The short poem about dusk is as follows:
1. The painting hall is noisy with singing and dancing, and no one comes and goes to the society. I have been with you in the river tower for a long time, and I am still waiting to lean on the railing at dusk. ——Du Mu's "Returning to the Swallow"
2. At dusk, the tide falls and the sand is bright in the south, and the moonlight covers the sand and the autumn snow clears. There is no water, no smoke, and the plain jade fields are cold and empty. ——Bao Rong's "Moon on the Sand".
Twilight introduction:
The Sun is the central object of the solar system, accounting for 99.86% of the total mass of the solar system. The eight major planets, asteroids, meteors, comets, trans-Neptunian objects, and interstellar dust in the solar system all orbit the sun, and the sun orbits the center of the Milky Way. The sun is the star located at the center of the solar system. It is almost an ideal sphere where hot plasma and magnetic fields are intertwined.
The diameter of the sun is approximately 1,392,000 (1.392 × 10?) kilometers, which is equivalent to 109 times the diameter of the Earth; its volume is approximately 1.3 million times that of the Earth; its mass is approximately 2 × 10? kilograms (the Earth’s 330,000 times). Judging from the chemical composition, about three-quarters of the mass of the sun is hydrogen, and the rest is almost helium, including oxygen, carbon, neon, iron and other heavy elements with less than 2% mass.
Using nuclear fusion to release light and heat into space. The Sun is currently passing through the Local Interstellar Cloud in the Local Bubble region of the Orion Arm at the inner edge of the Milky Way. There are 50 nearest star systems within 17 light-years of Earth (the closest star to the Sun is a red dwarf called Proxima Centauri, about 4.2 light-years away).
Expansion:
The sun is a yellow dwarf star (spectrum G2V). The lifespan of a yellow dwarf star is approximately 10 billion years. The current sun is about 4.57 billion years old. In about 5 to 6 billion years, the hydrogen inside the sun will be almost completely exhausted, and the sun's core will collapse, causing the temperature to rise. This process will continue until the sun begins to fuse helium into carbon.
Although helium fusion produces less energy than hydrogen fusion, it is also hotter, so the outer layers of the sun will expand and release some of the outer atmosphere into space. When the transition to new elements is complete, the Sun's mass will have dropped slightly, and its outer layers will have extended to the current orbits of Earth or Mars (which will then be further away from the Sun due to the Sun's reduced mass).