National Aeronautics and Space Administration 
This book Belongs to: 
Gateway 

What is Gateway?

The Artemis Program will land the frst woman and person

of color on the Moon for scientifc discovery and to enable

human missions to Mars. An important part of Artemis is

NASA’s lunar-orbiting station called Gateway. Gateway is

where astronauts from many countries will eat, sleep, rest,

conduct science experiments, and get ready for their trips

to the lunar surface. 

The frst two pieces of Gateway are the Power and Propulsion 

Element, or PPE, and the Habitation and Logistics Outpost,

or HALO, where astronauts will live. PPE and HALO will

launch together from Earth to lunar orbit. 

3 
Power & Propulsion Element 

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Power & Propulsion Element 

Pictured: The Gateway space station with PPE highlighted (Credit: NASA) 

What is the PPE? 

The Power and Propulsion Element (PPE) is the powerhouse 

for the Gateway space station. 

PPE will provide the lunar outpost with power to keep its 

computers running and to stay in its orbit around the Moon. 

PPE will also provide communications so that people on 

Earth can talk to astronauts on the surface of the Moon. 

It will also be a fying laboratory where computers and 

astronauts will conduct science experiments to better

understand the solar system that we live in. 

5 

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Space word search 

Can you fnd all the hidden space words? 

A H O U F H H D L K M G P R W D C O P E D M I X T A R 

G S U I M S I E W R Z Y X K M C U I A P A Z O M K D S 

L B R U T X P S V G I O L A O T F N M I M S T X X Y Y 

J D R N U H W D I X Q R T H G I L F D C N T I C P 

J U V O X T B N H V Z V K T W G U S T W W J H R L 

S T R E E N I G N E C E X E J B S N I K R F C P C 

T V N G I C M U B X O R W V F W T N G N S M P R Z 

D I Q S I M E T R A L O R U E J R X U E L S S D E 

N O I T A V O N N I N A X Z S C I E N C E I U U P 

T C T N N V R H B W V X D O S P R Y M H A J C 

U S J C A X K C J C J E R E W O P L Q M S A B 

P C I R M Q V Z A C I K O A S W H S Y K F C S 

F N Z A X N I D S H T M K V C P D U D Y M N S 

S F Z K H R R A T N I B T N I J A S G I Q 

T Z Y X V E L S E O J T O Y R I Y B L T S 

J G R Z U L L M S P A C E C R A F T H G S 

V F O E Z T D E L Y E Q K L P V J P K J F 

A M S M M X E C T K E A Q X T H Y O T 

G C F J S A N L O A G W J A T Q E E G 

O O F E Q A N G Y R E V O C S I D 

D L V S Z S W O T A Q L P 

V M B S K E B P A 

O Z C 

G O R B I T B E T Z U K C T N V N 

F T O B C F A Z P M V O V 

A N G A T E W A Y 

S X K 

Word Bank 

Safety Power Propulsion Orbit Moon 

Artemis Sun Earth Spacecraft Exploration 

Engineer Flight Communication Astronaut Rocket 

Innovation Science Technology Universe Discovery 

NASA Gateway 

6 
Gateway & the moon 

Fun Fact: 

PPE will launch 

together with HALO, 

a part of Gateway 

where astronauts will 

live. Astronauts will 

later attach three more 

pieces of Gateway, for 

a total of fve! 

t 

t 

7 
solar power 

Roll-Out Solar Arrays 

Fun Fact:

From tip to tip of 

the solar arrays, 

the PPE is about 

as long as half of a 

football feld! 

i 

How is the PPE powered? 

Two large roll-out solar arrays, or ROSAs, will absorb the 

sun’s energy to power Gateway. 

8 
roll-out solar arrays 

➔ 

Pictured: They’re called “roll-out solar arrays” 

because they roll themselves out, kind of like a rug! 

What makes ROSAs different from solar panels 

on Earth? 

You might already know about solar panels. Your own home 

may even have solar panels on the rooftop. They do the 

same thing as ROSAs, capturing solar energy and turning 

it into electricity. However, to be used in space, you need 

ROSAs because they are lightweight and can ft inside of a 

rocket for launch. 

