After hundreds of years of detailed observation and study, our closest companion in the vast universe, Earth's moon, remains an enigma.
Six moon landings and hundreds of experiments have resulted in more questions being asked than answered.
The moon's mean density is 3.34 gm/cm3 (3.34 times an equal volume of water) whereas the Earth's is 5.5. What does this mean? In 1962, NASA scientist Dr. Gordon MacDonald stated: "If the astronomical data are reduced, it is found that the data require that the interior of the moon is more like a hollow than a homogeneous sphere."
On November 20, 1969, the Apollo 12 crew jettisoned the lunar module ascent stage causing it to crash onto the moon. The LM's impact (about 40 miles from the Apollo 12 landing site) created an artificial moonquake with startling characteristics - the moon reverberated like a bell for more than an hour, leading to the conclusion that the moon has an unusually light - or even no - core.
This and more strange moon facts in the following video.
Play free card games with friends in Spades, Euchre - JTM Hub
BalasHapusNo online multiplayer card games, but we 익산 출장마사지 have the best multiplayer card 사천 출장마사지 games! Play 제천 출장마사지 with 인천광역 출장안마 friends to 삼척 출장안마 challenge, compete, and win big!