A small US satellite, known in full as Array of Low-Energy X-ray Imaging Sensors, which carried six wide-angle telescopes to survey the sky at ultrasoft X-ray and extreme ultraviolet wavelengths. It also contained a broadband VHF ionospheric survey experiment called Blackbeard. ALEXIS was launched by a Pegasus booster on 25 April 1993 from the wing of a B-52. It operated successfully for 12 years and exceeded all expectations. The satellite was decommissioned on 29 April 2005.