Hi, we’re the kids from Eagles Wings, here in Japan,
and we want to talk about our solar system today. We often see pictures of our solar system like this. They show us the beautiful colors of the planets… and sometimes the scale of the size of the planets compared to one another. But they can’t really show us how far each planet is from the sun… or exactly how big our solar system really is. Take this one for example. It shows that Earth is bigger than Mars
and that Jupiter is bigger than Earth. But the proportions are not right. And it shows the nice colors of the planets. But not the real distances between them. So, today, we would like to show you the size of the planets… and the distance of each planet from the sun in a way that everyone can understand. What’s an everyday object we can use, that can represent the sun? We decided a basketball would make a great sun!
It’s round, and orange and kind of looks like the sun too. But actually the sun is white! But we also need lot’s of space! Where can we go,
that has lots of space, to show you our experiment? We’ve come to Minami Ashiyahama, here in the Osaka region of Japan. Isn’t it beautiful here. It’s a nice place for a walk or a bike ride, to do some fishing. Or to just sit and think about how big the universe is! A standard basketball is about 235mm in diameter. This is going to be our standard to calculate the scale of the solar system today. Now, if the sun was this basketball, how big do you think the earth would be? The size of this tennis ball, a golf ball, or maybe a BB pellet? Well, the sun is 1 million 390 thousand kms in diameter; which is 108 times the diameter of the earth! That means that, if the sun was this basketball, the earth would be a ball 2.16mm round. Only this big!
Even next to a BB pellet, our little blue earth looks tiny! But if the sun was a basketball, this is how big the WHOLE earth would be. It’s really tiny, isn’t it. In fact the Earth was so small that we dropped it and lost it, and had to make another one. Let’s look at some of the other planets too. If the sun was a basketball, then the Mercury would be under 1mm big. Venus would be about the same size as Earth. Mars, the little red planet, would be just over 1mm. Jupiter, the largest planet, would be just on 1 inch. Saturn, would be just on 20mm. And Uranus and Neptune would only be about 8mm. But what about distances. If Earth was this tiny ball, just how far away from our Basketball Sun do you think it would be? 1 meter? Maybe 5 meters? Maybe 20 meters. What do you think? Well, the earth is actually about 150 million kilometers from the sun. On this scale, that would make it about 25 meters away! Wow… you mean, this little ball, which is the whole earth… … would be 25m away from the basketball!? Let’s put it there now. And of course, there are other planets too. What two planets are between the earth and the sun? Can you remember? Mercury, is the closest to the sun, and at about 5000 km in diameter… it would be less than 1mm big on this scale. That’s right… and it would be about 10m away from the Sun. There’s one more planet between Mercury and the Earth,
and that is: Venus. It’s just a little bit smaller than earth,
and it would be about 18 m away from the sun. Before we introduce the other planets…
let’s think about the scale of all the planets in our solar system. What is the furtherest planet from the sun? If you said “Neptune” you’d be right! Pluto is no longer thought of as a planet for those of you who were wondering! Neptune is about 4 times the size of the earth… about like this! You may be surprised, but if the sun was this basketball…. then our little NEPTUNE here, would be 769 m away. That’s almost a kilometer, about 8 football fields away. And that’s exactly why we had to come to Ashiyahama to show you the scale of the planets. Let’s walk 769m to where NEPTUNE would be. Wow, 769m is a really long way. We decided to let the boys do it. That’s a really long way away!
Think about it! We can’t even see the Basketball sun from here, let alone the earth! And in between EARTH and NEPTUNE are
MARS: at 1.15mm big it would be 38.5m away from the sun. JUPITER, the biggest of all our planets, would be 24mm in diameter, about 1 inch. It would be 127m from the sun. SATURN, the planet with the beautiful rings around it, at 20 mm big, would be 228m away. And URANUS, at 8.6 mm big would be 487m away. And there it is… the scale of our solar system, if the sun was a basketball.