There have been many achievments in the ASCA program including
(1) Gravitational effect of massive black hole
(2) Identification of particle acceleration sites
(3) The origin of cosmic X-ray background
(4) Signature of black hole in our galaxy
(5) Explanation of chemical evolution in the universe
(6) Discovery of a dark cluster of galaxies
(7) Distribution and total mass of dark matter
(8) Evolution of X-ray celestial bodies and deep space
(9) X-ray observation of supernova explosion
(10) Rich environment in supernova remnant Cas A