Science
Why no advanced civilizations have visited Earth
The Earth was born about 4.55 billion years ago, and over a long period, life on Earth has gone through a process from nothing to something, from simple to complex, and finally evolved into humans with higher intelligence.
By Robert Jack4 years ago in Earth
Samsara IV before it became dark
Every shining star in the universe will one day go out, and its "lifespan" is closely related to its mass, the more massive the star, the shorter its "lifespan". For example, the "lifetime" of a Proxima star is about 12.2% of the Sun's mass, and its "lifetime" can be trillions of years, while the Sun's "lifetime" is only about 10 billion years, and the "lifetime" of stars that are much larger than the Sun is even shorter.
By Robert Jack4 years ago in Earth
"Interstellar Visitor" Oromo
Since the advent of the era of peaceful development, mankind has been exploring space for decades. Although the knowledge about space is still insignificant in the vastness of the universe, some information about the moon, the sun, and the solar system is available. However, some information about the Moon, the Sun, and the solar system has gradually become clear.
By Karen Gillanah4 years ago in Earth
10 Fascinating Mysteries Involving Spiders
10 Blue Tarantulas There are more than 850 known species of tarantulas worldwide. Some can shoot excrement as a form of defense, while others can grow to be as large as a human face. Then there are those that are bright blue in color for no apparent reason. Experts believe that the hue blue has a significant function. They "do not yet know what that [particular] role is," though. The most likely theory relates to sexual selection. Scientists hypothesize that the tarantulas' bright hue aids in luring prospective mates. However, Bor-Kai Hsiung of the University of Akron argues that this theory is unlikely to be accurate because tarantulas have extremely weak eyesight despite having eight eyes.
By indika sampath4 years ago in Earth
Solar surface near 6000°C
Even though autumn has recently started, the heat has not been kind to us at all. This year, since the beginning of summer, the phenomenon of high temperature will continue to produce, 40 ℃ can not compete for the top ten "hot" cities; heat stroke disease let us know that the original "heat death" is not an exaggerated approach.
By Karen Gillanah4 years ago in Earth
How empty the universe is
I believe that we all know that the universe we live in is very empty, but if you ask, how empty is the universe? It is estimated that many people have no specific concept the universe is so empty that it is likely to be more than you can imagine. To illustrate how empty the universe is, we might as well start with the Earth and the Moon, where we would normally imagine the Earth-Moon system as follows.
By Robert Jack4 years ago in Earth
Mars is 200 million kilometers from Earth
Among the eight planets in our solar system, Mars is the most popular one, except for the Earth, which is inhabited by humans. Even now, there are still people who believe that Mars may be the second home of human beings in the solar system.
By Robert Jack4 years ago in Earth
Suspected to have been smashed by a UFO
There are a huge number of small objects in our solar system. They are very small in mass, usually very fast, and their orbits can easily become unstable due to the influence of other celestial bodies, so there are often small objects that crash into the Earth.
By Karen Gillanah4 years ago in Earth
"One day in heaven, one year on earth"
"A day in heaven and a year on earth", meaning that a day spent in heaven and a year spent on earth, we generally think that such a situation will only appear in those ancient legends, but in reality, this is not the case, because according to the theory of relativity proposed by Einstein, the passage of time is not constant.
By Robert Jack4 years ago in Earth
The solar system is falling towards the black hole at the center of the galaxy
The Sun has accompanied the evolution and development of mankind since the dawn of time. In the limited history of cognition, there are various statements about the Sun and the Earth, among which the geocentric theory dominates again. It was not until Copernicus proposed the heliocentric theory in the early sixteenth century that a new phase of knowledge about the Earth and the Sun was initiated.
By Karen Gillanah4 years ago in Earth
A planet of 1 light year
Does a planet with a diameter of 1 light year exist in the universe? One of the more common thoughts on this question is that it is not impossible to form a planet with a diameter of 1 light year if there is enough matter, however, according to the laws of the universe as we know it, such a thing is simply not possible.
By Robert Jack4 years ago in Earth
