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Interesting facts about space.

Last night there was a full moon. One of my dogs was very on edge, starting at every sound, staring out into the darkness at something I could neither hear nor see. The other 4 dogs were sound asleep. Did she sense something different about the moonlit night?

Neptune, the eighth major planet from the Sun, and its neighboring sister-planet, Uranus--the seventh planet from the Sun--are both classified as ice-giants because their large cores are icy, and they never managed to acquire the immense gaseous envelopes of the two true gas-giants, Jupiter and Saturn. The gas giants are possibly composed entirely of gas and liquid, although they may have small solid cores. In contrast, the ice-giants have large solid cores and thinner atmospheres. The two gas-giants, being mostly atmosphere, are very lightweight for their size. Saturn is the lightest planet in our Solar System, despite its immense diameter. In fact, Saturn is light enough to float like a huge raft in water, provided there was an ocean big enough for it to bob around in.

In their research, the planetary scientists combined several radar observations of heat given off by Ligeia Mare. They also studied data collected from a 2013 experiment that bounced radio signals off Ligeia Mare. The results of that experiment were presented in a 2014 paper led by Cassini radar team associate Dr. Marco Mastroguiseppe of Cornell University in Ithaca, New York, who also was part of the new study.

Other facts:

The Giant-Impact Theory, alternatively termed the Theia Impact, or Big Splash Theory, proposes that Earth's Moon was born from the debris remaining from a catastrophic collision, that occurred about 4.3 billion years ago, between the primordial Earth and an unfortunate protoplanet, that was about the size of Mars. The Earth's Moon-forming collision would have occurred when our Solar System was still forming during the Hadean eon. The Hadean eon occurred about 20 to 100 million years after our Solar System emerged from its frigid, dark natal cloud of gas and dust. The doomed impacting protoplanet, often called Theia, received its name in honor of a Titan in Greek mythology who was the mother of Selene, the Moon goddess. An analysis of lunar rocks, published in 2016, indicates that this catastrophic crash was a direct hit--causing a thorough mixing of both Earth-stuff and Theia-stuff. The Giant-Impact Theory is the favored scientific explanation for the birth of Earth's Moon.

Mars may be circled by many moons smaller than 160 to 330 feet in diameter, and a ring of dust has been predicted to circle Mars between Phobos and Deimos.

However, the theory that has long been held to be the most likely explanation is the giant impact theory, suggesting that the Mars-sized body named Theia smashed into the ancient Earth billions of years ago. The monumental blast resulted in a portion of the primordial Earth's crust to be hurled off screaming into Space. This ancient catastrophe tossed a multitude of somersaulting moonlets into the sky, and some of this material was ultimately captured into orbit around the ancient Earth about 4.5 billion years ago, where it finally was pulled together by the force of gravity to become the Moon.