White Dwarf Life Cycle life cycle of an average star white dwarf Life White Dwarf Cycle

White Dwarf Life Cycle life cycle of an average star white dwarf Life White Dwarf Cycle

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Triton also possesses a thin atmosphere composed mainly of nitrogen, and a smaller quantity of methane. This atmosphere probably is the result of Triton's cryovolcanism, which is enhanced by seasonal heating from the Sun. Although little is currently known of Pluto's atmosphere, it is thought to be primarily composed of nitrogen with some carbon monoxide and methane added to the mix--and it is extremely tenuous. Pluto's very thin atmosphere may exist as a gas only when Pluto is nearest to the Sun (perihelion). For most of Pluto's very long year, the atmospheric gases are frozen in the form of ice on its extremely frigid surface. One year on Triton is almost 248 Earth-years long--or 90,471 Earth-days!

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The research proposes that the shoreline surrounding Ligeia Mare is possibly porous and may be saturated with liquid hydrocarbons. The data span a period running from local winter to spring, and the astronomers expected that--in a way similar to seasides on Earth--the surrounding solid terrains on Titan would warm much more rapidly than the sea.

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Images of Europa taken by Galileo in 1997 provide some important evidence suggesting that Europa may be slushy just beneath its glistening cracked icy crust--and possibly even warmer at greater depths. This evidence includes an oddly shallow impact crater, chunky-looking textured blocks of surface material that tantalizingly resemble icebergs on Earth, and openings in the surface where new icy crust appears to have formed between continent-sized plates of ice.

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However, the crater's shallow basin and tall surrounding mountain peaks may be whispering the precious secret that the subsurface ice was warm enough to collapse and fill the deep hole created by the impact.

Earth's Moon is the fifth largest moon in our Solar System, and the only world beyond our own that we have walked upon, leaving our footprints behind in moon dust as a silent testimony that once we existed, and had been there. Our Moon is both the brightest and largest object in Earth's night sky, and many astronomers think that our bewitching lunar companion was born as a result of an ancient collision between our planet and an ill-fated Mars-sized protoplanet that has been named Theia. There are other theories that have been devised to explain our Moon's origin, but the Giant Impact theory is considered to be the best explanation. When the doomed Theia blasted into the primordial Earth, it launched into the sky above our planet the debris resulting from that catastrophic crash. The debris eventually coalesced into Earth's Moon.

The most popular theory of lunar formation suggests that the Moon was born in a monumental collision between a Mars-size object named Theia and the ancient Earth--and that this ancient smash-up would have melted our primordial planet. This model further suggests that more than 40 percent of Earth's Moon is composed of the debris of the tragedy that was Theia. However, more recent theories indicate that our planet suffered from several giant collisions during its formation, with the lunar-forming crash being the last great grand finale event.