Ellipses (椭圆) are used to describe the motions of the planets around the sun.
举一反三
- The little boy is wondering whether it is true that all the planets all _____ around the sun in the same direction.
- According to Newton's principle ______. A: the force of gravity keeps planets orbiting around the sun rather than flying off B: the sun is the most massive object, making up 99.8 percent of the mass of the solar system C: the amount of mass determine how fast the objects travel as they orbit each other D: Pluto receives the least force of gravity from the sun of all the planets in the solar system
- The earth __________ (move) around the sun.
- The earth __________(be) round. It _________(run) around the sun.
- 中国大学MOOC: At the peak of its power, the phrase "the empire on which the sun never sets" was often used to describe the British Empire.