The first volume of the fifth grade1class 6: Sun Zuci

Photo: (photography, intake, degrees Celsius)

Surname: (surname, clan, surname)

Colonization: (colonization, reproduction, reproduction)

Grain: (grain, granary, hay)

Charcoal: (coal, bamboo charcoal, charcoal)

Region: (region, community, department)

Kill: (sterilize, kill the enemy)

Bacteria: (bacteria, germs, fungi)

Treatment: (treatment, recuperation, curative effect)

Introduction to the sun:

The sun is the central celestial body of the solar system, accounting for 99.86% of the total mass of the solar system. The eight planets, asteroids, meteors, comets, exoneptune objects and interstellar dust in the solar system all revolve around the sun, and the sun revolves around the center of the Milky Way.

According to the relative strength of solar activity, the sun can be divided into two categories: calm sun and active sun. The quiet sun is a spherically symmetric balloon, which should be quiet in theory. Its properties only change with radius and are consistent on any sphere. Its purpose is to study the overall structure and general properties of the sun. Under this assumption, according to the order from inside to outside, the sun consists of core, radiation belt, troposphere, photosphere, chromosphere and corona. The photosphere is hereinafter called the interior of the sun; Above the photosphere is called the solar atmosphere.