Most of the backgrounds include some free technology unlocks. Astrogeologist background includes the unlock for deep scanning. Unlike the other technological unlocks, however, deep scanning is not immediately usable; you have to go back and re-scan everywhere you already scanned using the less-deep scanning process before.
However, if you choose Astrogeologist as your initial background, you can get the deep scan of the map the first time, and not have to re-do it once the tech gets unlocked. Also, you will know ahead of time where all the deep deposits are, so they'll be clear (of, say, that inconvenient dome you placed there earlier) when you finally achieve the ability to exploit them.
However, if you choose Astrogeologist as your initial background, you can get the deep scan of the map the first time, and not have to re-do it once the tech gets unlocked. Also, you will know ahead of time where all the deep deposits are, so they'll be clear (of, say, that inconvenient dome you placed there earlier) when you finally achieve the ability to exploit them.
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