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I am an amature astronomer and have been studying cosmology at Chicago`s Adler Planetarium ever since comet Hale Bopp appeared in 1997 but have always had an interest in the cosmos. I have a Celestron 4.5" f8 aperature 910 mm focal length Newtonian reflector telescope with an equatorial mount. Anyone in the Chicago area can have a look. I will need to know your age so I will know how detailed the answer should be.

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    K = Knowledgeability    C = Clarity of Response    P = Politeness
UserDateKCPComments
Jeff11/04/10101010 
Evan04/15/10 
Dante04/21/08101010Thank you for answering my question
radhika03/02/08101010 
Jess07/31/07101010Thank you very much for the help:)

Recent Answers from Doug

2015-09-27 Space: Black Holes:

You are both wrong. Don't confuse weight and volume with mass and density. A stellar black hole is a star that collapsed to infinate mass and density yet has no size and has infinate gravity known as a

2012-01-18 stars:

At the speed of light (186,000 miles per second) it would take 8 minutes to get to the sun, the closest star at 93,000,000 miles away. It would take 4.5 years to get to Proxima Centauri, the next closest

2010-11-02 buying advice:

It's a nice scope. Since I live in America I don't understand the metric system and am too old to learn it. If I knew how many inches 100mm is I could better answer this question. As a rule the best magnification

2010-06-03 Is earth getting closer to the sun ?:

Because Earth orbits the sun 67000 miles per hour and although it is "falling" the speed is enough to counteract (cancel) the pull of gravity. The same with the moon or artificial satellites. Swing a bucket

2010-04-12 telescope operation:

I will assume you read the instructions. I live at 42 degrees latitude and if the letters R/A on the right ascention ring are facing south and I am facing the R/A ring then I know I am set to go. I position

 

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