Soviet probes <a href="https://en.wikipedia.org/wiki/Venera_11" id="mwARc" rel="mw:WikiLink" title="Venera 11">Venera 11</a>, <a href="https://en.wikipedia.org/wiki/Venera_12" id="mwARg" rel="mw:WikiLink" title="Venera 12">Venera 12</a> and the German-American solar satellite <a href="https://en.wikipedia.org/wiki/Helios_(spacecraft)" id="mwARk" rel="mw:WikiLink" title="Helios (spacecraft)">Helios II</a> all are hit by <a href="https://en.wikipedia.org/wiki/Gamma-ray_burst" id="mwARo" rel="mw:WikiLink" title="Gamma-ray burst">"off the scale" gamma rays</a> leading to the discovery of <a href="https://en.wikipedia.org/wiki/Soft_gamma_repeater" id="mwARs" rel="mw:WikiLink" title="Soft gamma repeater">soft gamma repeaters</a>.