What is chroscopy?

What is the best way to spot a fake diamond? How would you breath inside inside a space shuttle? What does odyssey mean when he says that no man canelos avoid the eye of Helios? What element does a low mass star stop at and why? When did Apollo 13 have problems? When is the next time you will be able to see a comet? Which planet is known as the red planet due to the iron oxide found there? Why was there no trace of magnetism in the rocks of Hellas and Argyre on Mars? How big is Bellatrix? How many times earth distance from sun affects year? Can we see stars in other galaxies from Earth? What does an ash cloud do? How fast does the shadow of the sun move across the Earth's surface? What is the semi major axis of ganymede's orbit around Jupiter? What planet is also called the red planet? What is A ROTAION? What percent of stars are low mass medium mass and high mass? What structures play a major role in visual acuity? Time sun set and sun rise in minnasota? What planets are similar to each other in size density and internal?