Telescopes

It is not essential to have a secondary mirror on a Newtonian telescope, but the reason there is one is for practicality. If you mounted an eyepiece at the focus of the primary mirror, your head would be directly in the light path, blocking much of the light from entering the tube. The same reason applies to cameras, but with modern CCD cameras being circular and small, it is possible to mount one at the focus of the primary mirror. Indeed, doing this may block less light than a secondary mirror would, certainly in the case of a large aperture instrument (for example 300mm and above.)

Yes, it is safe to look at Venus through a telescope. Venus is bright enough not to cause any harm to your eyes when viewed through a telescope. Make sure not to look directly at the sun when observing Venus to avoid damaging your eyes.

launched in 1989 by NASA

studied cosmic background radiation

viewed in infrared and microwaves

it was a space telescope and needed to be kept cool as it observed in infrared

wasn't very sensitive but it confirmed ideas about early universe

finished it's mission in 1993

Yes, the Hubble Space Telescope has significantly improved space exploration by providing detailed images of distant galaxies, nebulae, and other celestial objects. It has helped scientists expand our understanding of the universe and has made groundbreaking discoveries, such as the age of the universe and the existence of dark matter.

Ground-based telescopes are typically larger and more cost-effective than space telescopes. They can be easily upgraded and repaired, and have the ability to be built in remote locations for better viewing conditions. Additionally, ground-based telescopes benefit from continuous improvements in technology and instrumentation.

Hans Lippershey, also known as Jan or Hans Lippersheim, was born around 1570 (exact date unknown) in Wesel, western Germany. After settling in the Netherlands, he became a maker of spectacles. Lippershey is credited with creating the design for the first practical telescope, after experimenting with different sized lenses. Lippershey is thought to be the first to apply for a patent for his design of an early telescope in 1608, as his patent application is the earliest record of an actually existing telescope. He demonstrated his invention before the Dutch Parliament on 2 October 1608, calling it a "kijker", meaning "looker" in Dutch. The patent was ultimately denied because it was believed that the details of his invention could not be kept secret. However, Lippershey went on to make several binocular telescopes for the States General.

The astronomer Galileo Galilei created a working design of the telescope in 1609 after receiving a description of Lippershey's invention.

No, Galileo was not the first person to look through a telescope. The invention of the telescope is credited to Hans Lippershey, a Dutch eyeglass maker, around 1608. Galileo improved upon the design and used it to make groundbreaking astronomical discoveries.

The diameter of the telescope aperture determines how much light the telescope can gather, which impacts the brightness and detail of the images it can produce. A larger aperture means more light can be collected, allowing for clearer and sharper views of celestial objects.

Neptune, Uranus, the dwarf planet Pluto, and all the exoplanets. 837 exoplanets had been discovered as at 2012-Sep-07. Mars, Venus, Jupiter, Saturn, Mercury and obviously Earth can be seen with the naked eye. All the rest were discovered by telescope. Seeing as we don't have warp drive, hyper-space or inter-dimensional travel, there is no other way to discover a planet except by observation. This is always done through a telescope, whether it be visible spectrum, IR, UV, radio etc

There is also some discussion that Neptune and Pluto were discovered by noticing the variation in the orbits of other planets. After the maths was done, telescopes were pointed at where we thought the source of the orbital variation would be, and Neptune and Pluto were discovered. So was the time of discovery, when we did the maths or when we first observed them through a telescope ... ?

I assume you mean the Hubble Space Telescope. Such space telescopes benefit from the lack of an atmosphere: there is no atmospheric distortion, which otherwise severely limits the image quality. The lack of an atmosphere also lets such telescopes see in frequencies that don't get down to Earth at all, for example infrared and ultraviolet. There are OTHER space telescopes in orbit that use this benefit to observe x-rays.

Kay Hans Lipphershey invented the telescope because he was a lensmaker. at the time his kids were playing outside when they discovered it, Hans didnt really create it it was his kids but he took the credit from them. people think that Galileo also created it but he did not. he took it a step further from Lipphersheys idea and just made it better. so they should both be credited. he created it also for the scientists and mathematicians in that time could study the planets and solar system. by Liam

Telescopes are often located in deserts because deserts offer very dry and clear atmospheric conditions, which are ideal for observing celestial objects. The dry air minimizes atmospheric distortion, providing astronomers with clearer and more detailed images of the night sky. Additionally, deserts have fewer artificial lights, reducing light pollution that can interfere with astronomical observations.

The original "Hand with reflecting sphere" sculpture by M.C. Escher is located in the Escher Museum in The Hague, Netherlands. The museum is housed in a former royal palace, known as the Lange Voorhout Palace.

Astronomers discovered a large dark storm on Neptune, which they named the Great Dark Spot. This storm was similar in size to Earth and displayed winds up to 1,500 mph. Its presence surprised astronomers because it had not been observed during the Voyager flyby missions in the 1980s.

The Hubble Space Telescope orbits Earth at an altitude of about 547 kilometers (340 miles). The distance from the Sun to Earth varies due to Earth's elliptical orbit, but on average it is about 149.6 million kilometers (93 million miles).

A telescope lens gathers and focuses light from distant objects, producing an image that appears magnified. By bending and converging the light rays, the lens creates a larger image on the retina of the eye, making objects appear closer and more detailed than they actually are.

In space there is no interference by Earth's atmosphere.

In space there is no interference by Earth's atmosphere.

In space there is no interference by Earth's atmosphere.

In space there is no interference by Earth's atmosphere.

The earliest know working telescopes appeared in 1608 by Hans Lippershey.

The Hubble Space Telescope orbits Earth at a speed of about 17,000 miles per hour (27,000 km/h). At this speed, it completes an orbit around Earth approximately every 97 minutes.

Refraction in a microscope helps to bend light rays, allowing the objective lens to focus on a specimen and magnify it. By bending light through the specimen, the microscope can produce a detailed image of small structures that would otherwise be invisible to the naked eye.

The observatory had not yet opened, so we waited outside until it did.

Yes, the invention of the telescope led to further advancements in science and technology, including improvements in optics, astronomy, and the development of other optical instruments. It revolutionized our understanding of the universe and paved the way for discoveries such as the moons of Jupiter and the rings of Saturn.