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.
Best Answer: Its amazing what you can learn if you read about this. Total lunar eclipses only occur when the moon is on the side of the Earth directly opposite the sun (it appears as a full moon). Full moon occurs every 29.5 days (about once a month). But the moon doesn't orbit the Earth in the same plane as the sun appears, so there are many times when the moon is either above or below that direct line with the sun - the moon misses Earth's shadow. Total solar eclipses ANYWHERE are more rare than lunar eclipses: - the moon has to be directly in line with the sun.