搜尋結果
1 天前 · In standard cosmological calculations, "matter" means any constituent of the universe whose energy density scales with the inverse cube of the scale factor, i.e., ρ ∝ a −3. This is in contrast to "radiation", which scales as the inverse fourth power of the scale factor ρ ∝ a −4, and a cosmological constant, which does not change with respect to a (ρ ∝ a 0).
2 天前 · Chinese ( simplified Chinese: 汉语; traditional Chinese: 漢語; pinyin: Hànyǔ; lit. ' Han language' or 中文; Zhōngwén; 'Chinese writing') is a group of languages [d] spoken natively by the ethnic Han Chinese majority and many minority ethnic groups in China. Approximately 1.35 billion people, or around 16% of the global population ...
- 1.35 billion (2022)