What is Terasecond and longer?
A '''terasecond''' (symbol: '''Ts''') is one [[Names for large numbers|trillion]] [[second]]s. That is about 31,700 years. It can be written as '''10<sup>12</sup> seconds'''. Here is a list of time spans longer than 1 terasecond: * 10<sup>15</sup> seconds = 1 ''petasecond'' = 31.7 million years * 10<sup>18</sup> seconds = 1 ''exasecond'' = 31.7 billion years * 10<sup>21</sup> seconds = 1 ''zettasecond'' = 31.7 trillion years * 10<sup>24</sup> seconds = 1 ''yottasecond'' = 31.7 quadrillion years * 10<sup>27</sup> seconds = 1 ''ronnasecond'' = 31.7 quintillion years * 10<sup>30</sup> seconds = 1 ''quettasecond'' = 31.7 sextillion years == Teraseconds == Here are some examples of events that take this long: * 75,000 years — time since the ancestors of the [[Indigenous Australians]] reached [[Australia]] * 76,000 years — [[Half-life (element)|half-life]] of [[nickel]]-59 * 154,000 years — half-life of [[neptunium]]-236 * 159,200 years — half-life of [[uranium]]-233 * 200,000 years — age of ''[[Homo sapiens]]'' * 211,100 years — half-life of [[technetium]]-99 * 250,000 years — age of ''[[Homo neanderthalensis]]'' * 301,000 years — half-life of [[chlorine]]-36 * 340,000 years -- half-life of [[curium]]-248 * 379,000 years -- time after the [[Big Bang]] until [[cosmic microwave background radiation]] began * ~700,000 years -- time since the [[earth's magnetic field]] last changed * 1,000,000 years -- the lifespan of a [[blue supergiant]] [[star]] * 1,530,000 years -- half-life of [[zirconium]]-93 * 2,600,000 years -- amount of time the [[Paleolithic]] era lasted * 2,600,000 years -- half-life of [[technetium]]-97 * 3.74 million years -- half-life of [[manganese]]-53 * 4 million years -- time since the last [[ice age]] * 4.2 million years -- half-life of [[technetium]]-98 * 6.5 million years -- half-life of [[palladium]]-107 * 15.6 million years -- half-life of [[curium]]-247 * 20 million years -- time since the first forms of grass appeared * 23.42 million years -- half-life of [[uranium]]-236 * 26 million years --