What is space-time? Depending on how fast you're moving or how close you are do Earth's gravity can change the way time feels ...

He saw his theory of relativity as a natural extension of the classical physics developed by pioneers such as Italian astronomer Galileo Galilei and English physicist Isaac Newton, who both ...

"God does not play dice." This famous remark by Albert Einstein critiqued the probabilistic nature of quantum mechanics.

THE appearance of a connected account of the Principle of Relativity in our own language will be welcomed by many as an opportunity of acquainting themselves in more detail with the ins and outs ...

Albert Einstein proposed in his 1905 special theory of relativity that nothing can exceed the speed of light in a vacuum — about 186,000 miles a second.

Do objects have temporal parts? Is time travel possible? What does special relativity have to say about the previous questions? We will do some elementary relativity theory, but no physics background ...

Relativity is also getting closer to its first Terran 1 launch attempt. This much smaller rocket has a capacity of 1.25 metric tons to low Earth orbit. Ellis said the company already has printed ...

Relativity Space said Wednesday that it had received its launch license from U.S. regulators, clearing the way for its first-ever orbital flight attempt on March 8.

But Relativity Space is treating 3-D printers as a one-stop shop for nearly all of its rockets. Some 85 percent of the mass of Terran 1 was made using 3-D printers, and each rocket can be crafted ...