- Solar System (Wikipedia)
The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. The largest of such objects are the eight planets, in order from the Sun: four terrestrial planets named Mercury, Venus, Earth and Mars, two gas giants named Jupiter and Saturn, and two ice giants named Uranus and Neptune. The terrestrial planets have a definite surface and are mostly made of rock and metal. The gas giants are mostly made of hydrogen and helium, while the ice giants are mostly made of ‘volatile’ substances such as water, ammonia, and methane. In some texts, these terrestrial and giant planets are called the inner Solar System and outer Solar System planets respectively.
- In atomic physics, the Bohr model or Rutherford–Bohr model is an obsolete model of the atom, presented by Niels Bohr and Ernest Rutherford in 1913. It consists of a small, dense nucleus surrounded by orbiting electrons. It is analogous to the structure of the Solar System, but with attraction provided by electrostatic force rather than gravity, and with the electron energies quantized (assuming only discrete values).
- Taoism (Wikipedia)
Taoism or Daoism (/ˈtaʊɪzəm/ or /ˈdaʊɪzəm/) refers to a set of Chinese traditions and religions which emphasize living in harmony with the Tao (Chinese: 道; pinyin: Dào; Wade–Giles: Tao; lit. ‘Way’, ‘Path’). The Tao is generally defined as the source of everything and the ultimate principle underlying reality. The Tao Te Ching and the Zhuangzi are widely considered key Taoist texts.
