Christophe Galfard holds a Ph.D. in theoretical physics from Cambridge University, where he was Professor Stephen Hawking’s graduate student from 2000 to 2006. He now devotes his time to spreading modern scientific knowledge to the general public in entertaining ways, in France and in Europe, giving talks to more than 50,000 people, and is a regular contributor to French TV and radio shows. Galfard has written four young-adult novels about science, and was co-author with Stephen Hawking and his daughter on their first young-adult novel, George's Secret Key to the Universe. He is also the author of The Universe in Your Hand: A Journey Through Space, Time, and Beyond.
Everything we know about gravity suggests the universe should expand at a decelerating rate, but the opposite is true says Christophe Galfard, Stephen Hawking's protege.
There are only two events in the universe that defy the laws of physics: black holes and the Big Bang, and while scientists try to explain them, crucial evidence may be eaten up in the meantime.