摘要
以宇宙学原理和相对论为基础建立的宇宙的“标准模型”可以用投影法建立一个三维直观模型,为宇宙学、天文学提出一个教学、研究及科普工具.空间第四维是否存在是一个现实问题,它对引力性质及宇宙前途直接相关.
Space is given a definition with matter and separate matter space from geometric space. It is advantageous to know cosmic space. The model of standard universe can be made by means of projective geometry. Three-dimensional and audio-visual aids to serve teaching and scientific research and spread of Astronomy and Cosmology.Whether or not there is a 4th-dimensional matter space is an actual question and interrelated to the gravitational properties. Mankind can not feel 4th-dimensional. But the 4th-dimensional effect can help us to examine it.
关键词
宇宙
二维球体
投影模型
spinning freedom
two-dimensional spheroid
geodesic line
material space
