Posted January 25th, 2011
by admin
O asked: The star Betelgeuse is a supergiant with distance 150 pc and a radius equal to the radius of the earth’s orbit about the sun. How large a telescope is needed to just resolve this star at a wavelength of 550nm? At a wavelength of 5 microns? (Consider diffraction-limited observations only, and ignore seeing. Note: 1 pc = 1 parsec = 3.1 x 10^13 km)
Tags: Radius Of The Earth, Sun, Telescope
Posted in Astronomy & Space | 1 Comment »
Posted October 10th, 2010
by admin
Quantum asked: I was just wondering because I don’t have a telescope and I don’t really want to spend a fortune on one. Thanks!
Tags: Celestial Objects, Fortune, Telescope
Posted in Astronomy & Space | 5 Comments »
Posted September 16th, 2010
by admin
Sara Kosik asked: I want to get my husband a telescope for a Christmas present. We live on a small lake in the middle of nowhere, and the stars are always bright. I would love to get him a reasonably priced telescope to see stars and planets. Any suggestions? I would like to stay below $300. Is that possible?
Tags: Christmas, Middle Of Nowhere, Telescope
Posted in Astronomy & Space | 5 Comments »
Posted September 16th, 2010
by admin
Teru Mikami asked: This is for a project of ours. We’re supposed to make a simple telescope in our Physics class, is it possible to use a meniscus lens? How about two meniscus lenses? What are the effects? What kind of image is formed, an upright of inverted one?
Thank you.
Tags: Meniscus Lens, Physics Class, Telescope
Posted in Physics | 2 Comments »
Posted August 25th, 2010
by admin
Tags: Jupiter, Red Spot, Telescope
Posted in Astronomy & Space | 3 Comments »
Posted August 25th, 2010
by admin
ahriik asked: Whet are some good telescopes for beginners? I want to get into astronomy, so I believe a telescope is essential. What are some cheaper ones?
Tags: Astronomy, Telescope, Telescopes
Posted in Astronomy & Space | 3 Comments »
Posted July 17th, 2010
by admin
Jack asked: I want to conect my cannon camera to my telescope. It is a 58 mm camera and I was wondering where I could get an adapter to put on my telescope for a reasonable price. how do I hook the camera up to the telescope. Do I conect it to the eyepeice somehow?
Tags: Cannon Camera, Mm Camera, Telescope
Posted in Astronomy & Space | 2 Comments »
Posted July 17th, 2010
by admin
Freezing Temperature asked: Could an amateur portable telescope do it? Do you need a camera run overnight to see a nebula?
Seen with color.
Tags: Amateur, Nebula, Telescope
Posted in Astronomy & Space | 8 Comments »
Posted July 17th, 2010
by admin
Ian S asked: How do you calculate FWHM of the primary beam of the telescope from wavelength and dish size?
I assume there is some simple formula, and it goes something like Field of View ~= Lamda/Dish Diameter.
Tags: Dish Diameter, Telescope, Wavelength
Posted in Astronomy & Space | 2 Comments »
Posted May 31st, 2010
by admin
blackberrydude117 asked: A telescope with an objective lens that is converging and the eye piece is diverging. Would the diverging lens be inside the focal point etc?
Tags: Eye Piece, Ray Diagram, Telescope
Posted in Physics | 1 Comment »
