Volcanic rocks are usually fine-grained or aphanitic to glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye.Rhomb porphyry is an example with large rhomb shaped phenocrysts embedded in a very fine grained matrix.Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava.henocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye. Rhomb porphyry is an example with large rhomb shaped phenocrysts embedded in a very fine grained matrix. Volcanic rocks often have a vesicular texture caused by voids left by volatiles trapped in the molten lava.
The actual temperature in space is about 3Â°K (-270Â°C or three degrees Celsius above Absolute Zero). There are still molecules in space, just very few of them, and this is their temperature. Absolute zero is a theoretical temperature where the thermal kinetic energy of the molecules in a body goes to zero.
NASA researchers are planning to create the coldest spot in the known universe inside the International Space Station. âWeâre going to study matter at temperatures far colder than are found naturally,â says Rob Thompson of JPL. Heâs the Project Scientist for NASAâs Cold Atom Lab, an atomic ârefrigeratorâ slated for launch to the ISS in 2016. We aim to push effective temperatures down to 100 pico-Kelvin.. A new ScienceCast video explores the strange quantum realm of NASA's new Cold Atom Lab.