Astronomers need to ____ as much light as ____ from objects in outer space. Scientists ____ very accurate ____ instruments. They can be ____ to computers. These data-logging light meters ____ readings and ____ monitor changes in the ____ of light over time. Using the ____ to ____. We can use the ____. You will need: a ____ of card, a ____ of cocktail stick, a ____ of sticky tac or modelling clay. Mark the ____ on your sundial. ____ hours are to the ____. Carefully ____ the cocktail stick ____ the centre. ____ with a piece of sticky tac ____ the card. Place the shadow stick so that, when the ____ is sitting on a surface, the stick points ____.

Science

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