telescope objective diameter light gathering eyepiece magnification

A telescope’s main job is gathering light

A telescope’s main light-collecting part gathers light, and its diameter determines how much it can collect. Changing the eyepiece changes magnification. That is why telescopes are commonly described by the diameter of their light-collecting part, not just by how much they magnify.

Dreams can seem predictive because we remember the hits

People tend to remember dreams that seem to predict later events and forget the many dreams that do not. In experiments where dreams were written down before the outcome was known, they did not accurately predict the future.

Japan had widespread schooling before modernization

Before Japan's Meiji modernization, commoner education was already widespread. By the end of Tokugawa rule, more than 11,000 terakoya schools had 750,000 students. In the 1860s, an estimated 40–50% of boys and 15% of girls had some schooling outside the home—rates comparable to major European nations apart from Germany.

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telescope objective diameter light gathering eyepiece magnification

A telescope’s main job is gathering light

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