Robert Jack
Bio
One of the secrets of emotional stability for adults is to keep the expectations of others to a minimum.
Stories (70/0)
Life may not have originated on Earth
It has long been the consensus of the scientific community that modern life on Earth evolved from the first life on Earth over a long period, but the scientific community has no definite answer to the question of "where did the first life on Earth come from?
By Robert Jack2 years ago in Earth
Extraterrestrial life discovered in the solar system
What would it mean for mankind if one-day extraterrestrial life was discovered on a planet in our solar system? We would normally think that this is exciting news, as the discovery of extraterrestrial life would make humans feel less alone in the universe.
By Robert Jack2 years ago in Earth
Nuclear fusion ends in iron
An atom is composed of a nucleus and electrons, while a nucleus is composed of neutrons and protons. For an atom, the number of protons in its nucleus determines the type of element it is, for example, hydrogen with atomic number 1 has only one proton in its nucleus, helium with atomic number 2 has two protons in its nucleus, and so on for other elements.
By Robert Jack2 years ago in Earth
Why Earth chose carbon-based life
May I ask: Is there more carbon or silicon on Earth? If you answer that there is more silicon, congratulations, you are correct. There may be more silicon on Earth than you think. According to scientists' estimates, the total mass of carbon on Earth is only about one-thousandth of that of silicon.
By Robert Jack2 years ago in Earth
The height of Mount Everest
As the highest mountain on Earth, the great name of Mount Everest can be said to be known to all people on Earth, but in the solar system, the Earth is not the only planet with mountains, so other planets in the solar system, is there a higher mountain than Mount Everest?
By Robert Jack2 years ago in Earth
"Learn to use fire"
In the history of human development, "learning to use fire" is undoubtedly a very important node, through the manipulation of fire, human beings can process various ingredients in nature into cooked food that can be easily digested and absorbed, and can also exert a powerful deterrent to other animals, and can dispel darkness and cold, and harvest light and warmth, from then on Step by step, a glorious civilization has been created.
By Robert Jack2 years ago in Earth
The density of neutron stars
Neutron stars are extremely dense planets in the universe. Even according to the most conservative estimates, the density of neutron stars can be as high as 100 trillion tons per cubic meter, which, it must be said, is unimaginable, so why do neutron stars exist at such high densities? Let's take a look at how empty the atoms are.
By Robert Jack2 years ago in Earth
Why dinosaurs are not all extinct
I believe that we are not unfamiliar with dinosaurs, after all, they were once the dominant generation on Earth, we usually think that dinosaurs are ancient creature that has long been extinct, and in modern times there are no more dinosaurs alive on Earth.
By Robert Jack2 years ago in Earth
If the sun suddenly disappears
What would happen to the Earth if the sun suddenly disappeared? The answer is, of course, the Earth will undergo great changes, but at the moment of the disappearance of the sun, the Earth will not immediately change, because the speed of propagation of the sun's light and gravity is the speed of light, about 300,000 kilometers per second, and the average distance between the Earth and the sun is about 150 million kilometers, so in about 500 seconds, the Earth's great changes will begin, and from then on the prelude to the difficult survival of mankind.
By Robert Jack2 years ago in Earth
The world we live in could be a virtual broadcast
Our human perception of the outside world is the result of our brain's processing of various bioelectric signals, for example, our visual system will convert the external light into bioelectric signals, and then these signals will be transmitted to the brain, after the brain's processing, we "see" the external situation, and similarly, our Hearing, touch, smell, and taste are also produced in this way.
By Robert Jack2 years ago in Earth