Ptolemaic Solar System ptolemys geocentric model astro navigation demystified System Solar Ptolemaic

Ptolemaic Solar System ptolemys geocentric model astro navigation demystified System Solar Ptolemaic

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A little interesting about space life.

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.



and here is another

The Burmese month of Kason (April/May), the second month of the Burmese year, has arrived and 'Kason la pyei', the Full-moon of Kason marks an important date for Burmese people, in general, and Burmese Buddhists, in particular. It is a month of commemoration and anticipation. Why this is so you will learn while reading this article.



and finally

Born approximately 4.51 billion years ago, Earth's companion world formed soon after our own planet's birth in the primordial Solar System. The average separation between Earth and Moon is about 238,000 miles (1.28 light-seconds), and it is locked in synchronous rotation with Earth--meaning that it always shows us the same face. The near-side of our Moon is known for its bewitching dark volcanic maria (Latin for seas) that are located between large impact craters, as well as for its very ancient, bright crustal highlands. The lunar surface is really extremely dark--even though it appears to be very bright in the night sky above our planet--with a reflectance only a bit higher than that of old asphalt. The prominent position of our lunar companion in the dark midnight sky, as well as its rhythmic and regular cycle of phases, made our Moon an important influence on human culture ever since ancient times--especially in mythology, art, language, and on calendars.

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The new study, which Dr. Milliken co-authored with Dr. Shuai Li, a postdoctoral researcher at the University of Hawaii and a Brown University graduate, is published in the July 24, 2017 issue of the journal Nature Geoscience. The research was part of Dr. Li's doctoral thesis.



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.



There is an important distinction between the way giant planet systems form--such as those belonging to Jupiter, Saturn, Uranus, and Neptune--and the way that the rocky planets such as Earth, and the dwarf planet, Pluto, take shape. The gaseous giant planets are surrounded by rings, a myriad of moons, and a vast number of tiny dancing moonlets, whereas the rocky planets have none, or only one moon, and no rings to be seen. Until this new model was developed, two scenarios were generally used to explain how the regular moons of our Solar System were born. These two commonly used explanations suggest that the moons of Earth and Pluto came into being following catastrophic impacts. They further suggest that the moons of the giant, outer planets were born in a nebula floating around the newborn gigantic planet. They fail, however, to explain the distribution and chemical composition of the moons circling the gigantic outer four. Something, therefore, up until now, has been missing.