The Dark Ages Radio Explorer (DARE) is a NASA spacecraft designed to investigate the early universe, between 80 million and 420 million years after the Big Bang. The observatory is placed in a lunar orbit, using the Moon's shadow to hide from the Sun's light and Earth's radio interference. DARE is 25 feet (7.5 metres) across when its antennae are fully extended. The craft's highly sensitive instruments can be used to measure redshifted emanations from primeval hydrogen atoms – revealing the moment when the first stars began to emit light.
In addition, DARE returns data on the earliest black hole accretions, the reionization of the universe, ancient galaxy formations and dark matter decay. The craft is operational from 2022.