White Dwarf Life Cycle why do most of the massive stars end up as black hole Life Dwarf White Cycle

White Dwarf Life Cycle why do most of the massive stars end up as black hole Life Dwarf White Cycle

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It is important to know at any age!

Almost every moon in our Sun's family of orbiting objects, including Earth's own bewitching, large Moon, rotates on its axis at the same speed as it orbits its parent-planet. It is for this reason that we always observe the same side of our Moon facing us on Earth. But on Pluto, things work a bit differently. Astronomers have now discovered that there are no hidden sides to its moons!

and here is another

The chaotic motions of the bewitching, bewildering dance of the distant moons, is not necessarily an indication that the Pluto system is trembling on the brink of falling apart. Additional observations are necessary in order to determine the future and ultimate fate of the Pluto system.

and finally

Kepler-22b, with its radius almost two and a half times that of Earth, is too large to be considered a true Earth-analog. Nevertheless, if it possesses an Earth-sized moon, the planetary system could still host a habitable world like our own.

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The most detailed pictures of Europa show even more intriguing clues that there is slush lurking beneath its brightly shining icy surface. Slightly smaller than Earth's own beloved Moon, Europa's surface temperature could easily freeze an ocean solid over a span of only several million years. However, some astronomers think that warmth from a game of tidal tug-of-war between Europa and Jupiter, as well as other neighboring moons, could be keeping large regions of Europa's subsurface global ocean in a life-friendly liquid state. This process is termed tidal heating, and it refers to a mechanism whereby the gravitational tugs of a nearby object (or objects) flex and bend and contract and expand another object continually. This constant churning causes the victimized object, in this case Europa, to heat up and be considerably more balmy than its great distance from the Sun would otherwise allow it to be.

A fourth, more recent model, is based on the existence of a synestia. A synestia is a doughnut-shaped cloud composed of vaporized molten rock. This recently discovered inhabitant of the Universe is believed to take shape when planet-sized bodies catastrophically blast into one another with both high energy and angular momentum. Soon after the discovery of these puffy celestial "doughnuts" in 2017, planetary scientists came to the realization that they may have a new way to explain Moon-birth. The ancient collisions, that create a synestia, are so violent that the objects that form from these cosmic crash-ups melt and partially vaporize. Ultimately, after having cooled off sufficiently to solidify, they create (almost) spherical planets, such as those inhabiting our own Solar System.

According to this theory, the Saturn system began with a family of several relatively large moons, analogous to the four large Galilean moons of Jupiter--Io, Europa, Ganymede, and Callisto. However, strange and violent things happened in the Saturn system that drove its large moons onto a collision course with destiny. According to the theory, there were a few dramatic moon mergers, forming the Titan that we now know--but there was also a sufficiently large quantity of moon-stuff left over from the collisions to create the icy mid-sized satellites--Mimas, Iapetus, Enceladus, Tethys, Dione, and Rhea!

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