Astronomy 1304: Jupiter, Saturn, Uranus, Neptune, and Small Bodies

Comprehensive fill-in-the-blank practice questions based on the Chapter 11-15 lecture notes covering Jupiter, Saturn, Uranus, Neptune, asteroids, comets, Pluto, and exoplanets.

What is the rotation period of Jupiter?

9 hours and 55 minutes -very fast

What is the orbital period of Jupiter?

11.86 Earth years

How many times the mass of Earth is Jupiter?

318 times

What is a gas giant planet?

A planet with 99% hydrogen and helium, no solid surface, and a thick atmosphere

What are the main components of Jupiter's atmosphere?

Thin, 86% hydrogen and 13.8% helium

What causes the colors in Jupiter's cloud layers?

Complex photochemistry involving sulfur, carbon, phosphorus, and heavy elements

What is the Great Red Spot on Jupiter?

A hurricane twice the size of Earth that has been ongoing for hundreds of years, counterclockwise

What is the structure of Jupiter's interior?

Solid core, liquid metallic hydrogen, and liquid molecular hydrogen

How does Jupiter's magnetic field originate?

From liquid metallic hydrogen that is highly conductive and rapidly rotating

What are the Galilean moons of Jupiter?

Io, Europa, Ganymede, and Callisto

What is unique about Io?

It is the most volcanically active body in the Solar System

What is Europa known for?

Its surface is covered by water ice, and has liquid salt water below, with the same magnetic properties as Io

What is Ganymede's significance?

It is larger than Mercury,geologically active, and has a magnetic field, salty water under surface of ice and rock

What characterizes Callisto?

It has a very old cratered, inactive surface and is mostly rock and water ice

What is tidal heating?

The process where an elliptical orbit causes a moon to be squished and stretched, generating heat from friction

What is the resonance ratio between Europa, Io, and Ganymede?

1:2:4:8

How many orbits does Io have for every orbit of Europa?

1 orbit of Europa has 2 orbits of Io.

How many orbits does Io have for every orbit of Ganymede?

4 orbits of Ganymede have 1 orbit of Io.

What is the plasma torus?

A result of ejected material from volcanoes swept into Io's magnetic field.

What effect does Jupiter's tidal force have on Io?

It causes Io to have an eccentric orbit close to Jupiter. stronger closer, weaker farther

What is the composition of Jupiter's magnetic field?

A flat sheet of charged particles squished into the equatorial plane.

What are the bands of clouds in Jupiter's atmosphere characterized by?

Bright zones and dark belts due to convection.

What is the thickness of Jupiter's atmosphere?

200 km thick.

How does temperature change with altitude on Jupiter?

Temperature rises with altitude because it absorbs UV radiation.

What is unique about Europa's orbit around Jupiter?

very low eccentricity and a nearly circular orbit.

How does Jupiter's mass compare to all other planets combined?

twice that of all planets combined.

What is the orientation of Jupiter's rotation axis?

Perpendicular to its orbital plane.

Does Jupiter have rings?

Yes, but they are very faint

What caused the impact on Jupiter's atmosphere?

Comets, including Shoemaker, were broken into tiny pieces by tidal forces and hit Jupiter's upper atmosphere.

What is Saturn known as in the Solar System?

The 2nd gas giant.

How long does it take Saturn to complete one orbit around the Sun?

30 years (29.4 years).

What is the rotation period of Saturn?

10 hours.

What is the composition of Saturn's atmosphere?

92% hydrogen, 7.4% helium, ammonia, and methane.

What is unique about Saturn's density?

It is the least dense planet in the Solar System.

Who first observed Saturn's rings?

Galileo.

What is the Cassini Division?

Gaps between the rings of Saturn.

What is the Roche limit in relation to Saturn's rings?

Rings do not form outside the Roche limit.

What is the largest moon of Saturn?

Titan.

What is Titan's atmosphere primarily composed of?

98% nitrogen and 2% methane.

How does Titan's atmosphere compare to Earth's?

It is 50% denser than Earth's atmosphere.

What geological activity is observed on Enceladus?

Cold icy geysers with water ice and CO2.

What drives the geologic activity on Enceladus?

Tidal heating.

What is the internal structure of Saturn?

Icy rock core, inner metallic hydrogen, outer molecular hydrogen.

What is Saturn's magnetosphere strength compared to Jupiter's?

1/20 of Jupiter's strength.

What is the primary reason Titan can retain a dense atmosphere?

Low surface temperature affects gas molecule velocity.

What happens to helium in Saturn's atmosphere?

Helium precipitates and condenses around liquid hydrogen.

What is the mass of Saturn compared to Earth?

100 times the mass of Earth.

What is Saturn's radius?

60 miles.

What is the size rank of Titan among moons in the solar system?

Titan is the 2nd largest moon in the solar system.

What is Titan's core composition?

Titan has a rocky core surrounded by a large icy mantle.

What evidence suggests the presence of methane lakes on Titan?

There is evidence of methane lakes and oceans of methane and ethane. Methane rain

What are Saturn rings composed of?

Saturn rings are made up of small individual particles, primarily water ice and dust.

How did Saturn rings form?

Saturn rings formed within the Roche limit when a moon wandered in and tidal forces broke it into tiny particles.

What is the structure of Saturn atmosphere?

Saturn atmosphere is thick and fluffy due to its low density.

What is the significance of Cassini's measurements of Saturn rings?

