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Science 11.1

Science review from section 11.1

What is an astronomer's most important tool? A telescope
What does a refracting telescope do? Use lenses to gather light and form an image
What does a reflecting telescope do? Use mirrors and lenses to produce an image
What is an objective lens? A large lens that collects light, and brings it to a focus between the two lenses.
What is an eyepiece? A small lens That enlarges an inverted image.
Who built the first reflecting telescope? Isaac Newton
What telescopes do astronomers prefer? Reflecting telescope
What is the large curving mirror used in place of an objective lens called? A primary or objective mirror
What is the difference in the way reflecting and refracting telescopes take in different colors of light? Refracting telescopes refract or bend light, but reflecting telescopes reflect all colors at the same angle, producing a sharper picture.
What is the small flat mirror that reflects the picture into an eye piece? A secondary mirror
Why do astronomers prefer the reflecting telescope? Because the mirrors can be made huger and cheaper, producing brighter images with better resolution (Detail and clearness).
What are telescopes built to Newton's design called? Newtonian telescopes
What is the first obstacle to overcome when viewing the heavens and how is it solved? The first hindrance is the faintness of distant object's light. This may be overcome by bigger lenses or digital cameras used instead of eyes.
What is the other obstacle in viewing the sky?How is it solved? Atmospheric distortion is the other problem it may be solved by adaptive optics (computer control mirrors that constantly change to account for wind and disturbances), or setting a telescope on a high mountain.
What was launched by NASA and the ESA in 1990? The Hubble Space Telescope
What colors do light separate into when shone through a prism and what is this sequence called? Red, orange, yellow, green, blue, violet, these make up the visible spectrum.
What are absorption lines and what causes them? Absorption lines are narrow dark lines in the spectrum caused when gas absorbs some light that is then passed through a prism.
What are spectroscopes and spectrograms? A spectroscope is a device that splits light for analysis. An image that records the spectrum produced by a spectroscope is a spectrogram.
What things can scientists determine using spectrums, absorption lines and sunlight or starlight? atmospheric conditions, surface temperatures of the sun and stars how fast a star moves and even to study the atmospheres of distant planets and their moons.
What do radio telescopes study? Radio waves
Who first discovered radio astronomy in the 1930's? Karl Jansky
What technique, using many radio telescopes very far away, can produce detailed maps of space? Interferometry
Created by: MarciM31601