PDF chapter test TRY NOW

1. Why was Duttada so confident about discovering a comet?
   
 
2. It was amateur astronomers who found many comets in previous times.
   
 
3. Before arriving at the conclusion of finding a comet, Duttada had done some good amount of calculation.
   
 
4. Fortunately, Duttada found a comet in a single night.