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the planets
planets and characteristics
99
Astronomy
Undergraduate 2
04/18/2012

Additional Astronomy Flashcards

 


 

Cards

Term
Venus and special characteristics
Definition
Backwards rotation, day longer than year, thick CO2 atmosphere, greenhouse effect, hottest planet
Term
Spacecraft to visit Venus? Which orbited and which landed?
Definition

Lenara - landed

Magellan - orbited 

Term

What technique has been used to map the surface of Venus?

Definition
Radar
Term
How does the number of craters on Venus compare to other planets? 
Definition
Relatively few
Term
How old is the surface of Venus? What controls the age of the surface?
Definition
Young surface, 1/2 billion years
Term
What is the atmosphere of Venus made of? How does it differ from Earth’s? 
Definition
CO2, hotter
Term
What is the nature of the canals on Mars? Who built an observatory in Arizona to study them? 
Definition
boundaries by light and dark areas, don't exist. Percival Lowell
Term
How many moons does Mars have? Names and origin? 
Definition
2, Povos and Demos, from asteroid belt
Term
Has Mars undergone plate tectonics? 
Definition
No
Term
How do the northern and southern hemispheres of Mars compare? 
Definition
South has more craters, older
Term
What are the Tharsis Bulge, Hellas Basin, Valles Marineris, and Olympus Mons? How were they created? 
Definition
Tharsis - magma pushing up under crust, Hellas - huge impact, Valles - fault, Olympus - largest volcano in solar system
Term
What is the atmosphere of Mars like? Thick or thin? Dominant constituent? 
Definition
CO2, thin
Term
In what forms can water exist on the surface of Mars? 
Definition
Gas and solid
Term
What are the various pieces of evidence for water on Mars? 
Definition
Lenof channels, dry river beds, ejector blankets of impact craters, permafrost below surface of mars, polar ice caps
Term
Which Mars probe found water ice beneath the surface? 
Definition
Mars Phoenix
Term
What 3 types of probes have visited Mars? 
Definition
Orbiters, landers, rovers
Term
What are the names and notable characteristics of the major probes? 
Definition
Spirit and Opportunity and Pathfinder - rovers, Phoenix - lander, Viking 1 & 2 - orbiter and lander
Term

What are the basic properties of Jupiter, such as mass, composition, and distance from Sun? 

Definition
LARGEST PLANET, LARGEST MASS, ROTATES FAST, GREAT RED SPOT
Term

Which spacecraft have visited Jupiter? Which one included a probe that was dropped into its atmosphere? 

Definition
PIONEER 10&11, VOYAGER 1&2, ORBITED-GALILEO –DROPPED PROBE INTO ATMOSPHERE
Term

What is the Great Red Spot? How long has it existed? Why so long? 

Definition
FEW HUNDRED YEARS, SURVIVE BC JUPITER DOESN’T HAVE CONTINENTS
Term
Why does Jupiter experience such high winds? 
Definition
BC OF FAST ROTATION
Term
Which comet collided with Jupiter in 1994? 
Definition
SHOEMAKER LEVY 9
Term

What are the names and properties of Jupiter’s 4 largest moons? 

Definition
IO-VOLCANOS, EUROPA-LIQUID OCEAN, GANYMEDE-LARGEST MOON IN SOLAR SYSTEM, CALISTO
Term

Which spacecraft have visited Saturn? Which one included a probe that landed on Titan?

Definition
 PIONEER, VOYAGER, CUSINI-ORBITTING-TOOK ALONG LANDER THAT DROPPED ON TITAN
Term

Who discovered the rings of Saturn? A gap in the rings? Who first proposed that the rings are made of particles? 

Definition
GALILEO, CUSINI, MAXWELL
Term

Why does the orientation of Saturn’s rings change over time when seen from Earth? 

Definition
BC OF OUR CHANGING POINT OF VIEW DURING ORBIT OF SATURN
Term

 What are Saturn’s rings made of? Their thickness? 

Definition
CHUNKS OF ICE, 100 M
Term
What are shepherd moons?
Definition
 LITTLE MOONS THAT KEEP RINGS CONFINED
Term

What is Saturn’s largest moon? Properties? 

