Extraterrestrial

The Solar System Moves 7 Billion Kilometres a Year, But The North Star Is Always Due North - Why Is That?
In our universe, whether as large as a galaxy or as small as an electron, we are always in motion, and even when we think we are sitting motionless in our chairs, the earth is carrying us around the sun at a speed of about 30 kilometres per second, and the sun is also in motion, in fact it is carrying the entire solar system around the centre of the milky way, and at a speed of about 220 kilometres per second.

How Long Would It Take For Humans To Reach Mars?
Of all the known rocky planets in the solar system, the one with the most similar natural environment to Earth is Mars, and exploration data show that Mars also has an atmosphere, four seasons of the year, and even a rotation period similar to that of Earth.

Why Is The Earth Vibrant And The Moon Dead, When It Is Also Located In The Habitable Zone Of The Solar System?
According to our knowledge of known life, liquid water is essential for life. In other words, if there is liquid water on a planet, there is a possibility of life, and it is for this reason that scientists always consider liquid water as the first requirement when assessing the possibility of life on a planet.

Curiosity Discovers Surreal Phenomenon: Cool Rocks 'Growing' On Desolate Mars, Defying Gravity
In the photos returned from the rover, we see Mars as a desolate world without a trace of life. Although Mars looks desolate and dry, there are many people who believe that Mars may become a second home for us humans

Where Is The Solar System Located In The Galaxy? Is It Unfortunate Or Fortunate For Mankind?
The solar system is located in a region with a stellar density of only 72 million parts per million of the highest stellar density region in the Milky Way, which is a remote and inhospitable part of the galaxy.

How Similar Is Titan To Earth? Scientists: There Are Mountains, Seas And Atmospheres, And Probably Life
Titan is the largest moon of Saturn and the second largest in our solar system, even a little larger than Mercury, one of the eight planets. Due to tidal locking, Titan's rotation period and revolution period are the same, similar to our Moon

Voyager 1 Has Flown 22.8 Billion Kilometres Away, How Did It Manage To Send Its Signal Back To Earth?
The universe is so big, but man's range is so small that the furthest man has been so far is the moon, which is only 380,000 km away from earth on average. Of course, humans have also launched all kinds of probes, and if you include them, the range of human activities is much larger.

The Most Mysterious Crater On The Moon: An Unnaturally Oval Shape With a Giant Structure In The Middle
The "Ryder" crater is actually located on the rim of a much larger crater. Exploration data show that this old crater is about 70 km in diameter, and its rim rises high above the inner area, with an altitude difference of about 3 km