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Exam 6: Astronomical Instruments

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Question 21

Multiple Choice

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You are an astronomer who wants to study a faint star in the process of being born, which gives off most of its faint radiation in the infra-red. Which of the following would NOT be a step you would want to take?

A) heat your telescope, so its delicate optics are not cold
B) try to have your telescope as high above the layers of water vapor in the Earth's atmosphere as possible
C) shield your telescope from the radiation given off by your graduate students
D) isolate your telescope in very cold surroundings
E) make sure your telescope optics are kept as free of dust as possible

F) C) and D)
G) A) and D)

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Question 22

Multiple Choice

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What was the major problem with the Hubble Space Telescope when it was first launched into orbit?

A) its antenna wouldn't open, so the data could not be sent back to Earth
B) it was in the wrong orbit, so it dipped down into the Earth's thicker atmosphere regularly
C) its spectroscope broke during the launch
D) the mirror's shape was slightly wrong, so all the light did not come to a single focus
E) the mirror cover was stuck in the "partly on" position, making part of the mirror not usable

F) C) and D)
G) D) and E)

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Question 23

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The first person who regularly turned a telescope to astronomical observations (and published his observations) was:

In a radio telescope, the role that the mirror plays in visible-light telescopes is played by:

A very wealthy donor decides to give a large sum of money to your college or university to build the world's largest visible-light gathering telescope. From an astronomical perspective, where would be the best location to put such a telescope?

The size of the device that collects radiation (such as light) is called a telescope's:

Our textbook discusses that radio astronomers are building more and more arrays of radio telescopes, where many "dishes" are connected together. What advantage do such arrays have?

Your friend, a graduate student in astronomy, is giving you a special tour of the local observatory. You notice that you are viewing the image from the big telescope from underneath the primary mirror; the beam of light has come through a small hole in the main mirror to an eyepiece below. This telescope uses what focusing arrangement?

Why do telescopes have to have a good motorized drive system to move them quickly and smoothly?

When the James Webb Space Telescope is finally launched, what will be its distinguishing characteristic (what about it will really help astronomers) ?

Which of the following major telescopes was not located in space?

Astronomical observatories have been available since ancient times, and many cultures set aside special sites for astronomical observations. The thing modern observatories have that was missing from these older observatories until about 1610 was:

Why is an image recorded with a CCD better for astronomers than an image recorded on photographic film or plates?

The SOFIA Project is

To break up light into the component colors that it contains, astronomers use a device called:

When an astronomer involved in a research project says he is going to look at the observatory's plate collection, what will he be looking at?

The largest visible-light telescopes in the world use what device to collect as much light as possible before the light is brought to a focus (to act as the "light bucket") ?

A new technique called adaptive optics allows astronomers to:

When astronomers do radar astronomy, they

The Chandra Observatory orbiting the Earth is designed to