Where have all the stars gone? The answer is surprising...

September 1

my country's Shenzhou 14 astronauts Chen Dong and Liu Yang

Get out of the hatch smoothly

This is the first time that Chinese astronauts have exited the space station through the main channel.

The airlock of the Wentian experimental module enters space

Image source: China Manned Spaceflight

However, careful friends will find

In the footage of astronauts leaving the spacecraft

The starry sky behind the astronaut is actually pitch black

Where have all the stars in the vast sky gone?

The light of stars is "filtered" by the camera

IAF Space Transportation Committee

Vice Chairman Yang Yuguang said

The cause of this phenomenon

It's not that these stars "disappeared mysteriously"

Rather, it is the result of the "selection" of the camera exposure parameters.

That is to say

The photographer used technical means

Make the stars in your photo or video

Invisible in deep space

Image source: China Manned Spaceflight

Yang Yuguang said, in the universe

Stars are the darker subjects

on the contrary

Space station and astronauts under sunlight

It will become very bright

Cameras cannot "see" bright objects at the same time

"See clearly" very dark objects

During extravehicular activities

Take clear photos of astronauts, space station modules, and

Earth's details are a priority

That is, bright objects are used as the standard

Set the corresponding camera exposure parameters

What's different about looking at stars from space?

The images of astronauts leaving the cabin "filter" the stars

So can astronauts in space see the stars?

Are they the same stars we see on Earth?

Researcher at the National Astronomical Observatories of the Chinese Academy of Sciences

Ping Jinsong pointed out

There is no atmospheric scattering in space

Sunlight travels in straight lines

So the space won't be completely illuminated.

In the dark space

Astronauts can see the sky full of stars

Image source: China Manned Space Engineering Office

Photo by astronaut Tang Hongbo

As the astronauts stepped out of the hatch

If you look at the earth

Eyes adapt to bright objects

At this time, I looked up at the dark universe

You may not be able to see the stars clearly for a while.

But the human eye is very adaptable

After your eyes adapt to the darkness

Then you can see the stars

Yang Yuguang said

October 15, 2003

Astronaut Yang Liwei on board the Shenzhou V manned spacecraft

The first space gaze of Chinese astronauts began

According to his recollection

The moon and stars seen from space

More clear and transparent

The stars don't blink

Stars seen by astronauts in space

It's really different from what we see on Earth.

Yang Yuguang said

There are factors such as atmosphere and artificial light on Earth.

Blockage or interference

Makes starlight weaker

It will also "flash"

There are also fewer stars visible to the naked eye

In space

Since there is no atmospheric obstruction or shielding

The stars observed by astronauts have three characteristics

Less flicker, clearer and brighter, more in quantity

Image source: China Manned Space Engineering Office

Photo by astronaut Tang Hongbo

Ping Jinsong also said

Space is a vacuum

No atmospheric turbulence

So the stars don’t blink

There are only stars, no stars twinkling

Therefore

Whether it is around a star, a planet or the moon,

No dizziness or halos

The stars are brighter

Source: Science and Technology Daily

◎ Science and Technology Daily reporter Tang Fang

Editor: Zhang Qiqi

Review: Julie

Final judge: Wang Yu

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