When will the Universe stop Expanding? The Big crunch
This blogpost will also deal with the ending of the universe. Scientists know how the world will end. The Sun will run out of fuel and enter its red-giant phase. Its final burst of glory will expand and engulf the closest planets, leaving Earth a charred, lifeless rock. Our planet has around five billion years left. With this grim image, theoretical astrophysicist Katie Mack begins her book on the end of the Universe — a much more uncertain prospect. Cosmologists generally look backwards, because all the evidence they can examine with telescopes is far away and concerns things that happened long ago. Using the motions of distant stars and galaxies to predict possible futures involves more speculation.n Mack’s hands, this speculation makes for a fascinating story. Humans are, she writes, “a species poised between an awareness of our ultimate insignificance and an ability to reach far beyond our mundane lives, into the void, to solve the most fundamental mysteries of the cosmos”. She is
