Dumbbell Exercises and Lifting Routines
Planetary nebula A planetary nebula is the name for a type of emission nebula consisting of a glowing shell of gas and plasma surrounding a central core of a star that went through its hydrogen-and helium-burning stages, ejecting the outer layers of the dying giant star in one of the last stages of its evolution. The core consists of dense carbon ash, formed as a product of nuclear fusion of hydrogen and then helium, which accumulated in the core, then blew away the outer hydrogen- and helium-rich parts of the outer layers of the star as it died. Planetary nebulae have nothing to do with planets, but were named as such in the 1700s by astronomers who could observe faint blurry areas that were not as sharp as stars, and that resembled planets at the time when only crude telescopes were available. Planetary nebulae last only a few tens of thousands of years, compared to billions of years for the earlier life times of the star. Famous examples of planetary nebulae include the Cat's Eye...
Getting Started With Dumbbells
The use of dumbbells gives you a much more comprehensive strengthening effect because the workout engages your stabilizer muscles, in addition to the muscle you may be pin-pointing. Without all of the belts and artificial stabilizers of a machine, you also engage your core muscles, which are your body's natural stabilizers.