Theory of relativity
The Closest Black Hole to Earth Has Been Discovered by Scientists
The black hole forms part of a triple star system known as HR 6819, which can be seen without binoculars or telescopes from the southern hemisphere on a dark, clear night.
NASA Visualization Reveals How a Black Hole Warps Its Surroundings
"Simulations and movies like these really help us visualize what Einstein meant when he said that gravity warps the fabric of space and time," the creator of the images said.
Happy Birthday Albert Einstein: Quotes From Physicist
Einstein was born in Germany in 1879.
Atomic Clocks Can Measure the Height of a Mountain
Scientists hit the road with a high-precision clock hooked up to a trailer.
Test of Einstein's Theory Shows Our Sun Is Losing Mass
The planet Mercury was the key for this latest feat.
Weighing a Star: Einstein's Impossible Hope Achieved
Einstein predicted that gravity and light could be used to calculate the mass of a star. But he never thought scientists could actually do it.
Time Travel: A Scientist Vs. a Literature Professor
Since HG Wells imagined humans traveling in time with technology, literature has inspired science. Will time travel be possible one day?
Albert Einstein: A Driven, Curious and Innovative Mind That Changed the Course of History
By 1921, Einstein was recognized as one of the most talented minds of his generation.