Moon Important Facts
- Moon Circumference: 11,000 km. Diameter: 3475 km. Gravitational pull: 1/6th of Earth.
- Its orbit around earth is elliptical. The maximum distance (Apogee) of the moon from the earth is 406,000 km and the minimum distance (Perigee) is 364,000 km. the average distance is 3,82,200 km.
- All other satellites (except Charon) have sizes below 1/8th the size of mother planets. But moon is about 1/4th the size of earth.
- Takes 27 days, 7 hrs, 43 min and 11.47 sec to complete one revolution around earth.
- Rotates on its axis in exactly the same time as it takes to complete one revolution. That is why we see only one side of the moon (only 59% of its surface).
- To our unaided vision, moon seems to be made-up of bright and dark patches. The bright parts are the mountains and highlands, while the darker patches are low – lying planes.
- The highest mountains on moon are Liebnitz Mountains, which are 10,660 m high. They are situated at moon’s South Pole.
- Moon has no atmosphere, no twilight and no sound.
- Moonlight takes 1.3 sec to reach earth.
- It has a low albedo (amount of sunlight reflected). It reflects only 7% and the rest is absorbed (Earth : 30%, Venus: 70%)
- Neil Armstrong and Buzz Aldrin reached moon on July 20, 1969 on Apollo XI and set the foot on. July 21, 1969 (landing spot is called Sea of tranquility).
Moon Some Important Facts
- Moon Distance from Earth – 3,82,200 km
- Moon Diameter – 3,475 km
- Moon Mass (with respect to Earth) – 1 : 8.1
- Ratio of Gravitational Pull of Moon and Earth – 1 : 6
- Part of Moon not visible from Earth – 41%
- Maximum distance from Earth (Apogee) – 4,06,000 km
- Minimum distance from Earth (Periqee) – 3,64,000 km
- Revolution period around Earth – 27 days, 7 hrs, 43 min and 11.47 sec
- Rotation period – 27 days, 7 hrs, 43 min and 11.47 sec
- Atmosphere – Absent
- Highest mountain – 35,000 ft (Leibnitz Mts)
- Time taken by moonlight to reach Earth – 1.3 sec
- Rotation speed – 3,680 kmph
- Speed of revolution around Earth – 3,680 kmph