The Little Red Dots in distant galaxies are supermassive black holes in their early stages of growth, hidden in dense envelopes of neutral gas and electrons[1][2][3][4]. Observed by the James Webb Space Telescope, they show luminous Balmer emission lines with broad wings wider than 1000 km/s, a hallmark of active galactic nuclei[1]. Their light is scattered by electrons in dense gas cocoons, which block X-ray and radio radiation and turn it into a characteristic red color[2][3][4]. These black holes are about 100 times less massive than previous estimates, with masses between 100,000 and 10 million solar masses and diameters of about 10 million km[3][4]. Dense gas cocoons enable rapid growth from initial seeds by accretion from all sides[1][4]. Analysis of data from 12 individually studied galaxies and another 18 confirms that these are young black holes in a previously unobserved phase of development[2]. These objects shed light on how early supermassive black holes formed just 700 million years after the Big Bang[4].