India, April 25 -- Pioneering Yale astrophysicist Priyamvada Natarajan proved that black holes can be formed by unstable gas. Now she's looking at the invisible universe using new technologies. In popular imagination and in science fiction, black holes are places of intense gravity, kind of like cosmic vacuum cleaners that suck in everything around us. They are formed when stars explode, become supernovae and leave behind deep punctures in the fabric of the universe. They're hard to understand, even for Priyamvada Natarajan, professor of astronomy and physics at Yale University, who has studied the phenomenon for decades. In 2006, Natarajan proposed a radically different idea on how black holes in the early universe are formed. Not by a sta...