Archive for February, 2011
Optical Telescopes Images
Optical Telescopes images How do the big telescopes show NGC6543(cat eye nebulae) in 1965-1975? I want know the shape of NGC6543 in old pictures that taken with famus obsevatory in 1965-1975.Do the old pictures taken in1965-1975 show concentric gas shells around the plantary nebulae ,as well as that image taken with Nordic Optical Telescope and [...]