Julie McEnery is a NASA Project Scientist and Astrophysicist, and describes what she says is a major breakthrough in astrophysics and the most extraordinary scientific event of her career: this year, scientists heard the universe for the first time. The witnessed two neutron stars circle and circle, and smash into each other with such force that it sent ripples through space time – which then blasted through the universe until we detected them here on Earth.
Marcus Chown discusses his new book, “The Ascent of Gravity,” in which he argues understanding what gravity is, could show us what the Universe is made of.