This is one article of a series on using DNA for genealogical research. There are several. types of DNA tests offered for genealogical purposes. Researchers must understand that. only like tests can be compared: Y-DNA to Y-DNA, mitochondrial DNA (mtDNA) to. mtDNA, and autosomal DNA (atDNA) to autosomal DNA. To use DNA to solve a. problem, an understanding of DNA inheritance and the limits of the evidence is paramount. This article covers atDNA.
The speed of light is about 186,000 miles or 300,000 kilometers per second. So, in one year light travels a distance of about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers or 63,240 A.U.. This distance is 1 light-year.For example, the nearest star to us is about 4.3 light-years away.he speed of light is about 186,000 miles or 300,000 kilometers per second. So, in one year light travels a distance of about 5,880,000,000,000 miles or 9,460,000,000,000 kilometers or 63,240 A.U.. This distance is 1 light-year.
It is a function of how long. it takes information to travel at the speed of light in the communications media. from source to destination. In free space, the speed of light is approximately. 3 x 105 km/sec. The speed of light is lower in other media such as copper wire. or fiber optic cable. The amount of slowing caused by this type of transmission.