A unit of time equal to one billion seconds, approximately 31.7 years.
From the prefix 'giga-' (representing 10^9 in the metric system, from Greek 'gigas') + 'second' (the base unit of time). The metric prefix was standardized in 1960 by the International System of Units.
A gigasecond is oddly long for a practical measurement—it's why we don't use it much in daily life—but it perfectly illustrates how science creates precise vocabulary for any scale imaginable, from nanoseconds to gigaseconds!
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