sentence: White holes are the exact opposites of black holes.
sentences_after: A black holes sucks in energy and a white hole expels energy. They are polar opposites. Some scientists even believe you can make a wormhole if you connect a white hole and a black hole. Or, if you connected a white hole from the past, and connected it to a black hole today, you could theoretically create a time machine. The possibilities are endless.
concept_name: white hole
headings: White hole
categories: Astrophysics Astronomical objects