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.
Eclipses occur due to the special coincidence of the moon and the Sun being the same angular size. The Sun is 400 times wider than the moon, but it is also 400 times farther away, so they coincidentally appear to be the same size in our sky. This is what allows us the phenomenal beauty of the total solar eclipse.
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.