3 and 4 Flashcards
who made the first optical telescope
In 1608, a Dutch optician named Hans Lippershey made one of the first telescopes, but it is Galileo who has been credited with first using the telescope to study the visible features of the night sky.
whats another name for a optical telescope
light collecters
what are optical telescopes
That is what their series of lenses and mirrors do is gather and focus the light from stars so that we can see it.
the larger the area of the lenses and mirror in a telescope the ______
, the greater the ability of the telescope to see the faint light of objects that are very distant.
what was the first telescope ever designed
The first telescope ever designed was a simple refracting telescope.
Refracting telescopes use two lenses to gather, bend and focus starlight.
is there a limit to how large a refracting telescope can be
yes
refracting telescopes use _____ instead of lenses
mirrors
is the mirror in a refracting telescope concave or convex
conave
whats the metal in the concave mirror of a refractiting telescope made from
which is made from glass-like material that is coated with a thin layer of metal.
The metal, such as aluminum, is polished to a shiny finish so that it can reflect the faintest light it receives.
whats a segmented mirror telescope
A segmented-mirror telescope
uses several lightweight segments to build one large mirror.
The result is a large telescope with enormous light-gathering ability and resolving power.
whats resolving power
Resolving power is to produce images that can be distinguished or seen clearly.
where are keck 1 anad 2 located
Mauna Kea in Hawaii
what are keck 1 and 2 made up of
each made up 36 hexagonal mirrors.
how can the resolution of the images seen with optical telescopes can be further
improved
when two or more of the telescopes are used together.
whats the technique of using telescopes in combination known as
interferometry.
when working together what can keck 1 and 2 do
When working together, they can detect objects in space with better
clarity and at greater distances than any other current Earth-based
observatories can.
whats interformery
combining telescopes for greater power
where are telescopes usually placed
Sites at high altitude are ideal for optical astronomy and provide optimal seeing, being above a significant portion of the Earth’s atmosphere with its associated weather, turbulence, and diminished clarity.
what can interfer with stargazing
Clouds, light pollution, air pollution, humidity (moisture in the air), and even high winds can interfere with star-gazing.
where does the hubble space telescope orbit
Orbiting about 600 km above Earth,
what is the hubble space telescope
a relecting telescope
what does the hubble space telescope use to focus light on far away objects
series of mirrors
when was the hubble launched
1990
how long does the orbit of the hubble take around the earth
95m
what other things does the hubble do
Some time also goes to activities
such as turning the telescope to focus on a new object of interest or
switching data transmission modes.
Commands for these tasks are sent
from ground control several times a day.
