How to survive in the galaxy
The Milky Way is a dangerous place, full of stars and gamma-ray bursts, which may strip one away The planet’s atmosphere threatens life on the planet. An analysis showed that the safest areas around the galaxy have moved from the periphery to the center of the galaxy over time.
Researchers calculated the frequency of supernova and gamma-ray bursts throughout the Milky Way, and whether these bursts are likely to occur Near the rocky planet. From the formation of the Milky Way 13 billion years ago to 6 billion years ago, the most suitable place for life to survive is the outer periphery of the Milky Way.
But about 4 billion years ago, the dense planetary area with a distance of about 2000~8000 parsecs from the center of the Milky Way the center of the Milky Way was The lowest risk area. The earth is on the outer edge of this area. In a report recently published in the journal Astronomy and Astrophysics, scientists said that one or two deadly radiation outbreaks may have occurred in the past It reached the earth in 500 million years, which supports the view that the gamma-ray burst caused the mass extinction at the end of the Ordovician about 445 million years ago. (Jin Nan)