Blogs and articles about space
The Hubble’s mirror is 96 inches in diameter. At full magnification of 96X60 = 5,760 power the closest it could image Mars is at Mars closest opposition every 15 years at distance of 34,600,000 miles is the distance of Mars divided by Hubble maximum power equals seeing Mars as though it were 6,007 miles away. …
What was the main problem with refracting telescopes? The two problems with refracting telescopes are a chromatic aberration and spherical aberration. How does a refracting telescope work? Refracting telescopes work by using two lenses to focus the light and make it look like the object is closer to you than it really is. Both lenses …
What type of telescope suffers from spherical aberration? A famous example of spherical aberration is given by the Hubble Space Telescope (HST), which suffered from spherical aberration due to a mistake during the manufacture of its (hyperbolic) 2.4m mirror, as shown in figure 40. Do refracting telescopes suffer from chromatic aberration? Chromatic aberration is a …
A simple refracting telescope consists of two lenses, the Objective and the eyepiece. Basically the objective lens produces an image of a distant object at its focus and the eyepiece lens magnifies this image. Does a refracting telescope have an objective lens? Most refracting telescopes use two main lenses. The largest lens is called the …
The main reason we put telescopes into space is to get around the Earth’s atmosphere so that we can get a clearer view of the planets, stars, and galaxies that we are studying. What is the purpose of an astronomical telescope? telescope, device used to form magnified images of distant objects. The telescope is undoubtedly …
Why do single-dish radio telescopes have poor resolving power compared to optical telescopes of the same diameter? Because the size of diffraction fringes is proportional to the wavelength of light being focused, and radio waves have longer wavelengths than visible light. Do radio telescopes have better resolution than optical telescopes? Radio telescopes have to be …
However, space telescopes that make their observations in the infrared range – that is, thermal radiation – must be cooled. This is because the telescope itself has a certain temperature and continually radiates heat that would interfere with the measurements taken by the heat sensor. Why must telescopes observing at long infrared that is far-infrared …
Cooldown refers to the telescope cooling down to the ambient temperature, and thus no longer heating the air around it. Until that happens, rising currents of warm air off the optics and other components will degrade the view. Why do you need to cool a telescope? However, space telescopes that make their observations in the …
Why must telescopes observing at long infrared (that is, far-infrared) wavelengths be cooled to low temperatures? To reduce thermal radiation from the mirror and detector parts of the telescope. Why are near infrared telescopes located on mountaintops and ultraviolet telescopes in Earth orbit? Why are near-infrared telescopes located on mountaintops and ultraviolet telescopes in Earth …
Galileo states that he solved the problem of the construction of a telescope the first night after his return to Padua from Venice and made his first telescope the next day by using a convex objective lens in one extremity of a leaden tube and a concave eyepiece lens in the other end, an arrangement …