The average distance from Earth to the sun is

1 ly

1 milli

on km

1 milli

on mi.

1 billion km 1 AU

0% 0% 0%0%0%

1. 1 ly2. 1 million km3. 1 million mi.4. 1 billion km5. 1 AU

A typical galaxy like our Milky Way galaxy contains

primarily

planets.

gas o

nly

stars

(some w

ith planets.

.

a single st

ar and planets.

0% 0%0%0%

1. primarily planets.2. gas only3. stars (some with

planets), gas and dust

4. a single star and planets.

Which is the greatest distance?

Earth

to th

e moon.

Earth

to th

e sun.

Earth

to th

e Astero

id Belt.

Earth

to th

e Kuiper Belt

0% 0%0%0%

1. Earth to the moon.2. Earth to the sun.3. Earth to the

Asteroid Belt.4. Earth to the Kuiper

Belt

In the diagram below, what is the diameter of Jupiter?

about 350,0about 3

50,0..

about 700,000 km

about 14,000 km

about 140,000 km

0% 0%0%0%

1. about 350,0about 350,000 km

2. about 700,000 km3. about 14,000 km4. about 140,000 km

If we say that an object is 1,000 light-years away we see it

as it lo

oked 1,000 years ...

as it w

ould appear to ou...

as it lo

oked 1,000 light-y

...

as it is

right n

ow, but it

...

0% 0%0%0%

1. as it looked 1,000 years ago.

2. as it would appear to our ancestors 1,000 years ago.

3. as it looked 1,000 light-years ago.

4. as it is right now, but it appears 1,000 times dimmer.

Which sequence is correct when ordered by increasing size?

Earth

, Solar S

ystem, M

i...

Solar S

ystem, E

arth, g

ala..

Earth

, Milk

y Way Galaxy

...

Galaxy

cluste

rs, Solar S

...

0% 0%0%0%

1. Earth, Solar System, Milky Way Galaxy, clusters of galaxies

2. Solar System, Earth, galaxy clusters, Milky Way Galaxy

3. Earth, Milky Way Galaxy, Solar System, galaxy clusters

4. Galaxy clusters, Solar System, Milky Way Galaxy, Earth

How is a planet different than a star?

Planets are

large

r than s.

..

Planets re

flect lig

ht whil..

.

Stars

move faste

r in th

e ...

Planets are

brighter t

han...

0% 0%0%0%

1. Planets are larger than stars.

2. Planets reflect light while stars produce light.

3. Stars move faster in the sky than planets.

4. Planets are brighter than stars.

The celestial equator is

the path

that t

he sun a...

the dividing l

ine betwee...

a line aro

und the sk

y dir.

..

a and b.

b and c.

0% 0% 0%0%0%

1. the path that the sun appears to follow on the celestial sphere as Earth orbits the sun.

2. the dividing line between the north and south celestial hemispheres.

3. a line around the sky directly above Earth's equator.

4. a and b.5. b and c.

The ____ is the point on the celestial sphere directly above an observer who can be at any

point on the Earth..

north ce

lestial p

ole nadir

zenith

celesti

al equato

r

0% 0%0%0%

1. north celestial pole2. nadir3. zenith4. celestial equator

The apparent visual magnitude of a star is a measure of the star's

size

.

inte

nsity.

distance

.

color.

temperat

ure.

0% 0% 0%0%0%

1. size.2. intensity.3. distance.4. color.5. temperature.

The wobbling precession of the rotation axis of Earth is caused by

1. the force of gravity from the sun and moon on Earth's equatorial bulge.

2. the force of gravity from the sun and Jupiter on the Earth-moon system.

3. the magnetic field of Earth.4. the formation and subsequent

melting of glaciers during the ice-ages.

5. the impact of asteroids.

You visit a latitude of 28° N. What is the angle between the northern horizon and the north

celestial pole? ANSWER 21. 62°2. 28°3. 40°4. 23°5. 5°

1. 2.

3.

4. 5.

An observer in the Northern Hemisphere at our lattitude takes a time exposure photograph of the night sky. If the illustration

below depicts the photograph taken by the observer, which direction was the camera pointing?

1. straight north2. straight east3. straight south4. straight west

An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction

was the camera pointing?

