We all have some past events that we'd like to undo. These can be minor moments, such as a failed exam or an argument with friends, or world-changing incidents, such as the 2019 outbreak that led to ...

Want to visit an interesting exoplanet, or dip dangerously close to a black hole? It is not impossible – there’s no law of physics that forbids humans from traveling through space – but it’s just ...

What would actually happen if a spacecraft traveled close to the speed of light? Einstein’s theory of relativity predicts bizarre and fascinating effects that would reshape how astronauts experience ...