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k l a w m e t solar sys What’s it all about? of the planets and distances between them. The Solar System Walk is a fun way Time for blast off! Activity 1: Planet sizes What to do For each planet (and the Sun) we'll give you an object to represent it, the planet's actual diameter and the scaled diameter (so you can take your ruler in search of perfect planets). First find something to represent the Sun. The Sun actual: 1,400,000 km scaled: 140 cm 1/2 bed sheet To start, see if you can guess how big Earth would be if it were at the same scale as your Sun. Then guess the sizes of some of the other planets. Now, here are the planet sizes scaled down. Mercury 4,900 km 0.49 cm Popcorn kernel Venus 12,100 km 1.21 cm Mini-marshmallow Earth 12,800 km 1.28 cm Gobstopper Mars 6,800 km 0.68 cm Pea Jupiter 143,000 km 14.3 cm Football Saturn 120,000 km 12 cm Melon Uranus 51,800 km 5.18 cm Tennis ball Neptune 49,500 km 4.95 cm Small apple Pluto* 2,300 km 0.23 cm Peppercorn *now classified as a "dwarf planet" What did you learn? Planets The planets in our Solar System are very different in size. Did you realise just how small Mercury and Pluto are compared to the Sun? The next activity will now demonstrate just how big our Solar System is and how far apart the planets actually are. Activity 2: Planet distances What you’ll need mercury venus earth 4,900 A kmlarge - 1 mm 12,100 kmto - 2.4 mm 12,800 km - 2.6 mm park or walk (enough space walk about 1200 meters) Cut out each planet from the last page of this worksheet (get an adult to help). What to do Begin by placing something on the ground to mark the position of the143,000 Sun. From km that point walk in a straight line and place each planet on the ground in turn to saturn jupiter mark out the distances between each planet. (One very large stride is roughly mars 125,000 km - 24 mm 143,000 km 28.6 mm 6,800tokm - 1.4 mm equal a meter) 1. The Sun 6. Jupiter - 155.6m 2. Mercury - 11.6 m 7. Saturn - 284.8 m 3. Venus - 21.6 m 8. Uranus - 573.4 m 4. Earth - 30 m 9. Neptune - 897.8 m 5. Mars - 45.6 m 10. Pluto - 1182.0 m are average distances from the Sun – but you should be able to see just how much space there is in space. uranus neptune pluto 51,100 km - 12 mm 49,500 km - 9.8 mm 2,300 km - 0.4 mm Planets mercury venus earth 4,900 km - 1 mm 12,100 km - 2.4 mm 12,800 km - 2.6 mm 143,000 km saturn mars jupiter 6,800 km - 1.4 mm 143,000 km - 28.6 mm uranus neptune pluto 51,100 km - 12 mm 49,500 km - 9.8 mm 2,300 km - 0.4 mm 125,000 km - 24 mm