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People have studied the sky since the dawn of civilisation, yet the bulk of what is out there is still unknown. |
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If people had studied the sky throughout civilised times, the bulk of what is out there would now have been known. |
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People were studying the sky even before the dawn of civilisation, but little was known about what was out there. |
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A large portion of space remains unexplored though man has been interested in it since the dawn of civilisation. |
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The sky has been under observation ever since civilisation began, but not much is known about it. |