If Black Hole does not emit light then how we have picture of black hole?

This is one of the most interesting questions in space science.

As we know, a Black Hole itself does not emit light because its gravity is so strong that even light cannot escape from it. That is why Black Holes are technically invisible.

So then how did scientists capture a picture of a Black Hole?

The answer is simple.

Scientists did not directly photograph the Black Hole itself. They photographed the glowing material around it.

What Are We Actually Seeing in the Black Hole Image?

The famous Black Hole image released in 2019 shows:

• A dark shadow in the center
• Bright glowing gas around it

The dark center is the Black Hole’s shadow, while the orange glowing ring is superheated gas and dust rotating around the Black Hole at extremely high speed.

This hot material becomes millions of degrees hot and emits radio waves and light before falling inside the Black Hole.

So the image is actually the effect of the Black Hole, not the Black Hole directly.

How Was the Picture Captured?

Scientists used the Event Horizon Telescope, which is not a single telescope.

It is a network of giant radio telescopes placed across Earth. All these telescopes worked together like one Earth-sized telescope.

Because Black Holes are extremely far away, normal cameras cannot capture them. Scientists collected huge amounts of radio signal data and then used supercomputers to create the final image.

Which Black Hole Was Photographed?

The first Black Hole image was captured from a galaxy called Messier 87 (M87), located about 55 million light-years away from Earth.

The Black Hole itself is called:

M87 Black Hole

It is billions of times heavier than our Sun.

Why Is the Center Dark?

The center looks black because light cannot escape from inside the event horizon, which is the boundary around a Black Hole.

Anything crossing this boundary disappears from the visible Universe.

That is why the middle appears completely dark.

Simple Example

Imagine a fan spinning very fast in dust.

You may not clearly see the fan blades, but you can see the dust moving around it and understand something invisible is there.

Scientists study Black Holes in a similar way by observing the glowing matter around them.