ASTR Ch.6

A. It is the lower surface of the telescope's primary lens or mirror. B. It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope C. It is the surface of the lens on the eyepiece, through which you would look to see objects in the telescope's field of view. D. It is the upper surface of the telescope's primary lens or mirror. -It is the place where, if we mounted film or an electronic detector, we could get a clear (not blurry) image of an object viewed through the telescope

A. lens B. retina C. pupil D. optic nerve -retina

A. The angular size of the smallest features that the telescope can see B. The number of electromagnetic waves captured by an image. C. The size of an image. D. The brightness of an image. -The angular size of the smallest features that the telescope can see (Therefore a smaller angular resolution is better)

A. about 1 arcminute, or 1/60 of a degree B. about 1 degree C. about 1 milliarcsecond D. about 1 arcsecond (1/3600 of a degree) -about 1 arcminute, or 1/60 of a degree

A. Telescopes have much more magnification and better angular resolution. B. Telescopes can collect far more light with far better angular resolution. C. Telescopes can collect far more light with far greater magnification. D. Telescopes collect more light and are unaffected by twinkling -Telescopes can collect far more light with far better angular resolution.

A. Telescopes have much more magnification and better angular resolution. B. Telescopes can collect far more light with far better angular resolution. C. Telescopes can collect far more light with far greater magnification. D. Telescopes collect more light and are unaffected by twinkling -A refracting telescope uses a transparent glass lens to focus light while a reflecting telescope uses a mirror to focus light.

A. It describes the maximum exposure time for images captured with the telescope. B. It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images. C. It is the maximum size to which any telescope can be built. D. It describes the farthest distance to which the telescope can see. -It is the angular resolution the telescope could achieve if nothing besides the size of its light-collecting area affected the quality of its images.

A. Spectroscopy to spread an object's light into a spectrum. B. Filtering to look at just a single color from an object. C. Imaging to get a picture of an astronomical objects. D. Time monitoring to track how an object's brightness varies with time. -Filtering to look at just a single color from an object.

A. High spectral resolution. B. High turbulence. C. A radio telescope. D. High angular resolution. -High spectral resolution.

A. They show us light with extremely long wavelengths compared to the wavelengths of visible light. B. They always are made with adaptive optics. C. They are always very pretty. D. They are always shown with colors that are not the true colors of the objects that were photographed. E. They always have very high angular resolution. -They are always shown with colors that are not the true colors of the objects that were photographed.

A. Light pollution is a term used to describe the appearance of the sky in regions that are crowded with stars. B. Light pollution is light from human sources that makes it difficult to see the stars at night. C. Light pollution means contamination of light caused by chemicals in the Earth's atmosphere. D. Light pollution is a type of air pollution created by lightweight gases such as hydrogen and helium. -Light pollution is light from human sources that makes it difficult to see the stars at night.

A. diffraction of light B. magnification of images C. twinkling of stars D. light pollution -twinkling of stars (Therefore, there is no twinkling if you view stars from space, above Earth's atmosphere)

A. It reduces blurring caused by atmospheric turbulence for telescopes on the ground. B. It allows ground-based telescopes to observe ultraviolet light that normally does not penetrate the atmosphere. C. It allows several small telescopes to work together like a single larger telescope. D. It is a special technology that allows the Hubble Space Telescope to adapt to study many different types of astronomical objects. -It reduces blurring caused by atmospheric turbulence for telescopes on the ground.

A. infrared, visible, and ultraviolet light. B. radio, visible, and very limited portions of the infrared and ultraviolet regions C. all light with wavelengths longer than ultraviolet wavelengths D. all light with wavelengths shorter than infrared wavelengths -radio, visible, and very limited portions of the infrared and ultraviolet regions (Other parts of the electromagnetic spectrum require telescopes in space)

A. It reduces the twinkling of stars caused by atmospheric turbulence. B. It allows two or more small telescopes to achieve the angular resolution of a much larger telescope. C. It allows two or more small telescopes to achieve a larger light-collecting area than they would have independently. D. It is designed to prevent light pollution from interfering with astronomical observations. -It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.

A telescopic technique in which two or more telescopes are used in tandem to produce much better angular resolution than the telescopes could achieve individually.

The place where an image created by a lens or mirror is in focus.

An instrument used to record spectra

The rate at which peaks of a wave pass by a point, measured in units of 1/s, often called cycles per second or hertz.

The area of the primary mirror or lens that collects light in a telescope

A type of electronic light detector that has largely replaced photographic film in astronomical research.

The process of obtaining pictures of astronomical objects.

The large, light-collecting mirror of a reflecting telescope

An individual "picture element" on a CCD

The degree of detail that can be seen in a ; the hight the spectral resolution, the more detail we can see

The angular resolution that a telescope could achieve if it were limited only by the interference of light waves; it is smaller (i.e., better angular resolution) for larger telescopes.

A small mirror in a reflecting telescope, used to reflect light gathered by the primary mirror toward an eyepiece or instrument.

A technique in which telescope mirrors flex rapidly to compensate for the bending of starlight caused by atmospheric turbulence.

The smallest angular separation that two pointlike objects can have and still be seen as distinct points of light (rather than as a single point of light).

A telescope that uses mirrors to focus light

Rapid and random motion

Reflections in which light grazes a mirror surface and is deflected at a small angle; commonly used to focus high-energy ultraviolet light and X rays.

A graph of an object's intensity agains time

Human-made light that hinders astronomical observations

A picture of an object made by focusing light

The first point at which light focuses after bouncing off the primary mirror; located in front of the primary mirror.

A telescope that uses lenses to focus light

Light that is reflected into random directions

The ability of a lens, mirror, or telescope to obtain clear and properly focused images.

A material that transmits only particular wavelengths of light

Light with wavelengths that fall in the portion of the electromagnetic spectrum between radio waves and visible light

The process of tracking how the light intensity from an astronomical object varies with time.

The amount of time during which light is collected to make a single image