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.
Eclipses occur in groups of two or three within an eclipse season which lasts for 36 days. During this time any Full or New Moons occur as Lunar and Solar Eclipses respectively. An eclipse season occurs while the Sun is within eighteen degrees of one of the Moonâs Nodes, that is the points on the Moonâs orbital path where it crosses the path of the Sun. Eclipse seasons arise every six months. Eclipses are us!