And it all starts in the nucleus! (Warning: any discussion of the nucleus excludes prokaryotes. The nucleus is a eukaryotic song and dance number, and don't you forget it.) Most eukaryotic cells have a nucleus throughout their entire life cycles, but there are a few notable exceptions.
The northern lights are strongest when an active area on the sunâs surface faces Earth. Spectacular displays of the northern lights thus occur at roughly 27-day intervals, the time it takes the sun to rotate once. October, February and March are the best months for seeing the aurora borealis.
Visit the vast countryside and enjoy the natural beauty of the north. Midsummer is a peak time for the Nordic nations to get sunlight, they have days that eclipse nights. It is also one of the warmest times a year and allows access to many remote places that aren't accessible during the long snowy winter months.