If humans build light-speed spacecraft, can they cross the Milky Way? Scientists say it is impossible If humans build light-speed spacecraft, can they cross the Milky Way? Scientists say it is impossible
What is the essence of time? Einstein used his own theory to tell the truth What is the essence of time? Einstein used his own theory to tell the truth
When a herbivore meets a carnivore, why don’t they resist and choose to escape? When a herbivore meets a carnivore, why don’t they resist and choose to escape?
If life is found on Mars, it may be bad news for humans If life is found on Mars, it may be bad news for humans
The torrential rain that lasted for 2 million years has completely changed the ecology of the earth, and it may reappear in the future. The torrential rain that lasted for 2 million years has completely changed the ecology of the earth, and it may reappear in the future.
If human beings are the only intelligent civilization in the universe, should we continue to explore the universe or maintain the status quo? If human beings are the only intelligent civilization in the universe, should we continue to explore the universe or maintain the status quo?
The sun’s lifespan has 5 billion years left. Will human beings survive on the earth till that time? The sun’s lifespan has 5 billion years left. Will human beings survive on the earth till that time?
Hawking once warned: human beings should leave the earth as soon as possible. Why is this? Hawking once warned: human beings should leave the earth as soon as possible. Why is this?
1.2 million kilometers away, Tianwen No.1 took a group photo of Earth and Moon. We were silent when we saw it. 1.2 million kilometers away, Tianwen No.1 took a group photo of Earth and Moon. We were silent when we saw it.
If a disaster leaves the earth with only 1 man and 1 woman, how long will it take to return to 7.8 billion humans again? If a disaster leaves the earth with only 1 man and 1 woman, how long will it take to return to 7.8 billion humans again?