1. The origin of infrared radiation from Jupiter is
   (A) blackbody radiation.
   (B) reflected sunlight.
   (C) synchrotron radiation.
   (D) all of the above
   (E) none of the above

2. The origin of visible light from Jupiter is
   (A) blackbody radiation.
   (B) reflected sunlight.
   (C) synchrotron radiation.
   (D) all of the above
   (E) none of the above

3. The radio radiation from Jupiter is dominated by
   (A) blackbody radiation.
   (B) reflected sunlight.
   (C) synchrotron radiation.
   (D) all of the above
   (E) none of the above

4. Why do radio observations provide the most reliable measurement of Jupiter's rotation period?
   (A) radio emission is associated with magnetic field anchorded deep inside the planet.
   (B) radio emission originates beneath the clouds.
   (C) radio emission is the blackbody emission.
   (D) radio observations are not affected by the Earth's atmosphere.
   (E) optical observations can give similarly reliable measurements.

5. The Cassini division in Saturn's ring
   (A) is the dark annular region between the A ring and the B ring.
   (B) contains ringlets.
   (C) is caused by the orbital resonance with Mimas.
   (D) contains more mass than the G ring.
   (E) all of the above.

6. The Encke division in Saturn's rings does not contain any ringlets because
   (A) it is swept clean by a small moon.
   (B) it is subject to tidal interactions with other moons.
   (C) it has strong magnetic field.
   (D) it has strong gravity.
   (E) it is hot.

7. The sizes of particles in Saturn's rings are measured by
   (A) parallax measured from the Earth.
   (B) samples collected by the Voyager spacecraft.
   (C) scattering of light from background stars at different wavelengths.
   (D) high-resolution images taken by the Hubble Space Telescope.
   (E) all of the above.

8. The Great White Spot on Saturn is caused by a bubble of ammonia that is heated by the summer Sun and rises to a high altitude. It appears about every 30 years, because
   (A) the half life of ammonia is 15 yr.
   (B) the half life of ammonia is 30 yr.
   (C) Saturn's orbital period is 29.5 yr.
   (D) his period is resonant with Jupiter's orbital period.
   (E) it is just the way it is.

9. The three big Jovian ``storms", the Great Red Spot, the Great White Spot, and the Great Dark Spot, are on
   (A) Jupiter, Saturn, and Neptune.
   (B) Jupiter, Saturn, and Uranus.
   (C) Jupiter, Uranus, and Neptune.
   (D) Mars, Jupiter, and Saturn.
   (E) Jupiter, Neptune, and Pluto.

10. How old is Jupiter's Great Red Spot?
    (A) 4.6 billion years
    (B) 1 billion years
    (C) a few million years
    (D) a few thousand years
    (E) at least 300 years

11. Which of the following planet does not have rings?
    (A) Venus
    (B) Jupiter
    (C) Saturn
    (D) Uranus
    (E) Neptune

12. Whose orbit crosses Neptune's orbit?
    (A) Uranus
    (B) Jupiter
    (C) Pluto
    (D) Titon
    (E) Mimas

13. Hubble Space Telescope watched Uranus at ____ wavelengths, so that it can see the clouds low in the atmosphere.
    (A) visible
    (B) infrared
    (C) radio
    (D) X-ray
    (E) gamma ray

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    Last updated October 9, 2001

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