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What astronomers rely basically on, as all scientists do, is observations that guide them in theorizing and verifying theories already developed. |
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Astronomers rely heavily on observations to guide them in theorizing and verifying theories developed before, which is what all scientists do indeed. |
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Astronomers, like all scientists, rely heavily on observations to guide them in theorizing and verifying theories already developed. |
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As all scientists do, astronomers rely basically on observations to guide them in theorizing and verifying theories developed earlier. |
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Like all scientists, astronomers rely mainly on observations in theorizing and verifying existing theories, as observations guide them well. |