If you have enough protective equipment to keep you approaching a black hole in space, and at this time, you have a telescope that is powerful enough to look back at the earth, what will you see?
Einstein's theory of relativity tells us: At this time, you can see that everything on the earth is getting up, and a cycle of spring, summer, autumn and winter only takes a few seconds. In a while, you will observe the historical changes on the earth for the next few thousand years. And the closer you are to the surface of a black hole, the faster the time you observe the earth's time passes. You may see the destruction of the earth's ecology, the disappearance of all species, the crash of the moon, the earth is swallowed by the sun that has become a red giant, and later the sun becomes a white dwarf and eventually cools down. (People on Earth look at you, the opposite is true: you get closer to the black hole and slower, and eventually stop on the surface of the black hole forever)
However, this is a thought experiment, and it is estimated that it is difficult for human technology to meet the requirements of black hole travel. However, the technology of time-lapse photography can achieve the effect of "making time faster".
Time-lapse photography is actually very simple. It is to take a photo on a fixed time period on an image, and then play back the obtained photo in a short time. This way, you can see what is happening in minutes, hours, days, or even years in seconds. In other words, this is an operation opposite to "slow motion", which is a " fast lens " to observe things.
Let’s see a few examples:
The blooming of geranium flowers: two hours shortened to a few seconds
Sunset
African grassland night scene
Norwegian night aurora
Movie director Anthony Cerniello based on photos of himself and his relatives. The time-lapse photo of a woman’s life is very simple. With a smartphone, it becomes easier. There are many applications that allow ordinary people to master this technology.
