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  • This artist's rendering shows the Arcus telescope, a proposed X-ray mission concept has been selected for a "Phase A" study as part of the $250 million Medium-Class Explorer (MIDEX) program. Credit:

    This artist's rendering shows the Arcus telescope, a proposed X-ray mission concept has been selected for a "Phase A" study as part of the $250 million Medium-Class Explorer (MIDEX) program. Credit:

    SAO/Orbital ATK