1. straight north2. straight east3. straight south4. straight west

The lower the number the greater the apparent visual magnitude. (negative numbers are greater than positive numbers)

The star Vega has an apparent visual magnitude of 0.03 and the star HR 4374 has an apparent visual magnitude of 4.87. It has been determined that both stars are at the same distance from Earth. Thus, Vega MUST _____________.

1. be closer to Earth than HR 4374.2. be farther from Earth than HR

4374.3. produce less energy/second

than HR 4374.4. produce more energy/second

than HR 4374.

Table 2-1[Table]

Refer to Table 2-1. Which star in the table would appear the SECOND brightest to an observer on Earth?

a Cet

a CMa

Nim

r Per

d Dra

0% 0% 0%0%0%

1. a Cet2. a CMa3. Nim4. r Per5. d DraStar

NameApparent VisualMagnitude

d Dra 3.07

a Cet 2.53

r Per 3.98

Nim 8.07

a Cma -1.46

Table 2-1[Table]

On Earth, the unaided eye can see apparent visual magnitudes < 7.0. Refer to Table 2-1. Which star in the table would not be visible to the unaided eye of an observer on Earth?

a Cet

a Cma N

im r P

er d D

ra

0% 0% 0%0%0%

1. a Cet2. a Cma3. Nim4. r Per5. d Dra

How much of the night sky is NORTH of the celestial equator?

Less

than one-h

alf, beca

u..

More

than one-h

alf, b

ec...

Exactl

y one-h

alf.

Depends o

n the se

ason.

0% 0%0%0%

1. Less than one-half, because of the tilt of the equator to the ecliptic plane.

2. More than one-half, because of the precession of the poles.

3. Exactly one-half.4. Depends on the season.

If the Sun passes directly overhead on at least one day per year, then

you are

with

in 23&#189...

you are

with

in 66&#189...

you m

ust be exactl

y on ...

you co

uld be anywhere

...

0% 0%0%0%

1. you are within 23½° latitude of the equator.

2. you are within 66½° latitude of the equator.

3. you must be exactly on the equator.

4. you could be anywhere because this occurs at least once per year at any location on the Earth.

Stars in the same constellation

probably fo

rmed at t

he...

must

be part of t

he sam...

must

have been discove

...

may a

ctually

be very

dif...

0% 0%0%0%

1. probably formed at the same time.

2. must be part of the same cluster of stars in space.

3. must have been discovered at about the same time at the same location in space.

4. may actually be very different distances away from the observer and from each other.

If the Earth's period of rotation doubled, but the period of revolution stayed the same each night

would be

twice

as long and th

e ...

half as l

ong and th

e nu...

0%0%

1. twice as long and the number of days per year would reduce in half

2. half as long and the number of days per year would double

The diagram below shows three approximate locations of the sun along the western horizon. Which number

indicates the location of the sun at on June 21st for an observer in the Cleveland Ohio area?

1 2 3

0% 0%0%

1. 12. 23. 3

The diagram below shows three approximate locations of the sun along the western horizon. Which number

indicates the location of the sun at sunset on the vernal equinox and autumnal equinoxes(respectively) for an

observer at a latitude of 48° S?

1,3 2,3 3,2 2,1 2,2

0% 0% 0%0%0%

1. 1,32. 2,33. 3,24. 2,15. 2,2

Northern Hemisphere winters are colder than Northern Hemisphere summers because

Earth

is cl

oser t

o the su

...

the sn

ow that f

alls in

th...

the lig

ht fro

m the su

n s...

the perio

d of sunlig

ht is...

c and d

0% 0% 0%0%0%

1. Earth is closer to the sun during the summer than it is during the winter.

2. the snow that falls in the northern latitudes cools Earth during the winter.

3. the light from the sun shines more directly on the Northern Hemisphere during the summer.

4. the period of sunlight is longer during the summer than during the winter.

5. c and d

______________ is the point in Earth's orbit where Earth is closest to the sun.

Aphelion

Perihelio

n

Prece

ssion

The winte

r solsti

ce

0% 0%0%0%

1. Aphelion2. Perihelion3. Precession4. The winter solstice

The planet of our solar system that are never visible to the naked eye are

Pluto.

Mercu

ry and Venus.

Mars,

Saturn

, Ura

nus, ...

Neptu

ne

0% 0%0%0%

1. Pluto.2. Mercury and Venus.3. Mars, Saturn,

Uranus, Neptune.4. Neptune

On the autumnal equinox the sun is

on the ce

lestial e

quator..

