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The brightest star in the night sky shows off this spring: How to see a scintillating Sirius

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A young girl wrote to me that she wanted to know why stars flicker at night .

Astronomer: The twinkling effect is caused by unstable state of the air through which a star's light must pass to reach our eyes.

Astronaut: A sky spangled with twinkled stars might seem to the average person like a spectacular backdrop for astronomers, it is an indicator of a very unstable atmosphere; awful if you were trying to get steady views peering through telescope.

The "scintillating effect" of such a bright star hovering so close to the horizon can be quite striking.

When and where to look, you should find a location that will afford you a clear and unobstructed view of the west-southwest horizon.

After May 6 , it will rapidly slide down into sunset fires and likely will end its evening visibility on May 11 .