Recently I realized something about the ending...
Hermes and his wife were there on the ship when it went into the wormhole, but I don't believe their son was on it. I don't think the Professor's clone was, either. Presumably, they were left alone on Earth without their parents- maybe permanently, since, as the Professor says, there's no knowing whether they'll ever return. So why do Hermes and his wife and the Professor cheer going through the wormhole when it might practically make their children orphans?
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