The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

Our universe plays by certain rules, which originate from different branches of physics. But sometimes the rules seem ...

Ask the publishers to restore access to 500,000+ books. An icon used to represent a menu that can be toggled by interacting with this icon. A line drawing of the Internet Archive headquarters building ...

Capturing the first image of a supermassive black hole using the Event Horizon Telescope (EHT). This image of the black hole at the center of the nearby galaxy M87 reveals how gravitation affects the ...

In the present article it is introduced in a didactic and simplified manner, avoiding major content losses, one of the most used formalisms of geometric representation of event horizons and ...