Astronomy Quiz 11-12

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Jupiter is noticeably oblate because:

it rotates rapidly

How does the mass of Jupiter compare with that of the other planets?

It is twice as massive as all other planets combined.

How does the density of Jupiter compare to the terrestrial planets?

Its density is less than any terrestrial.

How was the rotation rate of Jupiter's core determined?

by radio observations of Jupiter's rapidly spinning magnetosphere

What is interesting about Jupiter's rotation period?

It is the fastest in the solar system.

Essentially, the Great Red Spot is

a large cyclonic storm (hurricane).

What is the name used to describe the dark bands encircling Jupiter?

belts

The most striking "cloudmark" in Jupiter's atmosphere is the:

Great Red Spot.

What is the probable source of the day-to-day variations in Jupiter's belts and zones?

differential rotation and the underlying zonal flow

The reason the jovian planets lost very little of their original atmosphere is due to their

large mass.

Together which two gases make up 99% of Jupiter's atmosphere?

Hydrogen and Helium

Alternating zones of rising and sinking gas in Jupiter's atmosphere

create light and dark bands.

How does the heat Jupiter radiates compare to the energy it receives from the Sun?

Jupiter radiates back into space about twice the energy it gets from the Sun.

What is the source of Jupiter's excess energy?

the slow escape of gravitational energy released during the planet's formation

What is true of Jupiter's magnetosphere?

It has a tail that extends at least to Saturn's orbit.

How does the magnetic tilt of Jupiter compare with our field?

Both are tilted about 10 degrees, but Jupiter is opposite in polarity.

What is thought to be the cause of Io's volcanos?

tidal stresses from both Jupiter and Europa

Which of the jovian moons is the largest and also the largest moon in the solar system, even bigger than Mercury?

Ganymede

Which of the four Galilean moons is not differentiated?

Callisto

Where is Jupiter's ring located?

above Jupiter's cloud tops and inside the orbit of its inner-most moon

What is the source of Jupiter's intense radio waves and magnetism?

liquid metallic hydrogen swirling in the rapidly spinning mantle

What do our magnetic field and Jupiter's share?

auroral displays in the polar regions

Which of the Galilean moons is the densest and most geologically active?

Io

What spacecraft was intentionally destroyed in 2003 so that it could not hit Europa?

Galileo

If you could find a bathtub big enough for Saturn, the planet would:

float.

Saturn's rings are widest open, doubling the planet's brightness, when it is at:

solstice.

The reason Saturn lost very little of its original atmosphere is due to its

large mass.

Saturn is noticeably oblate because

it is a fluid body that is spinning rapidly.

The atmosphere of Saturn is composed mostly of:

hydrogen and helium.

What is the space probe that is currently oribing Saturn and is responisble for numerous discoveries of storms and weather patterns in Saturn's atmosphere called?

Cassini.

Compared to Jupiter, Saturn's atmosphere is

more calm with fewer disturbances or storms.

Saturn's bands, oval storm systems, and turbulent flow patterns are powered by:

convective motion and rapid rotation.

Why does the atmosphere of Saturn appear to have only half the helium content of Jupiter?

Much of Saturn's helium has differentiated towards its center.

Why does Saturn radiate even more excess energy than Jupiter?

Helium rain gives off heat as it differentiates toward Saturn's center.

What did the Voyager mission discover about the main rings of Saturn?

They are composed of tens of thousands of narrow ringlets.

The reason the rings of Saturn exist is because:

the ring material lies within the Roche limit of Saturn.

The Roche limit is the point at which

the external tidal forces on an object become greater than the internal forces that hold it together.

Shepherd satellites are defined as:

moons that confine a narrow ring.

If satellite A is in a 2:1 resonance with satellite B, this means that

the orbit of satellite B takes twice as long to complete as that of satellite A.

How many large moons does Saturn have?

1

Titan is an interesting moon because:

it has a rich atmosphere that may resemble that of the early Earth.

Why was it thought that Titan may have oceans of methane?

The atmospheric pressure at Titan's surface and its surface temperature are such that methane should be liquid on Titan's surface.

What mission landed on Titan in early 2005?

Huygens

What did the Voyager mission discover about Cassini's Division?

It contains several ringlets.

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