科普性文章A Scientists at the U.S. space agency Nasa have confidently predicted that this year the Aurora Borealis, or Northern Lights, will be the brightest and most intense for 50 years. But what exactly is the Aurora Borealis? In truth, there is still a lot of mystery surrounding this wonder of nature. However, it is understood that the phenomenon is caused by solar wind - electrically charged particles that the sun flings across the solar system con
