Toilet Paper Solar System Scale Model eighth grade lesson planetary distances using toilet paper System Solar Toilet Scale Paper Model

Toilet Paper Solar System Scale Model eighth grade lesson planetary distances using toilet paper System Solar Toilet Scale Paper Model

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It is important to know at any age!

Because the lunar atmosphere is very thin, it is far too sparse to prevent a steady shower of impacts from tumbling asteroids, comets, and meteoroids. These objects strike the lunar surface, leaving behind numerous crater scars. For example, Tycho Crater is over 52 miles wide.



and here is another

When a moon is in an orbit around its parent-planet, all is well--just as long as the gravity that is holding the moon together in one piece exceeds the powerful, relentless pull of its planet. Alas, if a moon wanders too close, and the tidal forces of the parent-planet exceed the gravitational bind of the unlucky moon, the moon will fall apart. This is termed the Roche limit. Earth's relatively large Moon is a very fortunate natural satellite, and the limit here is a bit under 10,000 kilometers--while our Moon is a safe 385,000 kilometers away from our planet.



and finally

For a very long time, planetary scientists favored the scenario that the duo of potato-shaped Martian moons were probably snared asteroids. However, the pair's circular orbits at the equator indicated otherwise. The orbits of the little moons suggested that they had really formed from a giant impact billions of years ago. The new research, published in the July 4, 2016 issue of Nature Geoscience, proposes that a massive 2,000 kilometer protoplanet crashed into the primordial Mars. The horrendous impact resurfaced most of the Martian surface and hurled a mass of debris, more than 100 times the mass of both Phobos and Deimos, into orbit around the Red Planet.

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This revised birth date for the Moon comes from a new study that takes a detour from the long-standing debate about its true age, and is basically in agreement with those planetary scientists who suggest a late-forming Moon. The new method that the scientists used to arrive at their conclusion eliminates numerous problems with traditional methods for calculating the Moon's age.



This new method is based on the fact that elements composing our planet's crust that have a tendency to combine with iron--such as iridium and platinum--arrived at Earth after this last giant collision.



All New to Mother Earth. This new belt of cosmos that the Sun is going through is all new to Mother Earth. This yearly trek is not the same as last year's. It is quite an adventure, full of surprises, for her to adapt and of course for us as her inhabitants to adjust as well.