All telescopes gather radiation from distant objects over a large area and focus on it; so they increase the intensity of the radiation and allow the objects to be magnified.. The optica
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English Toolkit 1 - Technology
Activities
What did Galileo Galilei see when he looked through
his newly invented telescope? He was probably the
first man to see the mountains and craters on the
surface of the Moon, the satellites of Jupiter and the
starry Milky Way
The word telescope is derived from the Greek words
tele, from afar, and skopos, viewer Even a very basic
telescope can clearly show Saturn’s rings, Jupiter’s
bands and red spot, and more
All telescopes gather radiation from distant objects
over a large area and focus on it; so they increase the
intensity of the radiation and allow the objects to be
magnified There are different telescopes for different
purposes
The optical telescope gathers visible light radiation
There are three basic types of optical telescopes:
refractors that use lenses, reflectors that use mirrors
and catadioptrics that use a combination of both
lenses and mirrors
The telescope
There are also orbiting telescopes that are used to observe the ultraviolet (UV), far infra-red and X-ray portions of the electromagnetic spectrum The Hubble Space Telescope has special instruments sensitive to infra-red rays, UV rays and X-rays for the study of structures and systems too far to be seen clearly from Earth
Finally, radio telescopes have helped vast new regions of the universe to become observable on Earth because radio waves penetrate dust and gas that obscure light These are the greatest and most powerful telescopes
The Milky Way is one of the millions of galactic systems in the universe It is formed
by hundreds of thousands of stars One of them is the Sun The Milky Way got its name from its white colour and its shape On good weather conditions, it can be seen as a faint white appearance on the night sky which looks like spilled milk
a What did Galileo Galilei look at with his telescope?
b What is the origin of the word telescope?
c How are objects magnified through a telescope?
d Name three basic types of optical telescopes
e What kind of telescope is used for distant star systems?
f Why are radio telescopes so helpful?
Old Telescope
New Telescope
Hubble Space Telescope
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English Toolkit 1 - Technology
many other inventions during the 17th century
Work in groups and choose one of the following
inventions and write about them Consider these
questions when writing the information.
a Galileo was the first to see the Moon
with his microscope
b You can even watch Jupiter’s red spot
with a simple telescope
c Intensity is increased in telescopes so
that objects can disappear
d Lenses and mirrors are used in one type
of optical telescopes
e Refractors and reflectors gather light
radiation that is visible
f Electromagnetic spectrum portions can
be seen by using a magnetoscope
g The Hubble Space Telescope has special
devices sensitive to different types of rays to study our planet
h Radio telescopes help human beings to
study the vastness of the universe
1 something extremely large; it covers a great area
2 a bigger than real vision of something
3 perceptive and precise
4 authorise; permit
5 collect
a magnification
b gather
c sensitive
d vast
e allow
the tiniest particles
from objects and focus on it.
Who was the inventor? When did he invent it? Where? What
was the invention like? How did it work? Why was it useful?
Why was it a great contribution?
a automatic calculator
b pendulum clock
c steam engine
Inventions: