Telescopes

Optical telescopes rely on light waves being sent from the object being observed. Weather conditions (clouds) can block the light from the object reaching the telescope's lens. Radio telescopes only search for radio-waves being sent from the object under scrutiny - which are not (as a rule) affected by weather conditions on earth.

It is a paraboloid, which focusses the light from a star down to a single point which can then be looked at through the eye lens or eyepiece.

A small aperture.

Isaac Newton is best known for his laws of motion and universal gravitation. He also made significant contributions to the development of calculus and the understanding of optics through his work on the nature of light.

Well, most telescope tubes are opaque to prevent the admission of undesired external nonimage forming light that might overwhelm the desired image forming light passing from the objective end to the eyepiece/camera end. They also provide a mechanical support to keep the various components of the telescope properly aligned.

How SALT was fananced

Sometimes when you look up at the sky you'll see a meteor, by chance. You can't know in advance when you'll see one, and they only last a fraction of a second or a few seconds at most - but at some times of the year there are more than at others (the so-called meteor showers).

Planets viewed through a telescope typically appear as small, round discs with some surface features visible. They may also show distinct colors, such as the reddish hue of Mars or the white clouds of Jupiter. The larger planets, like Jupiter and Saturn, can also reveal their moons as tiny specks of light nearby.

A positive lens is also called a magnifying lens. It has convex surfaces and it has a measureable focal length where it produces an inverted image of a distant object. The power in dioptres is the reciprocal of the focal length in metres.

Gunpowder was not invented during the Middle Ages; it was actually invented in China before that time. Eyeglasses, mechanical clocks, and telescopes, however, were innovations that emerged during the Middle Ages.

Because the visible light coming from the stars is so faint that during the day the light form our local star (the Sun) is so bright that it swamps the starlight.

Thus to make observations using visible light, astronomers have to do so at night.

The primary goals of Webb are to study galaxy, star and planet formation in the Universe. To see the very first stars and galaxies form in the early Universe, we have to look deep into space to look back in time (because it takes light time to travel from there to here, the farther out we look, the further we look back in time). The Universe is expanding, and therefore the farther we look, the faster objects are moving away from us, redshifting the light. Redshift means that light that is emitted as ultraviolet or visible light is shifted more and more to redder wavelengths, into the near- and mid-infrared part of the light spectrum for very high redshifts.

Therefore, to study the earliest star formation in the Universe, we have to observe infrared light and use a telescope and instruments optimized for this light. Star and planet formation in the local Universe takes place in the centers of dense, dusty clouds, obscured from our eyes at normal visible wavelengths. Near-infrared light, with its longer wavelength, is less hindered by the small dust particles, allowing near-infrared light to escape from the dust clouds. By observing the emitted near-infrared light we can penetrate the dust and see the processes leading to star and planet formation. Objects of about Earth's temperature emit most of their radiation at mid-infrared wavelengths. These temperatures are also found in dusty regions forming stars and planets, so with mid-infrared radiation we can see the glow of the star and planet formation taking place. An infrared-optimized telescope allows us to penetrate dust clouds to see the birthplaces of stars and planets.

(Also, at one of the other commenters, Webb is not Hubble's replacement, but rather a successor.)

There's no aberration with the main MIRROR of the telescope, because light doesn't go through the mirror. A reflecting telescope will have SOME chromatic aberration, because every reflecting telescope has at least one refracting lens; the eyepiece. Light goes THROUGH that lens, and light passing through the glass lens will generate some chromatic aberration.

Telescopes for children can be found at some toy stores such as Toys R Us, FAO Schwarz, Department stores like Sears and Target, as well as some book stores, such as Barnes and Noble. They are also available online at Amazon, eBay, Rocket Robert, Optics Planet and Dave Trott, among others.

A bigger one.

the reflecting telescope was!!

If your were on another planet or the moon yes. If you are on earth you cannot observe it (in its entirity) through a telescope unless you are placed off of the planet.

I assume the question is why we spend so much money putting telescopes in orbit when we have ground-based telescopes.

The answer is because the atmosphere creates a lot of distortions that limits how far our telescopes can see, and what they can see.

Astronomers, as all scientists, are explorers; they are not content to keep looking at the same objects with the same level of detail over and over. It is much like the way so many people like HD television over old analog t.v. ... when looking out into space and distant stars, the atmosphere creates distortions and cannot see very well during the daylight (just as you cannot see stars during daylight). The problem is getting worse by the problem of light pollution -- all those security and traffic lights on all night long in cities creates a glow of light that makes stargazing even more difficult, even at night. By putting telescopes into space, they are no longer hindered by atmospheric distortions and are unaffected by light pollution from our cities. A telescope in space versus on the ground is analagous to an H.D. television versus an old analog t.v. -- there is much more you can see, and what you can see is in greater detail.

NASA?

One of the best places to purchase a Tasco telescope would be on the company's own website, as it will offer you the best availability for warranty/insurance etc for your telescope.

reflecting telescopes

infrared radiation

They must be launched in to space because there is a better veiw in space than from earth.

the advantage of this is by using the telkescope you can collect and focus radiation and it do not suffer from chromatic aberation because all the wavelength will redlect off the mirror the advantage of this is by using the telkescope you can collect and focus radiation and it do not suffer from chromatic aberation because all the wavelength will redlect off the mirror the advantage of this is by using the telkescope you can collect and focus radiation and it do not suffer from chromatic aberation because all the wavelength will redlect off the mirror