Kepler -90 planetary system is a kind of solar system, located in Tianlong star, about 2545 light years away from the earth. It has been found that it has eight planets, the same as the number of planets in the solar system, and it is the planetary system with the largest number of planets except the solar system.

Life common sense refers to the scientific knowledge summarized by people in daily life, which can be divided into physics, biology, chemistry, medicine, first aid knowledge, geography, safety, cosmic celestial bodies, natural phenomena and other common sense contents.