.

on the ce

lestial e

quator..

.

0%0%

1. on the celestial equator and moving north with respect to the equator.

2. on the celestial equator and moving south with respect to the equator.

When Earth passes between the Sun and the Moon, which occurs?

a lunar e

clipse

a solar e

clipse

an annular ecli

pse

a terre

strial e

clipse

0% 0%0%0%

1. a lunar eclipse2. a solar eclipse3. an annular eclipse4. a terrestrial eclipse

A solar eclipse that occurs when the moon's umbra reaches Earth's surface and blocks out all

of the sun’s light is called a(n) ____ eclipse.

total s

olar

partial s

olar

annular solar

penumbral so

lar

0% 0%0%0%

1. total solar2. partial solar3. annular solar4. penumbral solar

A totally eclipsed moon glows coppery red because

the m

oon&#039; s

urface

..

red lig

ht is co

oler than bl..

during a lu

nar ecli

pse th

...

only re

d light is

able to ...

0% 0%0%0%

1. the moon' surface is made of iron ore which is red in color.

2. red light is cooler than blue light.3. during a lunar eclipse the sun is

cooler than normal and its light is more red.

4. only red light is able to pass completely through Earth's atmosphere and reach the moon.

The lowest amount of solar energy per square meter upon the surface of Earth in the northern

hemisphere is on or about

Dece

mber 21, th

e winter..

.

March

21, the ve

rnal e

q...

September 2

1, the aut..

.

June 21, th

e summer s

ols...

0% 0%0%0%

1. December 21, the winter solstice.

2. March 21, the vernal equinox.

3. September 21, the autumnal equinox.

4. June 21, the summer solstice.

Newton concluded that a force from the Earth had to act on the moon because

the m

oon move

d at a c.

..

a force

is needed to

pull...

a force

is needed to

acce...

0% 0%0%

1. the moon moved at a constant velocity in a straight line.

2. a force is needed to pull the moon outward.

3. a force is needed to accelerate the moon toward Earth away from straight-line motion.

The age of the moon is approximately:

4.5 billion ye

ars

2.5 milli

on years

15 billion ye

ars

unknown

0% 0%0%0%

1. 4.5 billion years2. 2.5 million years3. 15 billion years4. unknown

The phase of the Moon on a particular night is determined by the

seaso

n of the year.

speed of t

he Moon in

is ...

relative

positions o

f the...

dist

ance fr

om the Earth

..

0% 0%0%0%

1. season of the year.2. speed of the Moon in is

orbit.3. relative positions of the

Sun, Earth, & Moon.4. distance from the

Earth to the Moon.

Which phase of the Moon occurs between the first quarter and full moon?

new moon

wax

ing gibbous

wan

ing cre

scent

wan

ing gibbous

0% 0%0%0%

1. new moon2. waxing gibbous3. waning crescent4. waning gibbous

On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in

London would see

a full m

oon.

a first quart

er moon.

a new moon.

a third

quarter m

oon.

0% 0%0%0%

1. a full moon.2. a first quarter

moon.3. a new moon.4. a third quarter

moon.

The composition of the Moon most closely resembles _____ leading to the theory that the moon was formed from a huge

collision of an object with the Earth after it accreted and differentiated during formation.:

Earth

&#8217;s co

re

Earth

&#8217;s mantle

Earth

&#8217;s cru

st M

ars

0% 0%0%0%

1. Earth’s core2. Earth’s mantle3. Earth’s crust4. Mars

The periods of the Moon’s rotation and revolution are equal. This results in:

lunar e

clipse

s

lunar p

hases

neap tides

the sa

me side alw

ays fa

c...

0% 0%0%0%

1. lunar eclipses2. lunar phases3. neap tides4. the same side

always facing earth

Retrograde motion

is obse

rvable fo

r planets.

..

is obse

rvable fo

r plane..

0%0%

1. is observable for planets located between Earth and the sun.

2. is observable for planets more distant from the Sun than is Earth.

Galileo's telescopic observations of a complete set of phases of Venus proved

that V

enus orb

ited th

e sun.

that E

arth orb

ited th

e sun.

that a

ll of t

he planets or..

.

that V

enus had an atm

o...

0% 0%0%0%

1. that Venus orbited the sun.

2. that Earth orbited the sun.

3. that all of the planets orbited the sun.

