What is a Red Dwarf?

Red dwarf refers to a dwarf with a low surface temperature and a reddish color, especially the "cold" type M and K stars in the main sequence star. The mass of these stars does not exceed half of the mass of the sun and the mass of 105 Jupiters Above, the surface temperature is 2,500 to 5,000K. Proxima Centauri, the closest star to Earth apart from the sun, is a red dwarf.

So-called

Red dwarfs are a class of small stars with a small volume and no more than one third of the mass of the sun. Scientists hope to find so-called "transit planets" nearby. The so-called "transit planets" refer to a class of planets that periodically block the light of some stars when viewed from the earth. Normally, eclipse-like phenomena caused by "transition planets" block about half of the light emitted by stars. And as a result

1. Orbiting a red dwarf called Gliese 581. The distance between them is 0.07 astronomical units, which is exactly enough to ensure 581

Scientists will observe about 2,000 red dwarfs located in the northern celestial sphere. By analyzing the changes in the brightness of these celestial bodies,

Stellar brother:

About 75% of the stars in the Milky Way are red dwarfs. The so-called red dwarfs are the stars with the smallest mass.

One can infer the approximate age of a star cluster based on the long life of a red dwarf. Because the same

When we raised our eyes and looked up at the night sky, we actually regretfully missed the largest number of stars in the Milky Way, namely red dwarfs . 70% of the stars in our Milky Way (maybe all galaxies) are red dwarfs, or M-type dwarfs, which are smaller, cooler and darker than the radiant sun next to us. Their light is too faint. Without help

At present, not all observations are satisfactory to astronomers. For example, although SO25300.5 + 165258 is very similar to the red dwarf of 6.5, it is still a new star. For some reason, it is brighter than 7.8 Light-year 6.5-type red dwarfs typically represent three times weaker brightness, so astronomers do not rule out the possibility that after checking the measurement results, it is found that the distance of this new star will become somewhat larger.

right now,

The preferred target for human future space navigation

"Because of the temperature and relative similarity of 581c, this planet may become an important target for future space programs looking for cosmic creatures," said research scientist Xavier DeForhey. However, to unravel the mystery of 581c, it will take long-term efforts of scientists worldwide. Long distances are a problem. Despite the 581c planet

Study says habitable planets of red dwarfs may face "hypoxia"

According to the Science News website, at the moment, NASA Goddard Space Flight Center scientist Vladimir Airapetian said that a newly developed computer model can assess the exoplanet distance around red dwarfs The escape rate of oxygen is important for detecting the habitability of exoplanets. The latest research report was published in the recently published Journal of Astrophysics.

Dr. Ierapetian said that if we want to discover an exoplanet that can form and sustain life, we must calculate and analyze their parent stars, and we must further understand the parent stars we need. To detect the habitable zone of a star, astronomers usually analyze the heat and light emitted by the star.

Stars that are more massive than the sun produce more heat and light, so the livable zone of stars will be farther away, and the livable zone of cold stars that are less than the sun's mass will be smaller. The release of heat and visible light by stars, the release of X-rays and ultraviolet radiation, and the creation of flares and coronal mass ejections are all collectively referred to as space weather ^[2] .