White Dwarf Life Cycle what a white dwarf is Life White Dwarf Cycle

White Dwarf Life Cycle what a white dwarf is Life White Dwarf Cycle

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The mass distribution of the moons of Neptune is lopsided. In fact, it is the most lopsided satellite system of any of the giant planets dwelling in our Solar System. Triton accounts for nearly all the mass of the system, with all of the other moons together accounting for only one-third of 1%. This is very similar to the system of moons that circle the ringed-planet Saturn, where the large, smoggy, orange moon Titan--the second-largest moon in our Sun's family (after Ganymede of Jupiter)--accounts for over 95% of the total mass of Saturn's system of moons.

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The name moon jellyfish is purely descriptive. They are named for the most prominent part of their anatomical makeup, their large disk or full moon shaped bell. They can be further distinguished by the four horseshoe-shaped gonads at the center of their bell. These reproductive organs resemble the craters found on the moon. These fish are very popular as pets because they are transparent and will appear to glow in whatever color is shined through them. They look particularly stunning in an aquarium with an LED fader system set up in it. Another point in their favor is that their stinging cells do not produce enough pressure to pierce human skin. In the wild, a moon jelly's life cycle is limited to one year form start to finish. In captivity they can easily live up to three years. These jellies can grow up to one foot in diameter.

and finally

Judith E. Braffman-Miller is a writer and astronomer whose articles have been published since 1981 in various newspapers, journals, and magazines. Although she has written on a variety of topics, she particularly loves writing about astronomy because it gives her the opportunity to communicate to others the many wonders of her field. Her first book, "Wisps, Ashes, and Smoke," will be published soon.

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Of the hundreds of bewitching moons in our Sun's family, Titan is remarkable for being the only one boasting a dense atmosphere and large liquid reservoirs on its surface, rendering it in many ways more like the four rocky, terrestrial planets of the warm and well-lit inner Solar System. Indeed, both Earth and Titan possess atmospheres dominated by nitrogen--more than 95 percent nitrogen in Titan's case. However, unlike our Earth, Titan's atmosphere has very little oxygen; the remainder of its atmosphere is primarily composed of methane and trace quantities of other gases--such as ethane. At the truly frigid temperatures found at the Saturn system's great distance from our Sun, Titan's methane and ethane can exist on the surface in their liquid form.

Methane and nitrogen present in Titan's atmosphere react together to create a variety of organic materials. Many planetary scientists think the heaviest materials somersault down to the surface of hydrocarbon-slashed Titan. Dr. Le Gall and her team propose that when those compounds splash into the sea, either by directly falling from the air as hydrocarbon rain, or through Titan's rivers, some are dissolved in the liquid methane. The compounds that do not dissolve, such as nitrites and benzene, sink down into the floor of this exotic sea.

The prevailing theory of lunar formation--the Giant Impact hypothesis--proposes that our Moon was born as the result of a disastrous collision between our still-forming proto-Earth and a doomed Mars-sized body named Theia--and this impact is thought to have created a partially vaporized, extremely hot disk of material that swirled around our infant planet. Eventually, this primordial disk cooled off, and ultimately accreted to form our Moon. In February 2018, a team of astronomers announced that their ongoing research is revealing that Earth's Moon may be wetter than initially thought, which raises important questions about some aspects of this origin story.