He was a participant in the launch of the first artificial satellite of the Earth and the first cosmonaut, candidate of technical sciences, docent, laureate of the Lenin (1960) and State (1979) Prizes, one of the leading managers of work in the field of experimental development of rocket technology OKB-1, personal pensioner of republican significance, student and interpersonal relationship of Sergei Korolev.

In his school years Arkady, together with his elder brother Yevgeny, under the leadership of the magazine "Knowledge is Power", designed and assembled a telescope with a 10-fold increase with the necessary bed and a mechanism of rotation in two planes, lenses for the eyepiece and the objective sent to the editorial Board of the journal free of charge.

After graduating from school, he studied for 2.5 months at preparatory courses at the Moscow Aviation Institute and passed exams according to the program of 10 classes, according to the results of which he was enrolled in the MAI named after S. Ordzhonikidze.

Ostashev managed to learn German documents on rocketry, obtained by a group of specialists sent by the country's leadership in Germany after the war.

All the scientific and engineering activities of Ostashev since 1948 connected with the development and introduction of the system of tests of missiles and rocket-space complexes.

Personal will and testament Arkady Ilyich Ostashev was cremated for burial in the grave of the elder brother Yevgeny.

In December 1998, after obtaining the relevant approvals and permits from the leadership of Kazakhstan dust Ostashev was moved by his wife and son to Baikonur (city) and buried in the grave of his older brother Yevgeny, who died on 24 October 1960 41 site [5] the Baikonur cosmodrome in preparation for the launch of Intercontinental ballistic missile R-16.

In Elektrougli, Noginsky District, Moscow region at the local history Museum has a booth dedicated to the Ostashev brothers.

In Moscow, the Memorial Museum of Cosmonautics stores personal belongings, photographs and documents from the home archive of A. I. Ostashev.

In the Museum of the RSC "Energia", where Ostashev worked for more than 50 years, there is material, dedicated to him (in the hall of "Labor Glory" the first showcase).

This ability to look from the side, being in the center of events, the wilful detachment allows to him, like the custodian of the great MYSTERIES of TIME, keep it to once share the secret, tell you first hand... And more.

Over the years, you realize that the most difficult thing in life, oddly enough, is the ability to be grateful to people, without the statute of limitations of the good done to you.

[2] In 1997, the American writer J.. Harford published the book «Korolev» [7], (John Wiley & Sons, Inc., New York City, 1997.)

After the death of Ostashev in 2001 and 2005 there were published two editions of his book «the Test of rocket and space technology business of my life.