In 1972, the worst chaos of the Cultural Revolution was over and scientific research resumed. Fang found an opportunity to read some recent astrophysics papers in western journals, and soon wrote his first paper on cosmology, "A Cosmological Solution in Scalar-tensor Theory with Mass and Blackbody Radiation", which was published on the journal
Wu Li (Physics), Vol. 1, 163 (1972). This was the first modern cosmological research paper in mainland China. Fang assembled a group of young faculty members of USTC around him to conduct astrophysics research. At the time, conducting research on relativity theory and cosmology in China was very risky politically, because these theories were considered to be "idealistic" theories in contradiction with
dialectical materialism, a central component of the Communist Party's ideology. According to the dialectical materialism philosophy, both time and space must be infinite, while the
Big Bang theory allows the possibility of the finiteness of space and time. During the Cultural Revolution, campaigns were waged against
Albert Einstein and the Theory of Relativity in Beijing and Shanghai. Once Fang published his theory, some of the critics of the Theory of Relativity, especially a group based in Shanghai, prepared to attack Fang politically. However, by this time the "leftist" line was declining in the Chinese academia. Professor Dai Wensai, the most well-known Chinese astronomer at the time and chair of the Astronomy Department of
Nanjing University, also supported Fang. Many of the members of the "Theory of Relativity Criticism Group" changed to study the theory and conduct research in it. Subsequently, Fang was regarded as the father of cosmological research in China. Fang published a large number of papers on astrophysics and cosmology. In the late 1970s, he and his group used the luminosity of selected radio
quasars to measure the
Hubble diagram, and with data available at the time, suggested that the universe may be closed (Fang
et al.,
Acta Astronomica Sinica 17, 134 (1977)). This work was noticed by researchers outside China; a
Nature article noted that it obtained similar results to, but appeared earlier than, the paper by Davidsen
et al.,
Nature 269, 203 (1977). Fang also carried out research on topics including
neutron stars,
black holes,
inflation and
quantum cosmology. He soon gained international recognition, and as China began to open up in the late 1970s, he was invited to international conferences outside the country. In 1985, together with H. Sato of Kyoto University, Japan, Fang won the first prize of the
Gravity Research Foundation essay competition by proposing that the periodic distribution of quasars observed can be explained if the Universe is multiply-connected, i.e. has a non-trivial
topology. He was elected as the youngest member of the
Chinese Academy of Sciences in 1980. His membership was, however, revoked after the
Tiananmen Square protest of 1989. He helped promote international academic exchange in China. Together with
Remo Ruffini, he organized the first major international scientific conference in China: the 3rd
Marcel Grossmann meeting in 1982. During this meeting,
Tsvi Piran and T.G. Horowitz became the first two
Israeli scientists to enter the
People's Republic of China; at the time, there were no diplomatic relations between China and Israel. He invited
Stephen Hawking to visit China in 1985, and organized the
International Astronomical Union conference IAU-124 on "Observational Cosmology" in Beijing in 1986. Fang also trained many younger colleagues and students in the field of astrophysics and cosmology; he was considered an excellent teacher. Fang and Li coauthored "Introduction to Mechanics", an introductory book on Newtonian mechanics and special theory of relativity. This book has been considered a classic by many teachers and students, although few students are aware of it in recent years. Fang was also the first scientist in China to write popular accounts of contemporary astrophysical developments, such as cosmology and black holes. Fang's book, "Creation of the Universe" (Yuzhou de chuangsheng in Chinese) which was published in 1987, introduced basic cosmological ideas, and influenced a large number of physics and astronomy students growing up in the 1980s in China. ==Political activism==