Telescopes

A Cassegrain telescope is designed with mirrors along the inside of its body tube. Light enters the tube and first reflects off a concave primary mirror at the back of the tube, then reflects off a smaller convex secondary mirror before exiting the tube. This design allows for a more compact telescope with a long focal length.

Astronomers have several reasons to send telescopes into space, including:

* The atmosphere makes stars look blurry. the simple answer is the atmosphere. The layers of air in the atmosphere may seem clear but contribute to a fuzzy picture in space. To avoid this they send telescopes into space where nothing is in between the telescope and the observed object.

One reason for sending telescopes into space is so that people can get a better look at the stars the second reason for this is so that scientist can discover more about stars.

* The atmosphere completely blocks some kinds of light -- in particular, ultraviolet and far-infrared light. On earth, spectrometers using this kind of light tell us a lot about local materials. To get the same information about stars and planets, we need to put the spectrometer outside the veil of the atmosphere.

People who are not astronomers have other reasons to send telescopes into space, including

* Telescopes on "weather satellites" and "spy satellites" pointed at earth can get photos and accurate maps of places and weather that are extremely difficult to get in any other way.

Galileo used to telescope to map out the stars. To be honest, the telescope was very important because he noticed that Jupiter actually had moons... this got Galileo into trouble because it proved that the earth wasn't the center of the universe (went against the church)...... he studied the crescents on Venus and such. It provided him a scientific tool to go beyond the normal humans eye sight. If you want to know more im sure wiki has plenty of pages on Galilo. :)

*sources

None this time... did this from my memory. :)

The reflecting telescope, invented by Sir Isaac Newton, allowed for sharper and brighter images of celestial objects compared to the refracting telescope. This telescope played a crucial role in advancements in astronomy and led to discoveries such as the rings of Saturn, the moons of Jupiter, and the spiral structure of galaxies.

refracting telescopes use lenses instead of mirrors.

1. chromatic aberration: when light passes through a lens it is focused at different points. Blue focuses closer to lens and red farther creating a smeared image.

2. Some light is absorbed by lenses.

3. Lenses are heavy and can only be supported by the edge.

4. Lenses must have to optically acceptable surfaces whereas a mirror only needs one.

The James Webb Space Telescope will be located approximately 1.5 million kilometers (about 932,000 miles) away from Earth at the second Lagrange point (L2), which is a stable gravitational point in space.

A telescope gathers light from objects in space, allowing astronomers to observe and study the objects in detail. This collected light is then magnified and analyzed to provide information on the object's characteristics such as size, composition, distance, and movement.

Telescopes are used by astronomers to collect light from celestial objects such as stars, planets, and galaxies. They enable astronomers to study these objects in detail, revealing information about their properties, composition, and motion. Telescopes can also help astronomers in detecting and studying phenomena like supernovae, black holes, and exoplanets.

Space boots are necessary in space to protect astronauts from extreme temperature changes, provide traction in microgravity environments, and shield them from sharp objects or debris that could pose a hazard. They also help regulate blood flow and reduce the risk of injury during spacewalks and other extravehicular activities.

Some names of unmanned missions include Voyager, Curiosity, Juno, and Hubble. These missions have explored distant planets, comets, asteroids, and galaxies, providing valuable information about the universe.

The magnification. What really matters about a telescope, the single most important piece of information, is the diameter of the main lens, or main mirror.

The magnification. What really matters about a telescope, the single most important piece of information, is the diameter of the main lens, or main mirror.

The magnification. What really matters about a telescope, the single most important piece of information, is the diameter of the main lens, or main mirror.

The magnification. What really matters about a telescope, the single most important piece of information, is the diameter of the main lens, or main mirror.

The largest visible light telescopes are now all ground-based, such as the Keck Observatory in Hawaii or the Very Large Telescope in Chile. These telescopes provide high-resolution images and data of celestial objects in visible light.

It refracts (bends) light into a focal point

The Pole Star appears stationary in the night sky because it lies almost directly above the Earth's North Pole. As the Earth rotates on its axis, the North Pole always points in the same direction towards the Pole Star. This makes the Pole Star visible every night, regardless of the Earth's revolution around the Sun.

Radio telescopes are used by astronomers to study celestial objects and phenomena in the radio frequency range. They are employed to detect radio waves emitted by objects such as stars, galaxies, and cosmic microwave background radiation. Radio telescopes are also used in radio astronomy research to investigate the structure and composition of the universe.

A reflecting telescope only needs one mirror, the primary mirror which will focus incoming light to a single point.

A digital telescope might place the digital recording media directly in front of the reflecting telescope without any additional mirrors (although perhaps some lenses).

For practical purposes though, most optical telescope will have a secondary mirror that will either focus light straight back through a hole in the primary telescope mirror, or to the side of the telescope.

Some telescopes, especially the large ones in observatories will have several mirrors directing the light path to the observer or recording equipment.

The light-gathering power of an objective lens or mirror is proportional to its area, or equivalently,
to the square of its linear dimensions (radius, diameter, circumference).

If the focal ratios ('f' number) are the same, then the 1-m scope scoops up 102 = 100 times as much light
as the 10-cm job.

100 times difference in brightness is exactly the mathematical definition of six (6) magnitudes brighter/dimmer.

It sounds like you have a passion for astronomy, which can be a fulfilling hobby or even a potential career path. Studying the night sky with telescopes allows for exploring the vast universe beyond our planet and can lead to discovering new celestial objects and phenomena. Consider joining an astronomy club or pursuing formal education in astronomy to further enhance your interest and knowledge in this field.

Technically, you can see every planet right up to Pluto (Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune). The last two are of course much tougher to find, since they aren't visible to the naked eye. The other 5 planets can be seen with the eye, so you will obviously be able to see them magnified slightly. If you bought a decently cheap telescope, you SHOULD be able to see Jupiter's Satellite system (the Gallilean moons) and Saturn's rings. Mars is pretty boring in tiny telescopes, and Venus displays some detail.

The Space Shuttle Endeavour was used to repair the Hubble Space Telescope in 1993 during the STS-61 mission. The crew installed corrective optics to fix the telescope's flawed vision.

Galileo Galilei is credited with being the first to use a telescope to study the heavens systematically in the early 17th century. His observations of celestial bodies through the telescope led to significant discoveries in astronomy.

The small telescope on top of a larger telescope is called a guide scope or finder scope. It is used to help the astronomer point the main telescope at specific objects in the sky by providing a wider field of view for initial alignment. The guide scope is usually equipped with a crosshair reticle for precise targeting.

The telescope was invented to allow astronomers to view distant objects in space more clearly. It revolutionized the field of astronomy by enabling scientists to observe celestial bodies such as stars, planets, and galaxies in more detail, leading to numerous discoveries and advancements in our understanding of the universe.

The use of a two lens telescope is credited to three people of Netherlands , Hans Lippershey and Zacharias Janssen, and Jacob Metius . Galileo improved on their designs and is generally given the credit of inventing the telescope.
Robert Hooke was the first to use a two lens microscope.