Long Time Intervals (1960)

The film explores the concept of time and the methods used to measure long intervals, particularly in relation to the Earth’s age. It discusses historical beliefs about the Earth’s age, contrasting them with modern scientific findings that suggest the Earth is billions of years old. The film introduces various “clocks” for measuring time, such as tree rings, sediment layers, and radioactive decay, particularly focusing on uranium isotopes. It explains how the decay of uranium isotopes can be used to determine the age of rocks and the Earth itself. Through scientific observation and measurements, it estimates the Earth’s age to be between 3.2 billion and 10 billion years, and discusses the nature of time itself, highlighting its complexity.

Keywords
time measurement, Earth’s age, radioactive decay, uranium isotopes, geological time, clocks, scientific observation, sediment layers, tree rings, historical beliefs, cosmic time

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