THIS DAY IN SCIENCE: Bali Tiger Is Extinct in 1937

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Using Parallax: How Far is that Star?

Using Parallax: How Far is that Star?

Introduction Since the distances to the stars cannot be measured directly, astronomers use a variety of techniques including triangulation and parallax, comparison of absolute and apparent magnitude, and Cepheid variables. Triangulation is an indirect method of...
Teacher Demo: Bright Star or Close Star?

Teacher Demo: Bright Star or Close Star?

When you gaze up in the night sky, some stars will be very bright while other stars are barely visible to the unaided eye. With the aid of binoculars, you may be able to observe different colours in the stars. The brightness and colour of a star depends on three...
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