Space

Question 1

What are black holes?

Answer 1

A black hole is formed when stars collapse and can be defined as a space in the universe with an escape velocity so strong that even light cannot escape it.
Escape velocity is the speed at which an object must travel to override a planet or an object’s gravitational force.

Question 2

2020 Nobel Prize in physics

Answer 2

Penrose: Discovered “that black hole formation is a robust prediction of the general theory of relativity.”

Genzel and Ghez: Discovered a “supermassive compact object at the centre of our galaxy.” - Sagittarius A* supermassive black hole, which has a mass 4mn times that of the Sun and is confined to an area roughly the size of our Solar System.

Sagittarius A* is one of two black holes whose photographs have been captured by the Event Horizon Telescope project.

Black holes do not emit or radiate anything, even light. no way their image can be captured. But the area just outside its boundary, called the event horizon, which has vast amounts of gas, clouds and plasma swirling violently, does emit all kinds of radiations, even visible light.