# Putting The Distance Between The Earth And Moon In Perspective

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1 Putting The Distance Between The Earth And Moon In Perspective In a spaceship, how long does it take to get to the moon? It depends on how fast the spaceship can travel. When the Apollo.astronauts went to the moon, it took about two days. How long would it take to fly in a 747 to the moon? A 747 airplane normally flies at about 400 miles per hour. The moon is about 250,000 miles away. So if we divide 250,000 by 400, we find that the plane would take 625 hours or 26 days to fly to the moon! Boy that would be a looong trip! Twenty-six days of eating airline food yuck! How Long would it take to drive to the moon? (65 mph) 250,000miles/65mph = 3846 hours or 160 days. How Long would it take to walk to the moon? (3 mph) 250,000miles/3mph = hours or 3472 days or 9.5 years

2 I. Build a Model Solar System (diameters and distance) Object Diameter Distance from Sun Sun 1 meter NA Mercury 4 mm 40 m Venus 1 cm 70 m Earth 1 cm 100 m Moon 3 mm 30 cm (to Earth) Mars 5 mm 150 m Jupiter 11 cm 500 m Saturn 9 cm 1000 m Uranus 4 cm 2000 m Neptune 4 cm 3000 m Pluto 2 mm 4000 m

3 II. SOLAR SYSTEM (Distances) 1 CM = 1,000,000 KM OBJECT MEAN DISTANCE FROM THE SUN (KM) SCALED DISTANCE FROM THE SUN Sun NA NA Mercury 58,000, cm Venus 108,000, cm Earth 150,000, cm Moon* 384, cm Mars 228,000, m Ceres** 420,000, cm Jupiter 780,000, m Saturn 1,430,000, m Uranus 2,870,000, m Neptune 4,500,000, m Pluto 5,900,000, m Alpha Centauri 250 MILES (the next closest star) * distance shown for the moon is distance from Earth ** Ceres is just one representative of what belt?

4 III. At the Speed of Light through the Solar System and Universe Light from the Earth to the moon Sun to Earth Sun to Mercury Sun to Venus Sun to Mars Sun to Jupiter Sun to Saturn Sun to Uranus Sun to Neptune Travel time 1.28 seconds 8.5 minutes 3 minutes 6 minutes 12.5 minutes 43 minutes 1 hour 2.6 hours 4 hours Sun to Pluto 5.4 hours Sun to the nearest star 4.3 years Sun to the furtherest stars 18 billion years

5 IV. SOLAR SYSTEM (diameters) OBJECT DIAMETERS OF THE OBJECTS 1 CM = 1,000,000 KM EQUATORIAL DIAMETER (KM) Sun 1,390, Mercury 4, Venus 12, Earth 12, Moon 3, Mars 6, Ceres 1, Jupiter* 142, Saturn 120, Uranus 51, Neptune 48, Pluto 2, Trivia SCALED EQUATORIAL DIAMETER (CM) If the sun was hollow it could hold 1,000,000 Earth s! The sun accounts for 99.8% of all the solar system. Meaning if you place all 9 Planets, 141 moons and satellites of the planets plus all the comets and asteroids on a balance scale, it would only add up to.2% of the solar system. *Note Jupiter can hold 1000 Earths This Jupiter is # 6 bird shot (which is 2-3 times to large)

6 V. SOLAR SYSTEM (weight on other planets) (Note I use a 20 oz pop bottle as reference) Celestial Object Gravitational Pull (Compared to Earth) Period of Revolution (Compared to Earth) Mercury oz Earth years Venus oz Earth years Earth oz Bottle 1.0 Earth year Mars oz 1.88 Earth years Jupiter oz 11.9 Earth years Saturn oz 29.5 Earth years Uranus oz 84.0 Earth years Neptune oz Earth years Pluto??? Earth years Sun oz or lbs Neutron Star* * The mass of Neutron Star is so great that if it were a teaspoon, it would weigh a billion tons.

7 How Vast Is Our Universe? It is so vast that it takes a beam of light (which travels some 700 million miles per hour) over 100,000 years just to cover the distance length of our galaxy called the Milky Way. But our galaxy is only one among many billions in the known universe. To illustrate the size of our universe, consider the following four examples: A. PAPER STACK MODEL 1. Let us say the thickness of a sheet of paper represents the distance from the earth to the sun (some ninety-three million miles). 2. To represent the distance to the nearest star we would need a seventy-one-foot high stack of paper. 3. To cover the diameter of our Milky Way galaxy would require a 310- mile high stack. 4. To reach the edge of the known universe would demand a pile of paper sheets thirty-one million miles high. B.ORANGE AND GRAIN OF SAND MODEL 1. Here an orange would represent the sun. 2. A grain of sand is the earth, circling the orange at a distance of thirty feet. 3. Pluto (most remote planet in our solar system) is another grain of sand, circling the orange at ten city blocks away. 4. Alpha Centauri (the nearest star) is 1300 miles away from the orange. C.HOLLOW SUN ILLUSTRATION 1. If the sun were hollow, one million, three hundred thousand earths could fit inside. 2. A star named Antares (if hollow) could hold sixty-four million of our suns. 3. In the constellation of Hercules there is a star which could contain 100 million of Antares. 4. The largest known star, Epsilon, could easily swallow up several million stars the size of the one in Hercules!

8 D.THE RELATIVE SPEED ILLUSTRATION 1. Our earth is traveling around its own axis at 1000 m.p.h. 2. It moves around the sun at 67,000 m.p.h. 3. It is carried by the sun across our galaxy at a speed of 64,000 m.p.h. 4. It moves in orbit around our galaxy at 481,000 m.p.h. 5. It travels through space at one million, three hundred and fifty thousand m.p.h. 6. Every twenty-four hours we cover 57,360,000 miles. 7. Each year we travel 20,936,400,000 miles across empty space. All the above is, of course, but a feeble attempt to illustrate the magnitude of space and of a universe which contains as many stars as there are grains of sand on all the seashores of the world.

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