PCS 581 Lecture Notes - Lecture 18: Cosmic Calendar, Astronomy And Astrophysics, Hydrogen Sulfide
Document Summary
Life requires heavy elements like hydrogen, oxygen, nitrogen, carbon. Stars that produce the biggest elements die the fastest. The frost line is the dividing line between where hydrogen compounds can and can"t condense out to form ice. Near the sun, below the line of ice were heavier elements such as silicates and metals. The high temperature does not allow condensation (from gaseous to solid state) of light molecules such as water, ammonia, hydrogen, carbon dioxide or methane sulfide. So at this point of the disc are formed small terrestrial objects of low mass (mercury, Scarce, the solid matter available has generated only small objects. Beyond the line of ice, the temperature drops below 260 k and the water molecules, ammonia, hydrogen sulfide, carbon dioxide and methane are condensed. Jupiter is surrounded by more than 60 moons. The first of jupiter"s moons were discovered in 1610.
