can take a look at things that are at the "ebd" of the universe, but those happened multiple billion years ago. Earth itself is 2-3 billion years old and life in terms of mammals is is a couple hundred million years old.

So to say, there may be another earth with human-like life. But it's so far away, life isn't here (therefore not observable) and life may already be gone there (but it will take another billion years until we can observe it).