Manned spacecraft generally orbit the earth in low-earth orbit, and the earth is so big that astronauts can't see the whole picture of the earth at a glance (just half the earth). It was not until NASA launched the Apollo moon landing program that mankind witnessed the whole earth for the first time.
For the first time, apollo 8 left low-earth orbit with three astronauts and headed for the moon. On the way to the moon, three astronauts saw the panoramic view of the earth for the first time. They filmed the earth at a distance of 30,000 kilometers;
However, apollo 8 was only a "rehearsal". Instead of landing on the moon, he flew around it. In the process of flying around the moon, astronauts photographed the "earth" for the first time:
From Apollo 1 1 to Apollo 17, we successfully landed on the moon six times. Although the Apollo spacecraft can carry three astronauts at a time, one astronaut must stay in the command module/return module flying around the moon, so only two astronauts will land on the moon at a time. In other words, 12 astronauts set foot on the land of the moon, and they all saw the earth with their own eyes on the moon.
The radius of the earth is about 3.7 times that of the moon, so the earth seen from the moon will appear very large, and the apparent area of "full ground" is equivalent to 14 times of the full moon. You will see strange phenomena on the moon. The earth will not rise or fall in the air.
The reason is that the moon is tidal locking relative to the earth, and the front of the moon always faces the earth. No matter how the moon turns, the earth is always hanging in the sky and will not move. On the back of the moon with its back to the earth, you can't see the earth.
Because NASA didn't launch a relay satellite similar to China's "Magpie Bridge" when Apollo landed on the moon, it would lose contact whenever the Apollo spacecraft flew to the back of the moon. In order to keep communication with the earth, the Apollo spacecraft landed on the front of the moon, so the astronauts on the moon could see the earth.
Apollo astronauts stayed on the moon for several hours to several days. During this time, the earth always hung in the same position in the sky. However, as the moon revolves around the earth, the phase of the earth will also change, just as we see the phase change of the moon on the earth.
Due to the change of phase, it is often impossible to see the panorama of the earth. In a recent mission to the moon, when the Apollo 17 spacecraft rushed to the moon, the astronauts photographed a rare "ground" at a distance of 45,000 kilometers from the Earth:
This is the famous "blue marbles", and we live on this planet.
In the dark space, there is such a blue planet that looks out of place. The earth is a very unique existence, and we have searched all over the solar system and can't find a second such planet. The earth is the only known living planet.
The environment in the universe is extremely sinister, deadly electromagnetic radiation, blazing high temperature and ubiquitous darkness, and the earth is in it, which may make people feel terrible. It is hard to imagine how fragile life would be without the protection of the earth.