Definition
TITAN, ONLY MOON WITH AN ATMOSPHERE, OPEN BODIES OF LIQUID (METHANE OR METHADINE)
Term

 What are the notable characteristics of Enceladus and Iapetus? 

Definition
E-ICY MOON GEOLOGICALLY ACTIVE (LIKE IO-HEATED BY TIDAL FORCES), I-HALF BRIGHT AND HALF DARK
Term

Which spacecraft have visited Uranus and Neptune? 

Definition
VOYAGER 2
Term

 Who discovered Uranus? How did astronomers know where to look for Neptune? 

Definition
HERSHEL, AFFECTS ORBIT OF URANUS
Term

What is Neptune’s largest moon? Properties and likely origin? 

Definition
TRITAN, KUIPER BELT
Term

What are the basic properties of Pluto, such as mass, composition, and distance from the Sun? 

Definition
SMALLEST, NOT A PLANET -PART OF KUIPER BELT, 40 AU FROM SUN, 250 YEARS TO ORBIT SUN ONCE
Term

Which spacecraft have visited Pluto? 

Definition
ZERO, ONE ON ITS WAY-NEW HORIZONS
Term

Who discovered Pluto? How? 

Definition
CLYDE TOMBAUGH, TOOK PHOTOGRAPHS, POINT OF LIGHT, TIMELAPSE PHOTOS
Term

How does the orbit of Pluto compare to the 8 planets? 

Definition
ELYPTICAL PLANE IS TILTED
Term

Why isn’t Pluto considered a planet? What is the official classification of Pluto now? Other members of this class? 

Definition
SERIUS-200 YEARS AGO, ERES-FEW YEARS AGO
Term

Which moon is a twin of Pluto? 

Definition
TRITON
Term

 How many moons does Pluto have? 

Definition
4
Term

What are the 3 regions of the solar system containing asteroids and comets? Typical orbital periods? 

Definition
ASTEROID BELT-SEVERAL YEARS, KUIPER BELT-100S OF YEARS, OORT CLOUD-MILLIONS OF YEARS 
Term

What are the largest known members of the Asteroid Belt and Kuiper Belt? 2nd largest?

Definition
 ASTEROID-SERIES AND VESTA, KUIPER-PLUTO AND ERES
Term

 What are comets and asteroids made of?

Definition
 COMETS- ROCKS AND METALS,  ASTEROIDS-ROCKS AND METAL
Term

Which probes have visited comets and asteroids? 

Definition
STAR DUST-COLLECTED DUST, FLY BY ASTEROID-GALILEO, DEEP IMPACT-, ORBITTING VESTA-DAWN
Term

What are meteoroids, meteors, falling stars, shooting stars, bolides, fireballs, and meteorites? 

Definition
METEOROID-IN SPACE AND SMALLER, METEORITE-MAKE TO GROUND, SHOOTING STAR, METEOR, FALLING STAR-BRIGHT METEORS
Term
What are the sizes of meteoroids? Ones that are able to reach the ground? 
Definition
1 METER
Term

What kind of spectrum does a meteor produce? 

Definition
EMISSION LINE
Term

What is the typical rate of meteors for a random night? During meteor showers? 

Definition
1 HOUR-4 METEORS, 1 EVERY MINUTE
Term

What is zodiacal light? 

Definition
GLOW NEAR HORIZON AFTER SUNSET/BEFORE SUNRISE, PRODUCED BY DUST IN SOLAR SYSTEM REFLECTED BY SUN
Term

Why is there no record of the early earth? 

Definition
EROSION, PLATE TECTONICS, LARGE IMPACTS
Term

How old is the earliest evidence for life? 

Definition
3.5 BILLION
Term

What is the Miller-Urey experiment? 

Definition
TRY TO REPRODUCE CONDITIONS OF YOUNG EARTH, AMINO ACIDS
Term

 What element is the basis for organic molecules? 

Definition
CARBON
Term

  What molecule is important for helping organic molecules combine into larger, more complex molecules (and life)?

Definition
 WATER
Term

   What is the habitable zone?

Definition
 RANGE OF DISTANCE AROUND STAR WHERE WATER CAN SURVIVE ON PLANETS 
Term
Why are very large and very small planets bad places for life to form? 
Definition
SMALL-CANT HOLD ONTO ATMOSPHERE, NO MAGNETIC FIELD AND NO PLATE TECTONICS; LARGE-WONT HAVE SOLID SURFACE 
Term

 The presence of which element in a planet’s atmosphere is evidence for life?

