Essential triangle replotted

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Possible Answers:

INTEGRAL.

Last seen on: The Sun – Two Speed Crossword – Dec 24 2019

Random information on the term “INTEGRAL”:

X-ray telescopes are designed to observe the x-ray region of the electromagnetic spectrum. X-rays from outer space cannot be observed from the ground due to absorption by the atmosphere, and so x-ray telescopes must be launched into orbit. Their mirrors require a very low angle of reflection (typically 10 arc-minutes to 2 degrees). These are called glancing (or grazing) incidence mirrors. In 1952, Hans Wolter outlined three ways a telescope could be built using only this kind of mirror.

This list contains space-borne observatories as well as X-ray instruments as part of a larger mission, both past, present and in the proposal stage.

Sometimes X-Ray observations are made from a near-space environment on sounding rockets or high-altitude balloons.

Skylab S-54 instrument, an X-ray telescope

Chandra (AXAF) checks out a pulsar with its focusing X-ray optics

NuStar’s lens for focusing X-rays

Wolter telescopes of Types I, II, and III

INTEGRAL on Wikipedia