Astronomy Astrophysics

Astronomy by Getmantsev Cosmic rays Sov.

By Getmantsev Cosmic rays Sov.

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In today’s market, telescope manufacturers dominate the 12-inch Dobsonian and smaller sizes because of the economies of scale. Larger sizes are economically attractive for homebuilt projects, and for those with the funds, can be obtained as commercially produced telescopes. The Newtonian telescope on a Dobsonian mount offers by far the biggest “bang-for-the-buck”. But they can be big and bulky, and the Newtonian optics still requires frequent alignment (Fig. 19). 30 2 What You Need to Know About Telescopes Fig.

Due to the compact size, Maks make excellent travel scopes. The natural question that arises from all these discussions of telescope design is: What telescope is ideal? Recalling the car analogy, it depends on the type of observing. 20 2 What You Need to Know About Telescopes For observing the Moon and planets, the answer is clear. Refractors offer the sharpest, clearest, and most contrasty images. But why? A discussion is needed on the difference between unobstructed and obstructed optics. As seen in Figs.

1) Fig. 1 Hubble image of M64 (NASA and The Hubble Heritage Team (STScI/AURA)) 46 3 Spring Objects M64, nicknamed the Black Eye Galaxy, was discovered by Edward Pigott on March 23, 1779, just 12 days before Johann Elert Bode found it independently on April 4, 1779. A year later on March 1, 1780, Charles Messier independently rediscovered it and cataloged it as M64. From Pigott’s notes on the discovery: “… on the 23rd of March [1779], I discovered a nebula in the constellation of Coma Berenices, hitherto, I presume, unnoticed; at least not mentioned in M.

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