A primitive cell or embryonic tissue in astronomical or space-based research contexts; possibly a theoretical construct for studying life development in space environments.
Compound of astro- ('star' or 'space') and -blast (from Greek blastos, 'sprout' or 'germ'). This appears to be specialized scientific terminology, possibly theoretical or hypothetical.
If astroblasts were real, they'd be embryonic cells developing in microgravity—scientists actually grow frog and fish embryos in space stations to see how gravity affects life's blueprint.
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