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There are two possible explanations for this 'slingshot' in space: kickback by a triple black hole system, or the effects of gravitational waves produced after two supermassive black holes merged a few million years earlier. The discovery of this object comes from a large, multi-wavelength survey, known as the Cosmic Evolution Survey (COSMOS). This survey includes data from Chandra, HST, XMM- Newton, as well as ground-based observatories. Of the 2,600 X-ray sources found in COSMOS, only one -- named CID-42 and located in a galaxy about 3.9 billion light years away -- coincides with two very close, compact optical sources. Image Credits: X-ray: NASA/CXC/SAO/F.Civano et al. Optical: NASA/STScI
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