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Name: Moon

  • Age: 4.5 billion years old
  • Mass: 73,476,730,924,573,500 million kg (0.0123 x Earth)
  • Shape: Egg-shaped
  • Family: Member of our solar system, satellite of earth
  • Circumference at Equator: 10,917.0 km
  • Length of Orbit: 27.3 Earth days
  • Surface Temperature: -233 to 123 °C
  • Active Relationships: Orbits around the earth
  • Distance from earth: 384’467 km (~364 397 km at perigee, ~406 731 km at apogee)
  • Traveling by car: 130 days
  • Traveling by rocket:13 hours
  • Traveling by light speed:1.52 sec
  • Diameter: 3476 km (1/4 of the Earth’s)
  • Gravity acceleration: 1.62m/sec2 (1/6 of Earth’s)
  • Revolution period: 27.3217 days
  • Mean Synodic period(new moon to new moon): 29.530588861 days
  • Mean orbital velocity: 1.023 km/sec
  • Age of Oldest Rock Collected: 4.5 Billions yrs.
  • Rocks Collected By Apollo: 842 pounds
  • No. of Men Who Have Walked on Surface: 12

Few Quick Facts about our Moon

  1. The Moon is the only natural satellite of the Earth, and the 5th largest satellite in the Solar System. And called Luna by the Romans, Selene and Artemis by the Greeks, and many other names in other mythologies.
  2. The Moon is estimated to be born 4.5 billion years ago when a large object hit the Earth and blasted out rocks that came together to orbit round the Earth.
  3. The Moon is the second densest satellite after Io (a satellite of Jupiter). It is in synchronous rotation with Earth meaning the same side is always facing the Earth. It rotates at 10 miles per hour compared to the earth’s rotation of 1000 miles per hour.
  4. It is the largest natural satellite of a planet in the Solar System relative to the size of its primary, having 27% the diameter and 60% the density of Earth, resulting in 1⁄81 its mass.
  5. The surface area of the moon is 14,658,000 square miles or 9.4 billion acres. Only 59% of the moon’s surface is visible from earth.
    From Earth, we always see the same side of the moon; the other side is always hidden. It has no global magnetic field. The Moon’s diameter is a quarter (1/4) of the Earth’s (3,475 km compared to 12,742 km).
  6. The Moon is moving away from the Earth by approximately 3.8cm a year. The Moon’s linear distance from the Earth is currently increasing at a rate of 3.82±0.07cm per year, but this rate is not constant.
  7. The gravity of the Moon, the pull which it exerts on the Earth, causes two high tides on the Earth every day – one every 12 hours and 25 minutes.
  8. The Moon takes about 27 days (27 days, 7 hours, 43 minutes, 11.6 seconds) to go all the way around the Earth and return to its starting position.
  9. The Moon’s orbit around the Earth is a slightly squashed circle called an ellipse. Looking down from the North Pole we would see the Moon orbiting counterclockwise from west to east.
  10. The moon rotates around the Earth in an oval shape. When it is closest to the Earth, that is called perigee. When is it farthest, they call it apogee.
  11. The moon orbits Earth at an average speed of 2,288 miles per hour (3,683 kilometres per hour).
  12. The Moon travels a distance of 1,423,000 miles (2,290,000 kilometres) around the Earth.
  13. The volume of the Earth’s moon is the same as the volume of the Pacific Ocean. The surface of the moon has many things on it such as craters, lava plains, mountains, and valleys. Scientists believe the craters were formed around 3.5 to 4.5 billion years ago by meteors hitting the moon’s surface.
  14. A quarter moon and a half moon are the same thing. The quarter refers to the fraction of the lunar month which has passed, whilst the half describes the portion of the Moon’s disc which is visible.
  15. Easter is the first Sunday after the first Saturday after the first full moon after the equinox. (The equinox is quite often March 21, but can also occur on the March 20 or 22.)
  16. The moon causes many of the tides in the Earth’s oceans. This is because of the gravity force between the Earth and Moon.
  17. During full and new moons the gravitational forces of the Sun and Moon combine to produce the highest tides called Spring Tides.
  18. During quarter moons the gravitational forces of the Sun and the Moon oppose each other to produce the lowest tides called Neap Tides.
  19. An eclipse of the Sun can occur only at New Moon, while an eclipse of the Moon can occur only at Full Moon.
  20. The second full moon occurring within a calendar month is called a Blue Moon. The last was seen on 31 December 2009. Far from being a rare event this phenomenon occurs once every three years on average.
  21. The first space craft to send back pictures from the moon was Luna 3 (built by the Soviet Union) in October 1959.
  22. The last manned mission to the Moon was Apollo 17 in 1972 since then it has only be visited by unmanned vehicles.
  23. Only a tiny group of astronauts have ever set foot on the surface of the Moon. These were the astronauts on board the Apollo missions going from 1969 to 1972.
  24. The first person to walk on the Moon was the American astronaut, Neil Armstrong, who stepped out of his space landing craft, the Eagle, on 21 July 1969.
  25. The last person on the Moon was Gene Cernan, who followed his partner Jack Schmitt into the lunar lander on December 14, 1972.

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