one thousand-millionth of metre. One billionth of a meter.

Use of photos or electronic images, as in science. To obtain pictures by scanning them with a machine.

Occasion when something can be seen, e.g. a movie. To prove something to be true.

optical instrument designed to make distant objects appear nearer, containing arrangement of lenses, or of curved mirrors and lenses. slide or cause to slide into itself, so that it becomes smaller.

To think of something seriously and carefully.

Being finished; done; achieved. To finish or reach the end of doing something.

exactly alike.

In a faultless manner; without mistakes.

To put a ship into the water for the first time.

causing great enthusiasm and eagerness. To make someone feel happy, interested or eager.

With your attention, concentration on one thing. become able to see clearly.

money provided. To supply money for something.

person who is studying or has expert knowledge of one or more of natural or physical sciences. People who are trained in a science.

bear all or part of weight of.

Feature associated with someone or something.