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WordWorth | 1994-03-10 | 2.6 KB | 15 lines |
- The distances between the stars scattered throughout space are enormous. Even
- in our solar system, which is the name given to the sun and the planets,
- distances are very large. If we represented the Earth by a golf ball, the sun
- would be equivalent to a sphere 4.5 metres across and nearly 0.5 km away. In
- fact the distance between the Earth and the sun is about 150,000,000 km. This
- distance, called an astronomicle unit, is sometimes used as a unit of
- measurement in astronomy. An even larger unit is the light-year, which is the
- distance travelled by light in one year; it is equal to about 9.5 million
- million km.
- The galaxy to which our solar system belongs is called the Milky Way. It is a
- whirling wheel of stars, some 100,000 light years across and 10,000 light years
- thick. Our nearest neighbouring galaxy, Alpha-Centauri, is 40 million million
- km away.
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