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It is important to know at any age!

Of the four terrestrial, rocky planets of the inner Solar System (Mercury, Venus, our Earth, and Mars), both Mercury and Venus are moonless. Earth possesses one lone Moon, but it is a very large one--the fifth largest moon in our entire Solar System, in fact. Mars, on the other hand, has two tiny misshapen moons that resemble rocky potatoes, and are lumpy and dark, as they travel in their nearly circular orbits close to the plane of the Martian equator. The Martian moons, Phobos and Deimos, are probably asteroids that were captured by Mars long ago.



and here is another

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.



and finally

Earth's Moon consists of a core, mantle, and crust. The lunar core is proportionally smaller than other terrestrial bodies' cores. The iron-rich, solid inner core is 149 miles in radius, and it is encased within a liquid iron shell that is about 56 miles thick. A partly molten layer with a thickness of 93 milles surrounds the iron core.

Other facts:

"That thermally emitted radiation happens at the same wavelengths that we need to use to look for water. So in order to say with any confidence that water is present, we first need to account for and remove the thermally emitted component," Dr. Milliken continued to explain in the July 24, 2017 Brown University Press Release.



Several theories have been around for a long time that have attempted to explain how Earth's Moon was born. The first theory suggests that the Moon was once part of Earth, and that it somehow budded off about 4.5 billion years ago. According to this theory, the Pacific Ocean basin is the most likely site for where this occurred. A second theory postulates that the interaction of Sun-orbiting and Earth-orbiting planetesimals (the ancient building-blocks of planets), in the early years of our Solar System, caused them to disintegrate. Earth's Moon then coalesced out of the shattered debris of the pulverized planetesimals. A third theory proposes that the Earth and Moon were born together out of the original nebula that gave rise to our Solar System, and a fourth theory suggests that the Moon was really born somewhere else in our Solar System, and was ultimately captured by Earth's gravity when it traveled too close.



By studying how the four inner planets evolved and grew--using more than 250 computer simulations--the planetary scientists discovered that if the Moon-birthing blast had happened early, the quantity of material accreted onto Earth afterward would be enormous. If the impact had occurred late, the amount of material would be relatively small.