April 19 – Aryabhata, India's first satellite, is launched using Soviet boosters.
July 17 – Apollo–Soyuz Test Project: An American Apollo and a Soviet Soyuz spacecraft dock with each other in orbit marking the first such link-up between spacecraft from the two nations.
John N. Mather and Richard McGehee prove that for the Newtonian collinear four-body problem there exist solutions which become unbounded in a finite time interval.^{[9]}^{[10]}^{[11]}
^Stefan (2010-07-28). "Happy 35th birthday, global warming!". RealClimate. Retrieved 2012-01-28. [Broecker's article is] the first of over 10,000 papers for this search term according to the ISI database of journal articles
^Harada, Koichiro (1976). "On the simple group F of order $2^{14}\cdot 3^{6}\cdot 5^{6}\cdot 7\cdot 11\cdot 19$". Proceedings of the Conference on Finite Groups (Univ. Utah, Park City, Utah, 1975). Boston, MA: Academic Press. pp. 119–276. MR0401904.
^Norton, Simon P. (1975). F and other simple groups. University of Cambridge: PhD Thesis.
^Mather, J. N.; McGehee, R. (1975). Solutions of the collinear four body problem which become unbounded in finite time. Lecture Notes in Physics. Vol. 38. pp. 573–597. doi:10.1007/3-540-07171-7_18. ISBN978-3-540-07171-6.