By John Fisher


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The way in which the position was discovered is interesting. Observ ers through optical telescope have known for years that Jupiter's day lasts a little under ten hours. But the part of the radio source of Jupiter lying at the equator revolves more quickly than the parts at the poles> due to Jupiter's molten state, and takes about five minutes less to make a complete rev Hence, by seeing exactly how long the radio source takes to make a complete turn, radio astronomers olution. how near the poles the radio source was and how near the equator.

When when the sun is But radio no there is activity. unexpected an ex active, it can distort the radio atmosphere to such send out radio waves. impossible to receive properly. radio storms of the active sun are connected with tent that The It is is is sunspots and with sun flares. 41 The Big Dish 42 A sunspot on the sun's surface that can occasionally be seen with the naked eye when the sun is covered by a thin veil of cloud. ) spot is cooler than the rest of the sun and gives out less heat, but on the other hand, it is magnetically more active glass, A and can send out radio signals on the one-meter band for several days at a time.

It came when the star overheated and began to behave just like a hydrogen exploding, with atoms fusing together to form new bomb elements. Eventually the heat became so of the center of the star blew terrific that itself to pieces. had increased the whole And in the was many million times stronger than the sun's. ; it is still a radio source. Picture was taken in red light. (Mount Wilson and Palomar Observatories) The Big Dish 56 bang became visible. But very little of its original body remains, and what there is takes the form of cloud and dust.

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The big dish: The fascinating story of radio telescopes by John Fisher

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