4. that Venus had an atmosphere.

Galileo's telescopic discoveries of mountains on the moon and spots on the sun were controversial because

they suggested that the sun and moon

were th

e same ki

nd of o...

were not p

erfect

sphere

s.

were in

habited.

orbite

d each oth

er.

0% 0%0%0%

1. were the same kind of object.

2. were not perfect spheres.

3. were inhabited.4. orbited each other.

The force of gravity from one object extends to infinity never going to zero and works for atomic level observations, planetary motion, black holes and dark matter hypothesis. When we say

that gravitation is universal we mean that

the Earth

exerts

gravita

...

the Earth

exerts

a gravit..

.

the Earth

, moon and su

n...

all mate

rial o

bjects in

th...

0% 0%0%0%

1. the Earth exerts gravitational force on objects on its surface

2. the Earth exerts a gravitational force on its moon and vice versa

3. the Earth, moon and sun exert gravitational forces on each other

4. all material objects in the universerse exert gravitational forces on one another.

The diagram below illustrates a portion of the model for the universe described by Ptolemy. The small circular paths the planets travel as they orbit

the sun are referred to as

ellipse

epicycle

s

terra

forms

gravit

y loops

0% 0%0%0%

1. ellipse2. epicycles3. terraforms4. gravity loops

In pre-Copernican astronomy, it was almost universally believed that

the planets

traveled in

el...

the ce

nter of t

he univer..

the Sun w

as at t

he cente...

the Earth

was

at the ce

n...

0% 0%0%0%

1. the planets traveled in elliptical orbits about the Earth.

2. the center of the universe was the Sun with the Milky Way representing other distant planets.

3. the Sun was at the center of the universe.

4. the Earth was at the center of the universe.

The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other

focus?

Noth

ing Ea

rth

Satu

rn

Jupite

r

0% 0%0%0%

1. Nothing2. Earth3. Saturn4. Jupiter

A which labeled interval of its orbit would the planet move with the greatest velocity since Kepler's second law states plantary orbits are not a constant speed, thus a planet should move at

its greatest speed when closest to the sun?

A B C D

0% 0%0%0%

1. A2. B3. C4. D

Which correctly identifies the location of the asteroid belt?

A B C D

0% 0%0%0%

1. A2. B3. C4. D

Which correctly identifies the location of the Kuiper belt?

A B C D

0% 0%0%0%

1. A2. B3. C4. D

Astronomers build telescopes on tops of mountains because

there

is le

ss air

to dim

light.

the se

eing is better.

a and b

0% 0%0%

1. there is less air to dim light.

2. the seeing is better.3. a and b

A ____ has a few million light sensitive diodes in an array typically about a half-inch square that

allows images to be digitized and computerized.

photometer

charge-co

upled device

spectr

ograph

0% 0%0%

1. photometer2. charge-coupled

device3. spectrograph

Photons of red light have a longer wavelength, a lower frequency and thus less energy than photons of blue light. The apparent spectral color shift of the stars in the sky suggest the expanding universe as objects appear to be

going away from the central point of the big bang is supported by

a red sh

ift

a blue shift

0%0%

1. a red shift2. a blue shift

Which of the following sequences of electromagnetic radiation is correct in order of

increasing energy?

Gamma ra

ys, X

-rays

, infr.

..

Radio, micr

owave, gam..

Visible, U

V, X-ra

ys, gamm...

Visible, m

icrowav

e, radio...

0% 0%0%0%

1. Gamma rays, X-rays, infrared, radio

2. Radio, microwave, gamma rays, UV

3. Visible, UV, X-rays, gamma rays

4. Visible, microwave, radio, infrared

A telescope whose objective is a lens and contains bent glass lenses and no mirrors is a(n)

____ telescope.

Refracti

ng

Reflecting

Deflecti

ng

Compound

Retracti

ng

0% 0% 0%0%0%

1. Refracting2. Reflecting3. Deflecting4. Compound5. Retracting

In a reflecting telescope the objective is a ____.

prism

mirr

or le

ns

diffra

ction gr

ating

0% 0%0%0%

1. prism2. mirror3. lens4. diffraction grating

Observation that supernovae appear fainter than expected at large redshifts.has prompted astronomers

to ponder the possible existence of dark energy.

True

False

0%0%

1. True2. False

Observation that the universal law of gravitation equation does not allow for sufficient mass to explain some motions have led

scientists to ponder the possible existence of dark matter.

