Light and Telescopes. A Telescope is a tool used to gather light from objects in the universe. There are two different types of telescopes. A refracting telescope uses a glass lens to concentrate incoming light A reflecting telescope uses mirrors to concentrate incoming starlight.
and least important,
magnification = (objective lens focal length / eyepiece lens focal length)
A larger objective (lens or mirror) provides a brighter ( the universenot bigger) image
ROY G B I V
Astronomers are interested in the entire spectrum of Light!
Map of Orion region
Hubble Space Telescope Views of Orion Nebula showing stars hidden in clouds
Sun as seen in visible light from Earth and from space in X-rays by satellites
‘Twinkle, twinkle, little star’ X-rays by satellites
Atmospheric seeing X-rays by satellites
How can we improve the image quality? X-rays by satellites
Bigger telescope mirror
Location, location location! (mountain tops, space)
The planet Uranus imaged in the infrared X-rays by satellites
Same picture taken with Hubble Space Telescope high above Earth’s blurring atmosphereEarth’s atmosphere refracts light: images are blurry!
Which is the correct reasoning for why a gamma ray telescope located in Antarctica that is to be used to look for evidence of black holes in the centers of galaxies would not get funded?
Imagine you’re the head of a funding agency that can afford to build only one telescope. Which of the three proposed telescopes below would be best to support?
Imagine that you throw a ball directly upward. Which of the following statements best describes how Newton’s second law accounts for the motion of the ball when it reaches its maximum height?