Einstein desperately wanted a unified theory of physics. Thanks to gravitational waves—the poster child of general relativity—his wish might just come true. Gravitational waves are ripples in the ...

Cosmic strings are hypothesised one-dimensional topological defects formed during symmetry-breaking phase transitions in the early Universe. As these strings evolve, they intersect and form loops ...

Sound waves, also known as mechanical waves, are vibrations created by objects that make noise. When something vibrates, such as a guitar string or the air when you speak, sound waves are produced and ...