Asteroid vs Meteor Size what39s the difference between a meteor meteoroid and a Asteroid vs Meteor Size

Asteroid vs Meteor Size what39s the difference between a meteor meteoroid and a Asteroid vs Meteor Size

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Interesting facts about space.

The discovery of Makemake's little moon increases the parallels between Pluto and Makemake. This is because both of the small icy worlds are already known to be well-coated in a frozen shell of methane. Furthermore, additional observations of the little moon will readily reveal the density of Makemake--an important result that will indicate if the bulk compositions of Pluto and Makemake are similar. "This new discovery opens a new chapter in comparative planetology in the outer Solar System," Dr. Marc Buie commented in the April 26, 2016 Hubble Press Release. Dr. Buie, the team leader, is also of the Southwest Research Institute.

and here is another

Makemake, like Pluto, shows a red hue in the visible part of the electromagnetic spectrum. The near-infrared spectrum is marked by the existence of the broad methane absorption bands--and methane has also been observed on Pluto. Spectral analysis of Makemake's surface shows that its methane must be present in the form of large grains that are at least one centimeter in size. In addition to methane, there appears to be large quantities of ethane and tholins as well as smaller quantities of ethylene, acetylene, and high-mass alkanes (like propane)--most likely formed as a result of the photolysis of methane by solar radiation. The tholins are thought to be the source of the red color of the visible spectrum. Even though there is some evidence for the existence of nitrogen ice on Makemake's frozen surface, at least combined with other ices, it is probably not close to the same abundance of nitrogen seen on Pluto and on Triton. Triton is a large moon of the planet Neptune that sports a retrograde orbit indicating that it is a captured object. Many astronomers think that Triton is a wandering refugee from the Kuiper Belt that was captured by the gravity of its large, gaseous planet. It is possible that eventually the doomed Triton will plunge into the immense, deep blue world that it has circled for so long as an adopted member of its family. Nitrogen accounts for more than 98 percent of the crust of both Pluto and Triton. The relative lack of nitrogen ice on Makemake hints that its supply of nitrogen has somehow been depleted over the age of our Solar System.

and finally

Europa: Planetary scientists generally think that a layer of liquid water swirls around beneath Europa's surface, and that heat from tidal flexing causes the subsurface ocean to remain liquid. It is estimated that the outer crust of solid ice is about 6 to 19 miles thick, including a ductile "warm ice" layer that hints that the liquid ocean underneath may be 60 miles deep. This means that Europa's oceans would amount to slightly more than two times the volume of Earth's oceans.

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NASA's future exploration of ocean worlds is enhanced by HST's monitoring of Europa's possible plume activity and Cassini's long-term observations of the plume of Enceladus. In particular, the investigations of both ocean worlds are providing the groundwork for NASA's Europa Clipper mission, which is planned for launch in the 2020s.

Determining the shape of the moon's orbit will help resolve the question of its mysterious origin. A tight circular orbit would indicate that MK 2 is likely the result of a collision between Makemake and another KBO. Conversely, if the moon is in a wide, elongated orbit, it is more likely to be a captured object from the Kuiper Belt. In either case, the event would have probably occurred several billion years ago, in our primeval Solar System.

However, the models become somewhat more complicated when different forms of ice are taken into consideration. The ice floating around in a glass of water is termed Ice I. Ice I is the least dense form of ice, and it is lighter than water. However, at high pressures, like those that exist in crushingly deep subsurface oceans like Ganymede's, the ice crystal structures evolve into something considerably more compact. "It's like finding a better arrangement of shoes in your luggage--the ice molecules become packed together more tightly," Dr. Vance said in his May 1, 2014 statement. Indeed, the ice can become so extremely dense that it is actually heavier than water--and therefore somersaults down to the bottom of the sea. The heaviest, densiest ice of all is believed to exist within Ganymede, and it is called Ice VI.