True

False

0%0%

1. True2. False

Which of the following is the hottest type of star?

blue supergi

ant

red dwarf

red gi

ant

white

dwarf

0% 0%0%0%

1. blue supergiant2. red dwarf3. red giant4. white dwarf

Which process tha throws atoms together to make new atoms of larger elements releases huge amounts of

energy that causes a star to shine?

nuclear fi

ssion

nuclear f

usion

0%0%

1. nuclear fission2. nuclear fusion

A theoretical celestial object that has such strong gravitational attraction, light is prevented

from escaping its surface is a

black hole

pulsar

nebula

sunsp

ot

0% 0%0%0%

1. black hole2. pulsar3. nebula4. sunspot

Accretion is

the adding of m

ateria

l t...

the adding of m

ateria

l t...

the re

lease of g

as fro

m r...

0% 0%0%

1. the adding of material to an object an atom or molecule at a time.

2. the adding of material to an object by collection of solid particles.

3. the release of gas from rocks as they are heated.

Which one of the following IS a characteristic of Jovian planets?

low ave

rage

density

very

few sa

tellit

es

crate

rs in old su

rface

s

small d

iameters

0% 0%0%0%

1. low average density2. very few satellites3. craters in old

surfaces4. small diameters

A(n) ____ is a solar system object that enters Earth's atmosphere and becomes very hot due to friction between the object and Earth's atmosphere and does not survive to reach the surface.

astero

id

meteor

comet

planetesimal

0% 0%0%0%

1. asteroid2. meteor3. comet4. planetesimal

Once a terrestrial planet had formed from a large number of planetesimals, heat could have melted it and allowed it to differentiate into metallic core of ____density and a rocky

mantle or crust of ______ density.

higher; lower

lower;

higher

Wro

ng! interio

r sta

ys so

lid

0% 0%0%

1. higher; lower2. lower; higher3. Wrong! interior

stays solid

The large planetesimals would have grown faster than the smaller planetesimals because

they w

ere m

oving faste

r ..

their s

tronge

r gra

vity w

...

there

was m

ore mate

rial...

the sm

aller p

lanetesim

a..

0% 0%0%0%

1. they were moving faster in their orbits than the smaller planetesimals.

2. their stronger gravity would pull in more material.

3. there was more material located near them that could be accreted.

4. the smaller planetesimals were covered by a layer of material that was lost during collisions.

The oxygen in Earth's atmosphere

was

manufac

ture

d insid

...

was

added to th

e atmo...

has incre

ased si

nce Ear.

..

all of t

hese

0% 0%0%0%

1. was manufactured inside stars.

2. was added to the atmosphere by plant life.

3. has increased since Earth’s origin.

4. all of these

Earth possesses few visible craters and the moon possesses many. This is because

Earth

form

ed late

r than...

the m

oon doesn&#039;t.

..

erosio

n and plate te

cton...

only b and c

0% 0%0%0%

1. Earth formed later than the moon and, therefore hasn't encountered as many meteoroids.

2. the moon doesn't have an atmosphere that could burn up many of the meteorites before impacting.

3. erosion and plate tectonics have slowly removed evidence of past cratering on Earth.

4. only b and c

In the giant impact theory of the Moon's origin,

the M

oon broke

from a ...

the Earth

and its

Moon ...

the M

oon form

ed elsew...

the M

oon form

ed when ...

0% 0%0%0%

1. the Moon broke from a rapidly spinning Earth

2. the Earth and its Moon formed from the same cloud of matter

3. the Moon formed elsewhere in the solar nebula and was later captured by Earth.

4. the Moon formed when a very massive planetesimal smashed into the young Earth.

The greenhouse effect keeps Venus hot and the increasing levels of this same gas in Earth’s atmosphere suggests the beginning a global warming. because both

atmosp

heres c

ontains fr..

atmosp

heres a

re pre

do...

surfa

ces c

onvert

infrare

d...

surfa

ces a

re fr

ee of sulfu

...

0% 0%0%0%

1. atmospheres contains free oxygen.

2. atmospheres are predominently carbon dioxide.

3. surfaces convert infrared into gamma radiation.

4. surfaces are free of sulfur compounds.

The flow patterns found on the surface of Mars and the number of craters on top of them

suggest that

Mars

is to

day a liq

uid w...

the cl

imate

on Mars

was ...

volca

nism is

occurri

ng ..

