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The gravitational waves theorist saw physics as no one else did, but if he was around today his time would be spent chasing grants or tenures<p>The discovery of gravitational waves has been hailed as yet another vindication of Albert Einstein’s theory of general relativity, unveiled a century ago. …

Physics

26 years ago, Carl Sagan gave us an incredible perspective on our planet

As NASA's Voyager 1 spacecraft was about to leave our Solar System in 1989, Sagan, who was a member of the mission's imaging team, pleaded with officials to turn the camera around to take one last look back at Earth before the spaceship left our solar system.<p>The resulting image, with the Earth as a …

How to touch someone, according to science

With a stroke of the hand he or she wishes to convey an ancient and deeply human message: You are cared for, you are safe. But what makes for a meaningful loving touch?<p>Is it something baked into the structure and function of our skin, nerves, and brain, or the result or our culturally constructed …

Still don’t understand the groundbreaking discovery? We asked scientists to break it down so that even a five-year-old could understand<p>If you didn’t fully grasp Thursday’s blockbuster announcement that scientists had detected gravitational waves, ripples in the fabric of spacetime that were first …

Physics

Was the Big Bang just a black hole?

Fraser Cain "Asks a Spaceman" Dr. Paul Matt Sutter – why do we call the Big Bang a singularity, when we also call black holes singularities?

How We Entered a New Era of Astronomy

It all began with a chirp.<p>Last week, a new era of astronomy began as Laser Interferometer Gravitational-Wave Observatory executive director David Reitze stood before a packed room at the National Press Club in Washington, DC, uttering the words we've been waiting a century to hear: "We've detected …

Top scientists explain how enormously exciting and important gravitational waves are

One hundred years ago, Albert Einstein published his general theory of relativity, which described how gravity warps and distorts space-time.<p>While this theory triggered a revolution in our understanding of the universe, it made one prediction that even Einstein doubted could be confirmed: the …