Astronomy: Measuring Star Brightness
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Questions and Answers

The star's brightness as seen from Earth is its _______________ brightness.

apparent

A star's _______________ brightness is the brightness the star would have if all stars were the same standard distance from earth.

absolute

The distance that light travels in one year at a speed of 300 000 km per second is called a _______________ year.

light

The closer a star is to Earth, the greater its apparent change of _______________.

<p>position</p> Signup and view all the answers

Astronomers group stars into five types: Neutron stars, white dwarfs, medium-sized stars, _______________, and supergiants.

<p>giants</p> Signup and view all the answers

A light year is about 9.5 trillion ______ or 9 500 000 000 000 km.

<p>km</p> Signup and view all the answers

The closest star is Proxima Centauri, 4.2 ______ years from Earth.

<p>light</p> Signup and view all the answers

The most element in stars is ______, the lightest element that make 60% to 80% of the total mass of a star.

<p>hydrogen</p> Signup and view all the answers

Polaris, commonly known as the ______ Star, is the brightest star in the constellation Ursa Minor (Little Dipper).

<p>North</p> Signup and view all the answers

Stars are used to tell the time at ______.

<p>night</p> Signup and view all the answers

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