Saturday, August 28, 2010

Bright Jupiter and much dimmer world


The end of August and the beginning of September sees bright Jupiter climbing in the east as evening darkness falls. By 10 p.m. it is an unmistakable object. For a bonus, aim a pair of binoculars at the bright planet. Half way towards the edge of the field of view to the upper right lies a star. A star it is not. That is Uranus, the seventh planet from the sun.

If you look closely, you will notice that Jupiter shows a tiny disk, while Uranus is mere a pinpoint. That is because Uranus is about five time farther away and only one-third as wide.

Such is our view from Earth.

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