Exoplanets by Seymour Simon. 2018. New York: HarperCollins.
Genre: Nonfiction picture book
Levels: Grades 3 and up (Adults will enjoy and learn much from this book)
Features: Incredible photos and illustrations, glossary, index, guide to further reading, and Author’s Note.


Whenever author Seymour Simon comes out with a new book, it’s cause for celebration. I urge you to have a look at Exoplanets, the newest addition to this writer’s impressive collection.  Like Simon’s previous titles (over 300 of them), this book is a gift. It’s highly readable, making even complex and expansive subjects (like galaxies or the universe itself) both understandable and entertaining. In addition, it’s jam packed with ideas curious people love to explore, such as whether we’re alone in the universe.

Not that long ago, landing on the moon was a big deal. Now we are studying—literally identifying and investigating—so-called exoplanets, meaning planets outside our tiny solar system. What could be more exciting? But wait. Did you read that right? Did I say tiny solar system? Well, let’s put it in author Seymour Simon’s own language—and believe me, the guy has a gift for comparisons. If the Milky Way Galaxy were the size of the USA, he tells us, “Our whole solar system would then be the size of a quarter coin placed on the United States. Meanwhile, the sun would be only a microscopic speck of dust on that scale” (6). How small does that make you feel?

Milky Way 5As humans, we’ve likely pondered the possibility of alien life since we first looked up at the stars. Now we might be close to answering the question meaningfully, making this—from a scientific perspective—one of the most exciting times to be alive. Ever.

Tiny can be powerful. For a small book, Exoplanets has a big reach. In just under 40 pages, Seymour Simon investigates a wide range of provocative questions, some answerable and many meant to tease our imaginations:

• What’s a Goldilocks planet?
• How many stars (suns) and exoplanets might exist just within our own Milky Way?
• What’s a galaxy? And how many galaxies might our universe contain?
• How many exoplanets have been confirmed so far?
• How in the world do scientists discover these new planets?
• Are exoplanets like Earth—or like any planets in our solar system?
• What does a planet need to sustain life?
• How do we calculate the odds of intelligent life elsewhere in the universe?
• Would aliens be like us—or very different?
• Should we look forward to aliens stopping by—or brace ourselves?

If you and your students have ever wondered about these same things, don’t miss this book. The ideas are inherently intriguing and presented with the clarity for which Simon is famous.

Animals Nobody LovesI’m a long-time fan of Seymour Simon’s nonfiction, and have carried his books to countless workshops, sharing them with teachers and students alike—who always madly scribble down titles. Special favorites for me include Big Cats, Animals Nobody Loves, Gorillas, Sharks, Whales, The Brain, The Heart, and Our Solar System, but let me just say that you could read all day and into tomorrow, and still have numerous remarkable Seymour Simon books to explore. As a former teacher, Simon knows how to engage students, how to emphasize important details, how to get conversationally technical without drowning us in hard-to-recall statistics, and above all, how to suggest stimulating questions and issues for us to think about.The Heart

In his striking conclusion, Simon admits there is much we humans still do not know, including whether life beyond our solar system, if it exists at all, might take the form of intelligent beings or simple microbes. “So why are we even looking?” he asks. “We’re looking for answers because that’s what humans do. We are curious about our world and our surroundings” (39). That curiosity, he adds, is like an insatiable thirst.

What a brilliant wrap-up.

Curiosity not only feeds our desire to explore space, but also drives our very desire to learn. Let’s nurture the innate curiosity in our children because it’s what makes our teaching not only effective, but literally possible. One good way to keep curiosity alive is by sharing great nonfiction books like this one.

In the Classroom

Sharing the book aloud. You may find this book appropriate for use with a reading group of students who share an avid interest in space and the possibility of intelligent life in the universe. Still, who can say how many of your students will find this topic intriguing, given just a little taste? With this in mind, I recommend reading at least through page 9 aloud to the whole class, then inviting students to finish the book on their own, with follow-up group discussions. As you read through the book yourself, mark those passages you just “have to share.” I’m predicting you’ll find quite a few!

milky way 3Background. How many of your students have wondered about the possibility of life on other planets? Or wondered how many other planets there might be in the universe—or just within our own Milky Way galaxy? For fun, have students write short paragraphs about this, speculating or offering their current beliefs. After sharing selected passages from the book, talk about whether their ideas have changed—or their beliefs have been reinforced. Share your own thoughts, too–with, of course, the caveat that no one knows the answer to this question. Yet.