Cassini measured the dark eyes of the particles and their exposure to radiation and solar rays.

What defines an ice giant planet?

An ice giant planet is primarily composed of elements heavier than hydrogen and helium, such as water, ammonia, and methane, with about 80% of its mass being ice.

What is the interior structure of Uranus and Neptune?

Both have rocky cores and massive ice mantles, with Uranus having more molecular hydrogen and Neptune having more ice. Neptune has a more massive rock core and a thinner mantle.

What is the mass of Neptune compared to Earth?

Neptune has a mass of about 17 times that of Earth.

What is the mass of Uranus compared to Earth?

Uranus has a mass of about 14 times that of Earth.

What is the axial tilt of Uranus?

Uranus has an extreme axial tilt of 98 degrees, possibly due to a major collision during its formation.

How does Uranus's tilt affect its seasons?

Due to its tilt, one pole can face the Sun for 42 years, leading to extreme seasonal variations.

How are the magnetic fields of Uranus and Neptune generated?

Ammonia-Generated by electric currents from warm, pressurized liquid layers that dissolve ammonia, leading to ionization in a conducting ionic layer.

What is unique about Triton, Neptune's moon?

Triton is a large moon with a retrograde orbit, geologically active with a thin icy nitrogen atmosphere and cryogeysers due to tidal heating.

What is the orbital period of Triton around Neptune?

Triton orbits Neptune in about 5.9 days.

What happens to Triton's orbit over time?

Triton's orbit is gradually decaying, and it will eventually break apart to form particle rings around Neptune.

What is the composition of the atmosphere of Uranus and Neptune?

their atmospheres are primarily composed of hydrogen, helium, and methane gas.

How does the pressure inside Uranus and Neptune affect ammonia?

Under pressure, ammonia can dissolve in liquid water layers within the planets.

What is the relationship between Triton and the Kuiper Belt?

Triton is believed to be a captured Kuiper Belt object, originally an ice protoplanet that was captured by Neptune's gravity.

What type of geological activity is observed on Triton?

cryogeysers, which are geysers that erupt with cold nitrogen due to internal heating from tidal interactions.

What is the difference in the mantle composition between Uranus and Neptune?

Uranus has a thicker mantle of molecular hydrogen, while Neptune has a more massive ice mantle.

What is the effect of Triton's retrograde orbit?

causes tidal bulges that slow it down and decrease its orbital radius over time.

What is the primary reason for the blue color of Uranus and Neptune?

methane in the atmosphere, which absorbs red light and reflects back the blue light

How does the mass of Neptune compare to Uranus?

Neptune is more massive than Uranus, with a greater rock core and ice content.

What is an asteroid?

A small, rocky, or metallic body that orbits the Sun, primarily located in the main asteroid belt between Mars and Jupiter.

Where are most asteroids located?

In the Main Asteroid Belt between Mars and Jupiter.

What are the Kirkwood Gaps? .

Specific, narrow zones within the main asteroid belt where few or no asteroids are found due to specific orbital distances

What is the most common type of asteroid?

C-type asteroids, which are carbon-rich and make up 75% of asteroids.

What type of material do S-type asteroids consist of?

Silicate or rocky material, making up 15% of asteroids.

What materials are M-type asteroids composed of?

Nickel and iron, making up 10% of asteroids.

What do carbonaceous asteroids represent?

Primitive material representative of the earliest stages of the solar system.

What is the impact hazard of Near Earth Asteroids?

They can get close to Earth, and if their orbits change slightly, they could potentially hit Earth.

What percentage of Near Earth Asteroids land on water?

Two-thirds of them.

What happens during small frequency impacts of Near Earth Asteroids?

They explode in the atmosphere, causing major shockwaves that can flatten trees and landscapes.

What is the K-T event?

A major extinction event believed to be caused by an asteroid impact. -dino

What was the primary reason for the search for Planet X?

Irregularities in Uranus's motion suggested the influence of an unknown body beyond Neptune.

Who initiated the search for Planet X?

Percival Lowell

What is Pluto's orbital inclination?

17.2 degrees

What is the eccentricity of Pluto's orbit?

0.25

How long is Pluto's orbital period?

248 years

What is Pluto's rotation period?

6.5 days

What is the orbital resonance between Neptune and Pluto?

3:2 resonance (3 Neptune orbits for every 2 Pluto orbits)

What are the main components of Pluto's atmosphere?

Nitrogen, carbon monoxide, and trace methane

What is the surface composition of Pluto?

Icy surface with nitrogen ice, rock core, and frozen nitrogen

What is the significance of Charon in relation to Pluto?

Pluto and Charon are tidally locked and Charon formed from a collision.

What classifies a planet?

1. Orbits the Sun 2. Is massive enough that the own gravity makes it approximately spherical 3. Has "cleared the neighborhood" around its orbit of similar objects

What demoted Pluto to a dwarf planet? .

#3Has not cleared its orbital neighborhood

What is the Kuiper Belt?

A region of the Solar System located beyond Neptune, containing many icy bodies.

How many objects are estimated to be in the Kuiper Belt?

Over 100,000 members

What is the significance of the year 1992 in relation to the Kuiper Belt?

It marks the discovery of the first other objects in the Kuiper Belt.

What is the relationship between Pluto and the Kuiper Belt?

Pluto is one of the largest Kuiper Belt Objects (KBOs) and orbits near its inner edge.