For the PPE, the fexible ROSAs are rolled up for launch and 

then rolled out once they’re in space. ROSAs are already 

used on the International Space Station, and they may be 

used on future spacecraft to Mars and beyond! 

9 
connect the dots 

6

1

2

3

4

5

7

8

9

10 11

12

13

14

15

16

18

19 20

21

22

HALO 

Thruster 

(Habitat and 

Logistics Outpost) 

where astronauts will 

live and prepare for 

science expeditions 

to the Moon’s surface 

while visiting Gateway 

Antenna 

Solar Array 

captures and sends 

radio signals between 

the Earth and Moon 

creates force that 

moves Gateway 

through space 

long panels of 

solar cells that 

change sunlight 

into electricity 

Star Tracker 

takes pictures of star 

patterns and uses them 

as a map so Gateway 

knows where it is 

around the Moon 

PPE 

(Power and 

Propulsion Element) 

Gateway’s powerhouse 

that keeps the lights 

on and helps the small 

space station fy around 

the Moon 

10 17

.. • ✓ ....... 

CJ'. ~ 

. ~ c· . . . . 
Hint: Want some clues? Look at the pictures! 

GVRATYI 

STOTAIN 

SAEITLLET 

MNOO 

SAEPC 

STASR 

DTAA 

LCHUNA 

MSISINO 

SOEFWTRA

ETHRA 

RCEKTO 

Write in the special shape letters to find the final word: 

What is the name of the space station that will orbit the Moon? 

HInt: 

Want some clues? Look at 

the pictures on this page! 

11 

.. 

*-----◊ 

-□------­

____ D 

__ Q _ 

____ Q __ _ 

_ Q __ _ 

space word scramble 

Unscramble the letters to make space related words! 
gateway’s polar orbit 

Gateway will take one week to fy around the Moon in 

what is known as a “polar orbit,” because Gateway will 

travel over both the Moon’s North and South Poles. 

Why was it chosen? 

ACCESS 

Gateway’s orbit is 

easy to access from 

Earth by many types 

of spacecraft, and 

will allow astronauts 

to land on every part 

of the lunar surface. 

COMMUNICATIONS 

The orbit allows people 

on Earth to talk to 

people on the Moon! 

MARS AND 

BEYOND! 

Gateway could be a place 

to prepare for human 

missions to Mars and 

beyond! 

STABILITY 

Gateway’s polar orbit is 

balanced between the 

gravity of the Earth and 

Moon, making it easy to fy 

with less energy! 

SCIENCE 

Gives scientists and 

astronauts a great view 

of the Earth, Moon, 

sun, and deep space 

so we can study them 

all from the same orbit. 

12 
propulsion 

13 

How does the PPE move Gateway?

PPE stands for Power and Propulsion Element. Propulsion 

means to push forward, or drive an object forward. As 

Gateway’s propulsion system, the PPE’s job is to produce 

thrust, or the force that moves things through space. This 

thrust is generated when PPE combines the Sun’s energy 

collected by the solar arrays with a xenon plasma, creating 

an electric propulsion that produces the thrust to propel 

the spacecraft. 

Fun Fact: 

PPE accelerates 

propellant at speeds 

up to 51,000 miles 

per hour! 

Forces Acting on a Rocket 

Center of pressure 

Center of gravity 
a new generation of astronauts 

Gateway will support long-term science and human 

exploration on and around the Moon. Can you draw 

yourself as an astronaut on a lunar mission? 

14 
your lunar mission story 

Fill in the words to make your own story! 

In the future year __________ , you’ll be invited by NASA to 

year 

embark on a mission into space! You’ll travel to the lunar 

space station with a team of __________ astronauts for the number 

__________ mission, and step foot on the Moon! They picked 

name 

you because you’re really good at __________. On this mission, 

activity 

you’ll study __________ , and send information back to your 

noun 

team on Earth at __________. 

