太陽 — 何であり、どう回るか
NASA Science Editorial Team · 2024
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NASA が太陽とは何かに名を与え、どこにあるかを置き、そのうえで太陽の「一日」がなぜひとつでないかを説明します。文ごとに事実はひとつで、難しいところは平易な文が道を作ったあとに来ます。
この文章で練習すること
- 01一文に事実をひとつだけ入れる
- 02数に読み手がすでに持つ比較を添える
- 03難しい問いは、その対象をまず定義してから答える
準備済みの英文
161 語 · 11 文Our Sun is a 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium – at the center of our solar system. It’s about 93 million miles (150 million kilometers) from Earth and it’s our solar system’s only star. Without the Sun’s energy, life as we know it could not exist on our home planet.
The Sun is the only star in our solar system. It is the center of our solar system, and its gravity holds the solar system together. Everything in our solar system revolves around it – the planets, asteroids, comets, and tiny bits of space debris.
Measuring a “day” on the Sun is complicated. The Sun is made of super-hot, electrically charged gas called plasma. This plasma rotates at different speeds on different parts of the Sun. At its equator, the Sun completes one rotation in 25 Earth days. At its poles, the Sun rotates once on its axis every 36 Earth days.
出典と権利
A work of the United States federal government, which carries no copyright in the United States under 17 U.S.C. §105. Scripta reproduces the wording as published and normalizes only typography.