Telescopes

Some telescopes are on the earth this is because they are easier to maintain as it does not require launches to get astronaughts up there to fix them. Also they are cheaper having to make a telescope usable in space takes time and money, it also requires a launch which is expensive as well. It is easier to view the results as you can view them directly from the telescopes, instead of them having to be sent from space down to earth using microwaves then you need an antenna and other.

If the mirror is convex (bulges out, like a ball), objects in the mirror will appear smaller or further away, but the mirror will show a larger scene (called a wider field of view), including objects that a flat mirror would miss around the edges.

If the mirror is concave (like the inside of a dish), it can magnify images or focus light onto a small spot. A large concave mirror can focus sunlight and produce a very hot spot.

Hi ,

A reflective scope uses mirrors to focus the image and the light while a refractive scope uses curved glass lenses to focus the light and the image. Generally the reflector telescope is better for deep sky viewing and the refractor is better for lunar and planetary viewing. You can also find a compound telescope which uses both glass and mirrors which is better for general viewing.

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Chromatic aberration is a common issue in photography and optics, where different colors focus at different distances, leading to color fringing around edges. It can affect various design subjects such as photographs, digital images, and printed materials where precise color reproduction is essential. To reduce chromatic aberration, designers can use high-quality lenses, calibration tools, and software corrections during the design process.

HST has never been brought back to Earth since it was deployed, though bringing it back to Earth onboard a Shuttle after the mirror flaw was discovered was seriously discussed at NASA HQ.

In the end, the cost and risk of damage to HST should such a flight have occurred, would've outweighed the benefits of its observations to the scientific community and the Earth as a whole.

HST's current life will end when her gyros finally fail, as it requires the gyros to keep the telescope stationary for precise stellar observations. At that point (estimated to be sometime in the next 5-10 years), HST will be brought into the Earth's atmosphere for a controlled descent burnup over the ocean.

The Spitzer Space Telescope stays cool by using a passive cryogenic system that includes a large dewar filled with liquid helium to keep its instruments cold. The telescope is also shielded from the Sun and Earth by a sunshade to prevent it from heating up. Additionally, the telescope is designed to minimize heat-generating components and uses a combination of reflective and emissive materials to regulate temperature.

People have observed Halley's comet through telescopes, spacecraft missions, and by tracking its trajectory through the sky. Amateur astronomers also observe the comet during its periodic appearances every 75-76 years, providing valuable information about its behavior and characteristics.

Using the Hubble Space Telescope we have seen 13 billion light years into space, these are some of the very first galaxies to form after the big bang. [Search for "hubble space telescope ultra deep field images" to see the actual images.]

Although technology is always improving, we can never see much further than this point in time.

The problem is the time it takes for light to travel to Earth. The light we see from these very first galaxies have been travelling for 13 billion years to reach us, so really we are looking back in time. In them 13 billion years the light has been travelling to us, the universe has already expanded another 13 billion years. The reality is that many of the stars that make up these galaxies no longer exist in the same way we are seeing them today.

Theoretically, if the edge of the universe emitted visible light and stopped expanding today, we would still have to wait 13.7 billion years (the current age of the universe) before we would be able to notice. Therefore how far we can see is always governed by the time it takes for light to reach us.

If you think about it - the light we see from these very first galaxies was emitted before life and the Earth even existed! Bare in mind that light travels so fast it could go around the Earth 7 times in 1 second...

Fossil fuels are primarily composed of hydrocarbons, which are molecules made up of hydrogen and carbon atoms. The main types of fossil fuels include coal, oil, and natural gas, all of which were formed from the remains of ancient plants and animals that underwent geological processes over millions of years.

A reflecting telescope is an optical telescope which uses mirrors to bring the light to a focus. The first one was designed by Isaac newton.

Photography relies on principles of light, optics, and technology determined through scientific research and understanding. Concepts such as exposure, focal length, and depth of field are all based on scientific principles. Advances in science have also driven the development of camera technology, leading to improvements in image quality and usability.

Captain Cook was using a telescope to observe the transit of Venus across the path of the Sun. This event occurs when Venus passes directly between Earth and the Sun, appearing as a small dot moving across the Sun's surface. It is an important event in astronomy for determining the scale of the solar system.

Galileo was the first to use the telescope for astronomical observation.

Galileo based his telescopes on ones he saw Dutch sailers on trading ships using. So you have to go back to the Netherlands to find earlier telescope makers/users. It is likely the Dutch may have adapted the idea from someone else before them.

Galileo didn't actually invent the telescope, though he was one of the first to use it for astronomical observations. At the time he constructed his first telescopes, he was teaching at the University of Padua in Italy.

The first person to use a telescope for astronomical observation was Galileo Galilei in the early 17th century. He made groundbreaking discoveries, such as the moons of Jupiter and the phases of Venus, using his telescope.

the hubble space telescope was launched in 1990.. and will likely be decommissioned in 2012 or 2013

Reflecting telescopes are clearer according to scientists. These are the ones with mirrors. You could use a bunch of mirrors and reflect them to the same destination and procure an excellent picture.

Scope refers to the instrument's ability to view distant objects. In a telescope, scope means the range or extent of vision to observe celestial objects. In a microscope, scope refers to the range or magnification to view tiny objects up close. In a periscope, scope defines the field of vision to see over barriers or around corners.

The distance between two radio telescopes is important for interferometry, a technique used to combine signals from multiple telescopes to improve resolution and sensitivity. By measuring the time delay between the signals received at each telescope, scientists can determine the distance between them and use this information to create detailed images of celestial objects.

Most modern telescopes are reflecting telescopes because reflecting telescopes are generally more cost-effective and easier to build at larger sizes compared to refracting telescopes. Reflecting telescopes also suffer less from chromatic aberration and can have a simpler design with fewer optical elements.

A telescope usually has two lenses: the objective lens, which gathers and focuses light, and the eyepiece lens, which magnifies the focused light for viewing. Some telescopes may have additional lenses for specific functions, such as correcting aberrations or enhancing image quality.

1. Universe - the entirety of space-time, including all matter, energy, planets, stars, galaxies, and the contents of intergalactic space.
2. Uranus - the seventh planet from the Sun in our solar system, named after the Greek god of the sky.
3. Ultraviolet - a type of electromagnetic radiation with wavelengths shorter than visible light, often found in space and emitted by stars and other celestial bodies.

A refracting telescope uses a lens to bend or refract light, focusing it to create an image at the eyepiece. The objective lens captures and bends light to form an image at the focal point, which is then magnified by the eyepiece for observation.