location 

You’ll get to the lunar space station by riding on the __________ 

adjective 

__________ rocket. It will be powered by __________ and 

name noun 

travels at __________ miles per hour! Your crew is coming with number 

you, including your best friend __________. To keep yourself 

name 

entertained, you’ll pack __________ and play __________ with 

noun game 

your friend. You’ll bring __________ to remember Earth while 

noun 

you’re away. While in space, you’ll see __________! plural noun 

You’ll live in space for __________ months. You’ll wear a number 

__________ spacesuit that looks __________ , and bring 

color adjective 

__________ and __________ to eat and drink. When you 

food drink 

visit the Moon’s surface, you’ll stay there for __________ time 

and travel using a __________ . Your studies on __________ 

noun topic 

will beneft __________ and help scientists learn how to 

plural noun 

travel to __________! 

planet 

15 
Pick out the PPE 

Can you fnd the PPE? It has a rectangular 

body and two large rectangular solar arrays. 

16 
power & propulsion element maze

START

FINISH

Fun Fact:

PPE provides 

Gateway with power, 

communications, 

and steering for deep 

space travels! 

17 
Us, quatibus nulparchit, conest doluptas Uci totatio. Nemoluptati rem que cus 

Mercur

V

y

enus 

Earth 

Moon 

Mars 

Jupiter 

Saturn 

Uranus 

Sun 

Fun Fact: 

The farthest humans have 

traveled from Earth is 

248,655 miles, set during 

he Apollo 13 mission. They 

passed over the far side 

of the Moon, setting the 

record on April 15, 1970. 

t

Neptune 

*not to scale 

our solar system 

18 
Answer Key 

O Z C 

V M B S K E B P A 

D L V S Z S W O T A Q L P 

19 

START

FINISH

GVRATYI 

STOTAIN 

SAEITLLET 

MNOO 

SAEPC 

STASR 

DTAA 

LCHUNA 

MSISINO 

SOEFWTRA 

ETHRA 

RCEKTO 

Write in the special shape letters to find the final word: 

What is the name of the space station that will orbit the Moon? 

Hint: Want some clues? Look at the pictures! 

G R A V I T Y 

S T A T I O N 

S A T E L L I T E 

M O O N 

S P A C E 

S T A R S 

D A T A 

L A U N C H 

M I S S I O N 

S O F T W A R E 

E A R T H 

R O C K E T 

G A T E W A Y 

Page 6 

Page 17 

Page 16 

Page 11 

A H O U F H H D L K M G P R W D C O P E D M I X T A R 

G S U I M S I E W R Z Y X K M C U I A P A Z O M K D S 

L B R U T X P S V G I O L A O T F N M I M S T X X Y Y 

J D R N U H W D I X Q R T H G I L F D C N T I C P 

J U V O X T B N H V Z V K T W G U S T W W J H R L 

S T R E E N I G N E C E X E J B S N I K R F C P C 

T V N G I C M U B X O R W V F W T N G N S M P R Z 

D I Q S I M E T R A L O R U E J R X U E L S S D E 

N O I T A V O N N I N A X Z S C I E N C E I U U P 

T C T N N V R H B W V X D O S P R Y M H A J C 

U S J C A X K C J C J E R E W O P L Q M S A B 

P C I R M Q V Z A C I K O A S W H S Y K F C S 

F N Z A X N I D S H T M K V C P D U D Y M N S 

S F Z K H R R A T N I B T N I J A S G I Q 

T Z Y X V E L S E O J T O Y R I Y B L T S 

J G R Z U L L M S P A C E C R A F T H G S 

V F O E Z T D E L Y E Q K L P V J P K J F 

A M S M M X E C T K E A Q X T H Y O T 

G C F J S A N L O A G W J A T Q E E G 

O O F E Q A N G Y R E V O C S I D 

G O R B I T B E T Z U K C T N V N 

F T O B C F A Z P M V O V 

A N G A T E W A Y 

S X K 

( 

*-----◊ 

-□ 

__ Q_ 

-

____ O_ 

_Q_ 

~~~

~~

~~, 
Follow us: 

@NASAGateway 

@NASA_Gateway 

www.nasa.gov/gateway 

National Aeronautics and Space Administration 

Glenn Research Center 

21000 Brookpark Road 

Cleveland, Ohio 44135 

www.nasa.gov/glenn 

www.nasa.gov 

NP-2024-11-106-GRC