What is the relationship between livable planet, the second earth, Titan and "star"?

NASA is preparing to return to Saturn's moon Titan. This time, a drone-like rover dragonfly will go to Titan. In this process, scientists will not only understand the geography, atmosphere and weather of Titan, but also look for signs of life and try to better understand how life appeared on our planet.

Biologists are particularly happy to hear this decision, because the results of NASA's Cassini mission show that Titan is a planet very similar to the early Earth. From 2004 to 20 17, the so-called Cassini mission flew to Titan 126 times in the process of exploring Saturn system. ?

Titan gives people the first impression that not all conditions are suitable for human habitation. Its surface temperature reaches-179 degrees Fahrenheit-so cold that water condenses into ice, as hard as granite, and the rain that fills lakes and oceans is liquid methane. ? But it has a thick atmosphere, in which sunlight reacts chemically to produce complex organic molecules, and then they spread to the surface of Titan, "like a never-ending light snow".

In order to further extend its life, it has eight rotors arranged in pairs instead of four. So, one is broken and the other can still be used. In fact, Mackenzie said that dragonflies can withstand the damage of four rotors, as long as no two rotors are the same pair. ? Turtle added that it is easier to fly on Titan than on Earth, because although Titan's atmospheric density is four times higher than that of the Earth, its gravity is one seventh of that of the Earth. "If you had wings, you would fly on Titan," she said. "This is the best way to travel."