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It is important to know at any age!

The Kuiper Belt, sometimes called the Edgeworth-Kuiper Belt, is a region located in our Solar System's outer limits beyond the realm of the eight major planets. It extends from the orbit of Neptune to approximately 50 AU. Neptune's average distance from our Sun is about 30.1 AU--its perihelion is 29.8 AU, while its aphelion is 30.4 AU.



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Galileo Galilei first spotted the planet Neptune with his primitive "spyglass" on December 28, 1612. He observed it again on January 27, 1613. Unfortunately, on both occasions, Galileo thought that the giant, remote planet was a fixed star, appearing near the planet Jupiter in the dark night sky. Because of this mistake, Galileo is not credited with the discovery of Neptune.



and finally

"The good news is that our models show that observations of a wet Moon are not incompatible with a Giant Impact origin," Dr. Nakajima explained in the February 26 2018 Carnegie Institution Press Release.

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Discovering the water content of volcanic deposits on our Moon using orbital instruments presents quite a challenge. Planetary scientists use orbital spectrometers to measure the light that skips off of a planetary surface. By determining which electromagnetic wavelengths of light are reflected or absorbed by the surface, the scientists can then get an idea of which minerals and other compounds are present.



In the fourth century BCE, Aristotle recorded that Mars vanished behind Earth's Moon during an occultation. This suggested that the planet was farther away than our Moon. The Greek astronomer, Ptolemy, who lived in Alexandria, attempted to solve the problem of the orbital motion of the Red Planet. Ptolemy's collective works and model on astronomy was presented in his multi-volume collection, titled the Almagest. The Almagest became the authoritative work on Western astronomy for the next 400 years. Ancient Chinese astronomers were also aware of the existence of Mars by no later than the fourth century BCE. In the fifth century CE, the Indian astronomical work titled Surya Siddhanta proposed a measurement of the estimated diameter of Mars. In East Asian cultures, Mars is usually referred to as the "fire star"--based on the Five Elements: fire, wood, metal, water, and earth.



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.