Are cell mutations always bad? A mutation is a change in the genetic material of an organism. We are made from trillions of cells, each with a nucleus composed of DNA â a set of instructions that tells the cell what to do. Cells copy themselves with astonishing accuracy, but every now and then a piece of code is copied incorrectly.
Seven eclipses occur in a minimum of 12 lunar months (about 354.37 days). Given that the calendar year is only about eleven days longer than 12 lunar months, the first of the seven eclipses has to come in early January for the seventh eclipse to occur before the end of the year.
On August 21, 2017 there will be a total solar eclipse on a narrow path across the United States. A total solar eclipse occurs when the new Moon passes between the Sun and the Earth. The event creates fascinating lighting and allows viewers to see the corona of the Sun. Gallatin, Tennessee will be one of the best spots in the country to view the total eclipse with totality lasting two minutes and forty seconds.