Because the book is so clearly written, students do not need a great deal of background information to understand it. However, a grasp of certain concepts will certainly enhance their enjoyment of this topic. In particular, it’s helpful if students are familiar with or knowledgeable about—

• The story of Goldilocks, so they can readily grasp how the “Goldilocks” concept applies in other contexts (It’s easy to assume children are acquainted with these fairy tales with which a lot of us grew up, but many are not, so ask!)
• The basics of our solar system, such as the number of planets, and a sense of which ones are closest to the sun (Think about sharing Seymour Simon’s book Our Solar System as a way of setting the stage for Exoplanets.)
• The terms solar system, Milky Way galaxy, and universe—and distinctions among them
• The concept of a light year, the distance light travels in a year, or 5.88 trillion miles (Make sure students have some idea of what a trillion even is—this can be difficult for young readers, or anyone, to picture!)

Our Solar SystemYou might also wish to ask students how many have seen films or read books that explore the idea of alien life. What forms does that fictional life usually take? Do they feel these portrayals are realistic—or mostly a product of writers’ and film makers’ imaginations?

Questions for Writing or Discussion

Question 1: What does it take to make a planet habitable? This is a good question to research, though your students likely have many ideas about this already. Exoplanets offers numerous clues. See the early discussion of “Goldilocks” planets on page 5, the reference to water vapor on page 13, and the discussion of atmosphere, ocean water, and temperature on page 19. See if you can, with your students, come up with their own personal definition of the “habitable zone.” Note the comment on page 20 that “Each star has a different habitable zone.” Why would this be? What’s the habitable zone for our own star, the sun? What if Earth had been a little closer to the sun—or just a bit farther away?

Cosmos2Note: In his famous book Cosmos, astronomer Carl Sagan wrote this:

The Earth is a place. It is by no means the only place. It is not even a typical place. No planet or star or galaxy can be typical, because the Cosmos is mostly empty. The only typical place is within the vast, cold, universal vacuum, the everlasting night of intergalactic space, a place so strange and desolate that, by comparison, planets and stars and galaxies seem achingly rare and lovely. If we were randomly inserted into the Cosmos, the chance that we would find ourselves on or near a planet would be one in a billion trillion trillion (1033, a one followed by 33 zeroes). In everyday life such odds are called compelling. Worlds are precious. (1980, 5)

Those beautiful lines haunt me still. Worlds are indeed precious. But as we now know, precious does not necessarily mean unique. The idea that intelligent life could exist somewhere in that “everlasting night of intergalactic space” is infinitely captivating.

Question 2: How many exoplanets exist? While we cannot come up with a specific number, we can—as Seymour Simon’s book suggests—make an intelligent guess. What’s important here is understanding how scientists make such estimates.

We need to begin with the notion of how many exoplanets might exist in that tiny bit of galactic real estate known to us, the Milky Way. According to Simon, scientists estimate that there could be one Goldilocks planet circling each red dwarf star in the galaxy—and more such planets circling other stars similar to our sun. Based on the numbers of such stars in the galaxy, the Milky Way itself might contain billions of habitable planets (See page 9 for a thorough discussion). Remember, though: The Milky Way is only one galaxy, so we have to ask . . .

How many galaxies are in the universe? See page 32 for an estimate. Then, as the saying goes, prepare to do the math. You should come up with a pretty dazzling number. If there truly are this many Goldilocks planets scattered throughout the universe, what are the odds that life in some form exists out there somewhere, however distant from us?

Billions and Billions


Note: For an utterly delightful discussion of how to use and multiply cosmic numbers, see Carl Sagan’s book Billions and Billions, pages 3-12. That title is a joke, by the way. Sagan, by his own account, never uttered the expression “billions and billions.” It was made famous by talk show host Johnny Carson, who loved impersonating Sagan.






Question 3: Suppose there were intelligent beings on other planets. If we could reach out to them, what would we want them to know about us? Before students write or talk about this, share the story of Frank Drake’s Arecibo Message, a broadcast sent from Puerto Rico in 1974 (See page 31). Discuss the things Drake included in this message.