Definition
 OXYGEN
Term

  What are the 6 methods of searching for planets around other stars? 

Definition
PULSAR TIMING, ASTROMETRY, RADIAL VELOCITY, TRANSITS, LENSING AND IMAGING
Term

      Which 3 methods are used to detect the wobble of a star? 

Definition
ASTROMETRY, RADIAL VELOCITY, AND TRANSITS
Term

How does the velocity of a wobbling star depend on the planet’s distance and mass? 

Definition
LARGE MASS, SMALL ORBITS
Term

  How was the first planet outside of our solar system discovered? What kind of star does it orbit? 

Definition
RADIAL VELOCITY, 51 PEG IS THE STAR
Term

Which method has discovered the most planets?

Definition
 RADIAL VELOCITY
Term

How many planets have been found outside our solar system? 

Definition
400
Term

Which method of searching for planets has a large participation by amateur astronomers?

Definition
 TRANSIT
Term

   What is the name of the equation that estimates the number of communicating civilizations in our galaxy?

Definition
 THE DRAKE EQUATION
Term

What are some of the factors go into that equation?

Definition
# OF STARS, # OF STARS W/HABITABLE PLANETS, # OF HABITABLE PLANETS IN EACH SYSTEM, # OF HABITABLE PLANETS, ETc
Term

What wavelengths of light offer the best chance of communication with other civilizations? 

Definition
RADIO
Term

 Who discovered Venus has phases? 

Definition
Galileo
Term

Why doesn’t Venus transit the Sun every time it orbits the Sun? 

Definition
orbit of Venus is tilted relative to the orbit of Earth
Term

A larger fraction of Earth can see a transit of Venus than can see a solar eclipse. Why? 

Definition
Venus is farther away than the moon
Term

What is the main process that reshapes the surface of Venus and determines its age? 

Definition
Lava flows
Term

Which hemisphere of Mars has younger surface? 

Definition
Northern
Term

How was Valles Marineris created? 

Definition
As a fault
Term

What is the min amount of time needed for a radio transmission from Earth to arrive on Mars? 

Definition
4 minutes
Term

Which did not include an orbiter? 

Definition
Mars Pathfinder
Term

First rover to land on Mars? 

Definition
Sojourner
Term

If two planets have the same rotational periods (length of a day), but different diameters, for which one is the surface traveling at a higher velocity as it rotates? 

Definition
Larger planet
Term

If you obtained a spectrum of the aurora on Jupiter, what would you see? 

Definition
Emission spectrum
Term

Which orbited Jupiter? 

Definition
Galileo
Term

When the Sun becomes a red giant, Titan’s atmosphere will become: 

Definition
Thinner
Term

Triton used to be a part of… 

Definition
Kuiper Belt
Term

Which dwarf planet is smallest? 

Definition
Ceres
Term

Which dwarf planet was discovered first? 

Definition
Ceres
Term

Typical orbital periods of asteroids? 

Definition
Several years
Term

Typical orbital periods of Kuiper belt objects? 

Definition
100s of years
Term

Typical orbital periods of Oort cloud objects? 

Definition
Millions of years
Term

Average distance between asteroids in the asteroid belt? 

Definition
1,000,000 km
Term

Largest known member of Kuiper belt? 

Definition
Eris
Term

Short-period comets come from? 

Definition
Kuiper belt
Term

Compared to comets, meteors are… 

Definition
smaller in size and closer to us
Term

Spectrum seen from a meteor?

Definition
 Emission
Term

Blackbody emission=

Definition
infrared wavelengths
Term

Building block of all forms of life: 

Definition
carbon
Term

Habitable zone = 

Definition
water in liquid form
Term

The velocity of a star as it wobbles will be faster if the orbiting planet is…

Definition
 closer to the star and has more mass
Term

Which planets are easiest to detect via transits? 

Definition
Large planets
Term

How many planets have been found around other stars? 

Definition
500
Term

What technique was used to find the first known planet around another star? 

Definition
Pulsar timing
Term

Which technique is practiced by amateur astronomers with small telescopes? 

Definition
lensing
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