Astronomy Chapter 6 - 6.3

Which of the following is NOT a detector of radiation from space that astronomers have used?

a refracting telescope

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?

a series of glass plates, with light-sensitive chemicals on them, on which the appearance of the sky was recorded

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

a spectrometer

Which of the following has a longer integration time (can collect light for a longer period of time) than the human eye?

all of the above

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

all of the above

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?

heat your telescope, so its delicate optics are not cold

At the largest and most modern astronomical observatories on Earth today, which of the following regularly happens to the image formed by the telescope?

it is recorded using an electronic detector called a CCD for later analysis

An astronomer who is observing visible light from a glowing cloud of gas in space uses an instrument which contains a grating with thousands of grooves on its surface. What will this instrument allow our astronomer to do?

spread out the light from the cloud into a spectrum