AY 101-002                                                       Spring 2008
                                   QUIZ #4

Answer each of the following on a computer-gradeable answer sheet. Be
sure to fill in your name and student number (and blacken their circles as 
well). Write your seat number on a corner of the answer sheet.

1. The Earth's atmosphere limits astronomy
   a) by absorbing most kinds of radiation.
   b) by blurring radiation passing through it.
   c) by reflecting artificial light in the air for large distances.
   D) IN ALL OF THE ABOVE WAYS.

2. A major drawback to refracting telescopes is caused by
   a) their long tubes compared to reflectors.
   B) SINGLE LENSES FOCUSSING LIGHT OF DIFFERENT WAVELENGTHS AT DIFFERENT POINTS.
   c) their inability to track the sky as the Earth rotates.
   d) their small fields of view.

3. Which of the following can only function beyond the Earth's atmosphere?
   a) radio telescopes.               C) X-RAY TELESCOPES.
   b) neutrino detectors.             d) spectrographs.

4. Pluto's reclassification as a "dwarf planet" was brought about when
   a) it was discovered to be much less massive than Mars.
   B) MORE SIMILAR OBJECTS IN SIMILAR ORBITS WERE FOUND.
   c) no similar planets were found around other stars.
   d) its orbit was recalculated.

5. Cold dust particles in deep space are best seen using
   a) radio telescopes.                c) ultraviolet telescopes.
   B) INFRARED TELESCOPES.             d) X-ray telescopes.

6. The drive to build ever-larger telescope mirrors for astronomers is
   largely driven by the fact that large telescopes
   a) can view a larger area of sky at once.
   B) GATHER MORE LIGHT, ALLOWING DETECTION OR MEASUREMENTS OF FAINTER OBJECTS.
   c) can provide higher magnifications.
   d) sample a larger wavelength range in the electromagnetic spectrum.

7. Many planets have been found around other stars, most of them by
   a) the miniscule dimming of the stars as planets pass in front of them.
   b) Hubble images showing the faint, moving planets.
   C) CHANGES IN THE STARS' DOPPLER SHIFTS AS THEIR PLANETS ORBIT. 
   d) radio waves from their intense radiation belts.

8. Many of the planets known around other stars are
   a) rocky, Earthlike planets at low temperatures.
   b) massive Jupiter-like planets orbiting far from the stars.
   C) MASSIVE JUPITER-LIKE PLANETS ORBITING VERY CLOSE TO THE STARS.
   d) orbiting far from the stars' equatorial planes.

9. The planets closest to the Sun have the largest proportion of
   A) METALLIC ELEMENTS.              c) ices.
   b) rocky material.                 d) hydrogen and helium.

10. Available data indicate that the planets formed
   a) when another star nearly collided with the young Sun.
   B) FROM AN ORBITING DISK OF GAS AND DUST AROUND THE YOUNG SUN.
   c) from material ejected from its atmosphere as the Sun heated up.
   d) independently of the Sun, being captured later by its gravity.