At the urging of Rossi, Annis brought on board Riccardo Giacconi, from Italy, to work on the effort to develop a detector.

As a consultant to American Science and Engineering, Inc., Rossi initiated the rocket experiments that discovered the first extra-solar source of X-rays, Scorpius X-1.

The AS&E team made possible the Einstein Observatory (equipped with the first full imaging X-ray telescope on board a satellite, launched in 1978).

These observations enabled major steps forward in our understanding of the physics of the solar corona and of plasma astrophysics in general.

[4] In June 2016, OSI Systems offered to purchase the company for $269 million, After approval by regulators and shareholders, the deal competed before the end of 2016.