The task is an almost impossibly tall order with Hubble and JWST: such objects are simply too small and faint. But with a new cadre of gravitational-wave observatories, detecting the stirrings of some early cosmic arrivals—specifically, black holes—should be a cinch.
Last month the European Space Agency (ESA) approved the latest milestone in this era, a 1.5 billion ($1.6 billion) space observatory called the Laser Interferometer Space Antenna (LISA).
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