Psychology Glossary. Genotype. The total set of genes contained within an organisms cells. Organisms contain some genes that are expressed (you can consider the expressed to mean that the gene is active or being used) and some that are not. Regardless, all the genes an organism has are considered the genotype.
Mars' closest approach to the Earth is called opposition, and occurs roughly every 780 days.
The average distance is approximately 225 million km ( or 1.50403 AU). The Earth has a shorter orbital period than Mars, it passes in between Mars and the Sun approximately every 780 days, or 2 years and 50 days. At that time , Mars is seen in the opposite direction from the Sun, at opposition. The time interval between Marsâ opposition and its least distance to Earth can be as large as 8 and a half days. In 2001, for example, opposition took place on June 13 but least distance was on June 21. Each opposition is followed by a very similar one 79 years later.