Then ask students to think about sending a similar message today. What things would you come up with, as a class, to include—and why? What would best represent life on our planet in the Twenty-First Century?

You may also wish to share Simon’s discussion of Breakthrough Listen, a sophisticated search initiated by physicist Stephen Hawking (see page 32). What is innovative about Breakthrough Listen, and how does it change the exploration game for scientists?

Question 4: Is it likely—or even possible—that alien beings have already visited us on Earth? Many people think so, though evidence is anything but conclusive or even, for that matter, convincing to most scientists. But it’s fun to imagine, which may help explain why so many people feel they’ve been visited by aliens. What do your students think? Research this topic and discuss whether the evidence thus far has credibility. What barriers or conditions minimize the odds of beings traveling through space to visit us here on Earth?

Hey–is anybody listening? As Simon tells us in Exoplanets, we are continually sending signals into space through our radio and television broadcasting. More recently, we’ve begun deliberately attempting to contact anyone who might be listening. So far, we’ve heard nothing back. Why? On page 28, Simon offers several possible reasons. Share these reasons with students and ask what they think. Could someone be listening out there? Do they hope so?

Question 5: Are alien beings friendly? Among the many enticing questions Seymour Simon raises in this book, this one is for me the most tantalizing of all. No matter how curious we might be, we have to face the possibility, as explorers have through time, that we could encounter hostile beings who do not wish us well. Should we keep going anyway? Is it worth the risk? What do your students think?

Ask if they imagine that alien life is more likely to be friendly or unfriendly—and why. Suppose we were to encounter a civilization with intelligent beings far older, wiser, and more technologically sophisticated than any beings here on Earth. Would this be a good thing? What influence might such a discovery have on us, and how could our lives change as a result?

Before you go . . .

Take time to read the Author’s Note at the front of the book. This isn’t a quickly dashed off comment. It’s a message from the heart by an author who loves writing and enjoys telling us about his approach and vision.

Want to know more about exoplanets?

They’re a hot topic on the internet these days. Just type “exoplanets” in your search engine and prepare for a barrage of articles and thrilling photos. In addition, Seymour Simon lists several key websites to explore. See page 40.Milky Way 3

About the Author

The New York Times has called Seymour Simon “the dean of the [children’s science] field.” He has written more than 300 books for young readers, 75 of which have been named Outstanding Science Trade Books for Children by the National Science Teachers Association (NSTA). In 2012, Simon founded StarWalk Kids Media, a streaming eBook platform that makes outstanding literature from today’s top authors available to schools and libraries.

Simon’s website (www.seymoursimon.com) is a Webby Honoree, and was named one of twelve “2012 Great Websites for Kids,” offering children, families, and educators a wide array of free downloadable resources designed to enrich their reading experience. Throughout his incredible career, Simon has won multiple awards for his work, including the prestigious American Association for the Advancement of Science/Subaru Lifetime Achievement Award for his lasting contribution to science education. A visionary and committed educator (He taught for twenty-five years before becoming a full-time writer), Simon never loses sight of his primary goal. “I’m more interested in arousing enthusiasm in kids than I am in teaching the facts,” he says. “The facts may change, but that enthusiasm for exploring the world will remain with them for the rest of their lives.”

Visit Simon at http://www.seymoursimon.com where you can read more about his interests, learn about other publications, follow his daily nature walks in upstate New York, and even post on his blog.

Teaching Nonfiction RevisionAre your students writing their own nonfiction? Let us help!

Teaching Nonfiction Revision (by Sneed B. Collard and Vicki Spandel) will guide you and your students seamlessly through the whole revision process. You’ll find out, step by step, how one of our finest professional writers—Sneed Collard—readies his own drafts  for publication. As Sneed shares his trade secrets, I work alongside him, translating Sneed’s professional strategies into classroom writing activities students will love and learn from, suggesting ways to confer during revision, and sharing writing secrets that demystify revision even for writers who struggle. By the end of the book, you’ll feel like an expert at teaching this vital part of writing process. Don’t miss our list of recommended nonfiction books—for both adults and students (And if you’re wondering, of course Seymour Simon made the list, even though, unfortunately, we didn’t have space to include all 300 titles).

Teaching Nonfiction Revision is available at Amazon or at our publisher’s website, http://www.heinemann.com