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The Earth and the Moon form the Earth-Moon satellite system with a shared center of mass, or barycenter. This barycenter is 1,700 km (1,100 mi) (about a quarter of Earth's radius) beneath the Earth's surface. The Moon's orbit is slightly elliptical, with an orbital eccentricity of 0.055. [1]
- Origin of the Moon
The origin of the Moon is usually explained by a Mars-sized...
- Lunar phase
As the Moon waxes (the amount of illuminated surface as seen...
- The Moon
Missions to the Moon have been conducted by the following...
- Origin of the Moon
The origin of the Moon is usually explained by a Mars-sized body striking the Earth, creating a debris ring that eventually collected into a single natural satellite, the Moon, but there are a number of variations on this giant-impact hypothesis, as well as alternative explanations, and research continues into how the Moon came to be formed.
簡歷. 鄧凱文為港泰混血兒。. 自小便習慣獨處，經常在家中自言自語，並將模擬日常對話視作一場音樂劇。. 逐漸音樂就成為她自娛自樂的途徑，亦變成她的第二語言。. 2015年，與朋友創立名為School Busk的Busking Team，並在隊內擔任Vocalist。. 歌手 黃淑蔓 也是主音 ...
As the Moon waxes (the amount of illuminated surface as seen from Earth increases), the lunar phases progress through the new moon, crescent moon, first-quarter moon, gibbous moon, and full moon phases.
Missions to the Moon have been conducted by the following nations and organisations (in chronological order): the Soviet Union, the United States, Japan, the European Space Agency, China, India, Luxembourg, Israel, Italy, South Korea, the United Arab Emirates, Russia, Mexico, and Pakistan.
MissionMissionSpacecraftLaunch Date1Pioneer 017 August 1958223 September 19583Pioneer 111 October 1958411 October 1958Earth and the Moon orbit about their barycentre (common centre of mass), which lies about 4,670 km (2,900 mi) from Earth's centre (about 73% of its radius), forming a satellite system called the Earth–Moon system.
The Moon is Earth's only natural satellite. We usually see it in the night sky and also during the day. Some other planets also have moons or natural satellites. Our moon is about one-fourth of the width of the Earth. Because it is far away it looks small, about half a degree wide. The gravity on the moon is one-sixth of the Earth's gravity.
