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  2. Exponential growth - Wikipedia

    en.wikipedia.org/wiki/Exponential_growth

    After one hour, or six ten-minute intervals, there would be sixty-four bacteria. Many pairs (b, τ) of a dimensionless non-negative number b and an amount of time τ (a physical quantity which can be expressed as the product of a number of units and a unit of time) represent the same growth rate, with τ proportional to log b.

  3. Hubble's law - Wikipedia

    en.wikipedia.org/wiki/Hubble's_law

    It is equivalent to 4,420 million parsecs or 14.4 billion light years. (The numerical value of the Hubble length in light years is, by definition, equal to that of the Hubble time in years.) Substituting D = cH −1 into the equation for Hubble's law, v = H 0 D reveals that the Hubble distance specifies the distance from our location to those ...

  4. Photoperiodism - Wikipedia

    en.wikipedia.org/wiki/Photoperiodism

    These plants typically flower during late spring or early summer as days are getting longer. In the northern hemisphere, the longest day of the year (summer solstice) is on or about 21 June. [14] After that date, days grow shorter (i.e. nights grow longer) until 21 December (the winter solstice). This situation is reversed in the southern ...

  5. List of dates predicted for apocalyptic events - Wikipedia

    en.wikipedia.org/wiki/List_of_dates_predicted...

    The lack of oxygen-producing plants will cause free oxygen in the atmosphere to disappear, making animal life impossible. [211] 1–5 billion Various The estimated end of the Sun's current phase of development, after which it will swell into a red giant, either scorching or swallowing Earth, will occur around five billion years from now ...

  6. Age of the universe - Wikipedia

    en.wikipedia.org/wiki/Age_of_the_universe

    The age of the universe based on the best fit to Planck 2018 data alone is 13.787 ± 0.020 billion years. This number represents an accurate "direct" measurement of the age of the universe, in contrast to other methods that typically involve Hubble's law and the age of the oldest stars in globular clusters. It is possible to use different ...

  7. Earth has been habitable for billions of years — simulations ...

    www.aol.com/earth-habitable-billions-years...

    So to understand how we came to exist on planet Earth, we'll need to know how Earth managed to stay fit for life for billions of years. Earth has been habitable for billions of years ...

  8. Opinion: 25 years later, ‘The Matrix’ is less sci-fi than ...

    www.aol.com/opinion-25-years-later-matrix...

    The logic, then, is that if any civilization ever reaches this point, it would create not just one but a very large number of simulations (perhaps billions), each with billions of AI characters ...

  9. Doubling time - Wikipedia

    en.wikipedia.org/wiki/Doubling_time

    For example, with an annual growth rate of 4.8% the doubling time is 14.78 years, and a doubling time of 10 years corresponds to a growth rate between 7% and 7.5% (actually about 7.18%). When applied to the constant growth in consumption of a resource, the total amount consumed in one doubling period equals the total amount consumed in all ...