Astronomy Chapter 6 Review

How does your eye focus light? What do we mean by the focal plane of a lense?

The pupil controls how much light enters your eye; it dilates in low light and constricts in bright lights. a focal plane is the place where the image appears in focus. with perfect vision the focal place is right on the retina.

how does a camera record light? how are images affected by exposure time? what are pixels?

the light comes through a small opening at the front and then the lense bends the light bringing it to a focus on a detector thats makes a permanent record of the image.
exposure is controlled by the shitter of a camera. light reaches the detector only wh

two key properties of a telescope and why is it important?

A telescopes light-collecting area tells us how much total light it can collect at one time. for example a "10-meter telescope" has a light collecting area that is 10 meters in diameter.
Angular resolution is the smallest angle over which we can tell that

what is the Diffraction limit, and how does it depend on a telescope's size and the wavelength of light being observed?

The angular resolution that a telescope could achieve if it were limited only by the interference of light waves is called its diffraction limit. for any particular wavelength of light a larger telescope has a smaller diffraction limit, meaning it can ach

how do reflecting telescopes differ from refracting telescopes? which type is more commonly used by professional astronomers and why?

a refracting telescope operates much like an eye, using a transparent glass lense to collect and focus light. A reflecting telescope uses a precise curved primary mirror to gather light. then reflects to a secondary mirror which reflects it to where the e

what are the three basic categories of astronomical observation, and how is each conducted?

Imaging which yields photographs or images of astronomical objects. Spectroscopy, in which astronomers obtain and study spectras. and Time Monitoring which tracks how an object changes with time.

what do we mean when we talk about images made from invisible light, such as x-ray or infrared images? what do the colors in these images mean?

invisible light is light that the human eye cannot see but can be captured by specialized detectors. images made with invisible light cannot have any natural color, because "color" is a property only in visible light. however, we can use color coding to s

what do we mean by spectral resolution? Why is it higher spectral resolution more difficult to achieve?

spectral resolution goes hand in hand with how much detail we can see. the higher the spectral resolution the more detail we can see. higher spectral resolution comes with a price, it depends on how widely the spectrograph spreads out this light that it c

List three ways in which Earth's atmosphere can hinder astronomical observations. What problem can adaptive optics help with?

Light Pollution is from the city lights at night and hinders the astronomers view of the night sky.
Twinkling and Atmospheric Turbulence is what we call it when the air currents are continually moving and mixing around constantly changing the atmosphere's

describe how deeply each portion of the electromagnetic spectrum penetrates Earth's atmosphere. Based on your answer, why are space telescopes so important to our understand of the universe?

only radio waves, visible light, and small parts of the infrared spectrum can be observed from the ground. Therefore the most important reason for putting telescopes into space is to allow up to observe the rest of the electromagnetic spectrum.

how do telescopes for invisible wavelengths differ from those for visible light? answer for each major wavelength band and give examples of important observatories in those bands.

telescopes for invisible wavelengths require variations on the basic design used for visible-light telescopes.
Radio Telescopes do not need angular resolution to decode the waves themselves. all radio waves can be observed from the ground and do not need

what is interferometry and how can it improve astronomical observation?

Interferometry is the linking of two or more telescopes together to achieve the angular resolution of a much larger telescope. it works by taking advantage of the wavelike properties of light that cause interference. The procedure relies on precisely timi