The lifetime of galaxies, the longest lived stars

Galaxies are groups of hundreds of billions of stars, and galaxies should have no concept of lifespan. Every star is born, grows, ages, and dies.

The longest-lived star: a red dwarf.

The longest-lived star known to be the red dwarf, which can live tens of billions or even hundreds of billions of years. Because it is the most numerous, the most evolutionarily stable, and the longest-lived in the Milky Way. Scientists currently estimate that there are at least a few billion red dwarfs in the Milky Way galaxy that have terrestrial planets.

Red dwarfs are dwarfs with low surface temperatures and reddish colors, especially the "colder" M- and K-type stars in the main-sequence star, which have a mass of no more than half the mass of the Sun and more than 105 Jupiters with a surface temperature of 2,500 to 5,000 K. Proxima centauri, the closest star to Earth other than the Sun, is a red dwarf.

Red dwarf nature

Red dwarfs, according to the Haro diagram, are relatively small and low in size and temperature among the many stars in the main sequence stage. They are abundant in stars, with most red dwarfs having a diameter and mass of less than one-third of the Sun's and a surface temperature of less than 3,500 K. The light emitted is also much weaker than that of the Sun, sometimes less than 1/10,000th of the luminosity of the Sun.

70% of the stars in our galaxy (and perhaps all galaxies) are red dwarfs, which are fainter than the Sun. Because the light radiated is so faint, it is impossible to see any red dwarf stars without the help of astronomical telescopes. For a long time, few astronomers devoted themselves to the scientific study of red dwarfs due to their size and brightness.

For decades, scientists believed that there could be no intelligent life near red dwarfs.

The above content is a reference to Encyclopedia - Red Dwarf.

Summary. Honey, Mercury is not the shortest-lived. Mercury has the shortest orbit time, and Jupiter seems to have the shortest rotation time.

Honey, Mercury is not the shortest-lived. Mercury has the shortest orbit time, and Jupiter seems to have the shortest rotation time.

Mercury is the warmest surface of the nine planets in the solar system. As soon as the night comes, the heat will be quickly lost, and the surface temperature can drop to about 170 degrees Celsius, and the temperature difference between day and night can reach more than 600 degrees Celsius. Mercury is the closest planet to the Sun and is also the smallest planet.

The Sun rotates two weeks, while Mercury rotates only three weeks, making it difficult for scientists to observe the seasons of Mercury. The water survey star has almost no atmosphere, its surface has extreme climate change, no strong storms, no natural satellites, and the only known geological features are the folded ridges that were probably created during early history and contraction, except for impact craters. Mercury has only an insignificant atmosphere, including gas atoms blasted out by the solar wind, so the sun's rays hit Mercury's bare ground.

Mercury's surface temperature can reach over 500 degrees Celsius after being exposed to the sun during the day.

Summary. Hello dear <>

Mercury is the shortest-lived. Mercury has the shortest number of years of any planet in the solar system, at 88 days. It orbits the Sun faster than any other planet, which is why it was named after the Roman messenger god.

Mercury is not the shortest-lived.

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Mercury is the shortest-lived. Mercury has the shortest number of years of any planet in the Taichang Xingyang system, and the Silver Feast is 88 days. It orbits the Sun faster than any other planet, which is why it was named after the Roman messenger god.

Mercury, because of its rapid motion, was called Mercury in ancient times, which means the messenger god of ancient Roman mythology. In ancient China, it was called Chenxing, and Sima Qian, the author of the Western Han Dynasty's "Historical Records of Tianguanshu", found that Chenxing was gray from actual observation, which was associated with the Five Elements Doctrine, and named it Mercury with black water envy sails. Mercury is the smallest of the eight planets in the solar system and the closest to the Sun.

The orbital period is days, and it meets the Earth once in about 116 days, and its orbital speed is much faster than that of other planets in the solar system. Mercury is the planet with the largest temperature difference between day and night on the surface, and its atmosphere is extremely thin to effectively retain heat, with temperatures reaching up to 432°C at the equator during the day and dropping to -172°C at night. Mercury has the smallest axis tilt of any planet in the solar system (about 30 degrees) but has the largest orbital eccentricity.

The distance of Mercury at aphelion is about times that of perihelion. Mercury's surface is full of craters, similar to the Moon and other moons, and its geology has been inactive for billions of years. Have a great day, dear ones.

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