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Dimanche 23 Septembre 2007
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Dimanche 23 Septembre 2007
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[ The Moon ]
The Moon (Latin: Luna) is Earth's only natural satellite,
and the fifth largest moon in the Solar System.
The average centre-to-centre distance from the Earth to
the Moon is 384,403 km (238,863 mi)
which is about 30 times the diameter of the Earth.
The Moon has a diameter of 3,474 km (2159 mi)—
slightly more than a quarter that of the Earth. This means that
the volume of the Moon is close to 1/50th that of Earth.
The gravitational pull at its surface is about 1/6th of Earth's.
The Moon makes a complete orbit around the Earth every 27.3 days,
and the periodic variations in the geometry of the Earth–Moon–Sun
system are responsible for the lunar phases that repeat every 29.5 days.
The Moon is the only celestial body to which humans have travelled
and upon which humans have landed. The first artificial object
to escape Earth's gravity and pass near the Moon
was the Soviet Union's Luna 1, the first artificial object to impact
the lunar surface was Luna 2, and the first photographs of
the normally occluded far side of the Moon were made by Luna 3,
all in 1959. The first spacecraft to perform a successful lunar soft
landing was Luna 9, and the first unmanned vehicle to orbit
the Moon was Luna 10, both in 1966. The United States (U.S.)
Apollo program achieved the only manned missions to date,
resulting in six landings between 1969 and 1972. Human exploration
of the Moon ceased with the conclusion of the Apollo program,
although, as of 2007, several countries have announced plans to
send either people or robotic spacecraft to the Moon.
and the fifth largest moon in the Solar System.
The average centre-to-centre distance from the Earth to
the Moon is 384,403 km (238,863 mi)
which is about 30 times the diameter of the Earth.
The Moon has a diameter of 3,474 km (2159 mi)—
slightly more than a quarter that of the Earth. This means that
the volume of the Moon is close to 1/50th that of Earth.
The gravitational pull at its surface is about 1/6th of Earth's.
The Moon makes a complete orbit around the Earth every 27.3 days,
and the periodic variations in the geometry of the Earth–Moon–Sun
system are responsible for the lunar phases that repeat every 29.5 days.
The Moon is the only celestial body to which humans have travelled
and upon which humans have landed. The first artificial object
to escape Earth's gravity and pass near the Moon
was the Soviet Union's Luna 1, the first artificial object to impact
the lunar surface was Luna 2, and the first photographs of
the normally occluded far side of the Moon were made by Luna 3,
all in 1959. The first spacecraft to perform a successful lunar soft
landing was Luna 9, and the first unmanned vehicle to orbit
the Moon was Luna 10, both in 1966. The United States (U.S.)
Apollo program achieved the only manned missions to date,
resulting in six landings between 1969 and 1972. Human exploration
of the Moon ceased with the conclusion of the Apollo program,
although, as of 2007, several countries have announced plans to
send either people or robotic spacecraft to the Moon.
• • • • • • • • • • • • • •
Vocabulary
1.satellite - ดาวเล็กที่หมุนรอบดาวเคราะห์ , ดวงจันทร์
2.system - ระบอบ , ระเบียบ , แผนการ , วิธี
3.average - คนธรรมดา , ส่วนมาก
4.distance - ระยะทาง , หนทางไกล , นานมาแล้ว
5.diameter - เส่นผ่าศูนย์กลางของวงกลมหรือรูปไข่
6.gravitation - เคลื่อนเข้าไปด้วยอำนาจการดึงดูด , โอนเอียงเข้าหา
7.surface - ผิวพื้น , ด้านหน้า
8.periodic - เป็นบางครั้งบางคราว , เป็นระยะๆ
9.geometry - เรขาคณิต
10.celestial - ที่อยู่บนฟ้า
11.upon - ใช้เท่ากับ on เมื่อเป็นบุพบท
12.artificial - ปลอม , ทำขึ้นเอง , ไม่แท้
13.occlude - ทำให้บัง , อุด , กีดกัน
14.vehicle - ยาน , พาหนะ
15.conclusion - อวสาน , สิ้นสุด , จบ , ยุติ
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