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.
August 25, 2003: At 09:51 universal time (UT) on August 27th, Earth makes its closest approach to Mars in nearly 60,000 years. The two worlds, center-to-center, will be just 56 million kilometers apart--a short distance on the scale of the solar system. The last people to come so close to Mars were Neanderthals.