0% 0%0%

1. Mars is today a liquid water-rich world.

2. the climate on Mars was different billiond of years ago.

3. volcanism is occurring on Mars.

Which of the solar system objects listed below is most similar to Earth in terms of mass and

density?

Mercu

ry

Moon

Venus M

ars

Deim

os

0% 0% 0%0%0%

1. Mercury2. Moon3. Venus4. Mars5. Deimos

The graph below plots the escape velocity of each planet along the vertical axis and its surface temperature along the horizontal. The lines plotted in the figure are the speeds of the fastest gas particles as a function of temperature for various gases. Which of the gases plotted in the diagram could be retained in the atmosphere of Mars perhaps suggesting it

could be warmed up and support humans if terra-formed?

only CO2

only NH3

CO2, NH3, a

nd O2

H2 and H

e

0% 0%0%0%

1. only CO2

2. only NH3

3. CO2, NH3, and O2

4. H2 and He

The greenhouse effect produces excess heat in a planet's atmosphere by

trapping in

frared ra

diati..

clouds b

locking th

e surfa

..

trapping lig

ht gase

s fro

...

trapping ultr

aviolet light ..

0% 0%0%0%

1. trapping infrared radiation from escaping into space.

2. clouds blocking the surface from receiving any infrared radiation.

3. trapping light gases from escaping into space.

4. trapping ultraviolet light in the upper atmosphere of the planet.

Which of the terrestrial planets has the most difficult time retaining an atmosphere because it

is too hot?

Mercu

ry

Venus Ea

rth M

ars

0% 0%0%0%

1. Mercury2. Venus3. Earth4. Mars

Jupiter does not have

a hot inte

rior.

conve

ction occu

rring i

n i..

crusta

l plate

s on its

surfa

ce.

a dynamo effect.

0% 0%0%0%

1. a hot interior.2. convection

occurring in its atmosphere.

3. crustal plates on its surface.

4. a dynamo effect.

Small bodies that orbit planets are called

comets.

moons.

planetesimals

.

proto

planets.

0% 0%0%0%

1. comets.2. moons.3. planetesimals.4. protoplanets.

A region of the solar system that starts just beyond Neptune’s orbit, which contains dwarf planets and

other small bodies made mostly of ice, is called

the Kuiper B

elt.

the outer a

tmosp

here.

the aste

roid belt.

the TNO.

0% 0%0%0%

1. the Kuiper Belt.2. the outer

atmosphere.3. the asteroid belt.4. the TNO.

A rotating cloud of gas and dust from which Earth’s solar system formed is called a (and 99% of the matter

from this nowcontained in the sun)

solar

nebula.

supern

ova.

solar

eclipse

.

sate

llite.

0% 0%0%0%

1. solar nebula.2. supernova.3. solar eclipse.4. satellite.

Neptune’s Great Dark Spot and Jupiter’s Great Red Spot are

vast

canyo

ns.

raging st

orms.

froze

n oceans.

massi

ve volcanos.

0% 0%0%0%

1. vast canyons.2. raging storms.3. frozen oceans.4. massive volcanos.

The planet with the most complex set of rings is

Neptu

ne.

Satu

rn.

Jupite

r.

Ura

nus.

0% 0%0%0%

1. Neptune.2. Saturn.3. Jupiter.4. Uranus.

Meteors are often called

long-p

eriod co

mets.

shooting s

tars.

meteorit

es.

0% 0%0%

1. long-period comets.2. shooting stars.3. meteorites.

What kind of bodies do scientists monitor, hoping to predict and avoid future collisions?

sate

llites

planetesimals

near-Eart

h astero

ids

0% 0%0%

1. satellites2. planetesimals3. near-Earth asteroids

The terrestrial planets are all made of

hydroge

n only.

Heliu

m only.

Hyd

rogen, H

elium only.

mostl

y rock

, metal.

0% 0%0%0%

1. hydrogen only.2. Helium only.3. Hydrogen, Helium

only.4. mostly rock, metal.

From which of these planets do we have known samples of material?

Mercu

ry

Venus.

Mars

All of t

he above

0% 0%0%0%

1. Mercury2. Venus.3. Mars4. All of the above

The planets in part A of this diagram have more moons than the planets in part B.

True

False

0%0%

1. True2. False