Roots Astr and Audi

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The study of objects and matter out side the Earth's atmosphere

What does the root Astr mean?

Is a symbol * referring to footnotes

Any of the small rocky celestial bodies found between orbits of Mars and Jupiter

A short performance to show the talents of someone; an actor

Heard or able to be heard

Enormously or Inconceivably large or great.

Relating to the sound that is heard on a recording