The Planetary Report®
The Planetary Defense Issue

June Solstice 2021

Planetary Report June Solistice 2021 Cover

On the Cover: NASA’s DART mission will intentionally crash into the small asteroid Dimorphos in 2022, changing Dimorphos’ orbit around a larger asteroid named Didymos. The mission will demonstrate a technique that could be used if a future asteroid is found on course to hit Earth. Credit: NASA/Johns Hopkins APL
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June Solstice 2021

"Just Nuke 'Em!" Planetary Defense in the Movies

What two famous 1998 asteroid movies got right and wrong.

Risky business: will the world rise to the challenge of asteroid defense?

This November, NASA will launch the world’s first mission to test a method of deflecting an asteroid.

Your Impact: June Solstice 2021

Our annual Day of Action set up virtual meetings between 145 members and their congressional representatives and staffers.

Your Place in Space

Disasters Aren’t Inevitable: Planning Ahead to Protect Our World

By Bill Nye, Planetary Society CEO

Our world is fragile. The COVID-19 pandemic reminds us that we are all in this together on our planet. When trouble started in one part of the world, it quickly touched every one of us.

The analogy from pandemic to asteroid impact is compelling. A major impact anywhere in the world would have enormous consequences. It would affect every single person on Earth, either directly or indirectly. Lives would be lost. Some people would be forced to migrate. Economies would slow or even collapse depending on the impact’s size and location.

If a potentially disastrous incoming object were identified—one that would impact here, say, 20 years hence—would we work together? Would governments cooperate or be paralyzed by mistrust? Would science deniers and contrarians carry the day and prevent significant action? After the catastrophe, would we lend a hand to one another, or would rivalries and inequities be amplified? No matter the eventual outcome, we would once again be painfully reminded that as Earthlings, we are all affected by forces of nature, whatever they may be.

A global pandemic is akin to a massive asteroid impact in yet another way. Both could be prevented if we were to put in enough time, effort, and energy—and if we have the right systems in place. For most of us, contemplating the effects of an asteroid or comet impact often brings to mind apocalyptic images from science fiction, but by studying distant objects that might threaten us, we can indeed prepare for a potential orbital collision. The threat is real, and we are the first generation of humans able to get ready and be set to deflect an incoming asteroid. Fundamentally, it will require investment by governments around the world. Here at The Planetary Society, we’ve been advocating for those investments for many years, and thanks to the support of members like you, we’ve made progress.

If there’s one thing we can learn from the enormous challenges created by the pandemic, it’s that we have to work together to protect our species. Our world is fragile. We aren’t invincible, but when we pool our considerable talents, we humans are a force to be reckoned with. Let’s not let an asteroid prove otherwise.

This issue of The Planetary Report highlights the important things we should all know about the threat of incoming asteroids along with the work we’re doing to defend Earth from such impacts. We also celebrate the impact (pun very much intended) that your membership has already made on planetary defense efforts and share new ways that you can get involved to help defend Earth. Let’s go!

Members on Deck

Our Members Kick Asteroid

By Ellen McSorley, a Planetary Society member and donor from Monmouth County, New Jersey

In February 2013, an asteroid blasted through the air over Chelyabinsk, Russia. Thousands of buildings were damaged, and hundreds of people were injured. I asked myself, “How did this go undetected?”

In 2017, I was reading an article about Bill Nye, CEO of The Planetary Society, and asked my good friend Google, “What’s The Planetary Society?” Searching through the website and reading about different projects in which the Society was involved, I came upon a page about defending Earth from asteroid impacts. “Wow,” I thought, “someone is doing something about this.” Reading further, I discovered that the Society has the Shoemaker NEO (near-Earth object) Grant program to help amateur astronomers find and track potentially dangerous asteroids.

Soon after my discovery, the Society held a fundraiser through Kickstarter for planetary defense. I had the opportunity to be involved in a project that could very well save the world! Asteroid impacts are the one natural disaster about which we can actually do something.

Since then, I’ve been hooked on planetary defense. In 2020, I attended the Day of Action in Washington, D.C., and planetary defense was my favorite talking point. I had the opportunity to educate members of Congress about this important mission.

I’m hoping that at this year’s Day of Action, I can spark interest in the funding of the NEO Surveyor space telescope so that a disaster like the one in Chelyabinsk won’t happen again.

Want to know more? I highly recommend the video series by Dr. Bruce Betts on defending Earth from asteroids, available at Hey, it has dinosaurs! Who could ask for more?

Chelyabinsk Meteor Trail
Chelyabinsk Meteor Trail A resident 200 kilometers (120 miles) north of Chelyabinsk, Russia snapped this photo of the trail left by a meteor that exploded over the city in February 2013.Image: Alex Alishevskikh

Get Involved

The Threat Is Real. The Answer Is Science... Powered By YOU.

Last September, Brazilian amateur astronomer Leonardo Amaral discovered a kilometer-wide, near-Earth asteroid that would create global devastation if it hit our home planet. Thankfully, the asteroid QU6 was of no risk to us due to its distance from Earth.

But the fact that a near-Earth object (NEO) large enough to destroy a major city had gone undetected until Leonardo’s discovery proves we must work urgently to defend Earth from deadly asteroids! This is where you come in...

Thanks to funding from members like you, Leonardo received a Shoemaker NEO grant from The Planetary Society in 2019 for a new telescope mount that allows him to observe dimmer objects.

His work underscores the immense value of our grants, given every two years to fund equipment upgrades for passionate astronomers who spend countless hours working to find, track, and characterize near-Earth objects.

Will you please power this important work with your contribution? Act now and your gift will be matched dollar for dollar up to a total of $25,000!


Observatório Campo dos Amarais (OCA)
Observatório Campo dos Amarais (OCA) A 2019 Planetary Society Shoemaker NEO Grant will help Observatório Campo dos Amarais (OCA) in Brazil study near-Earth asteroids in the very southern skies that are not seen by the current major asteroid survey telescopes.Image: Leonardo Scanferla Amaral

How Can I Help Defend the Planet?


U.S. residents can sign a petition to Congress advocating for the NEO Surveyor mission to rapidly detect and characterize hazardous near-Earth objects. Find the petition at


Help raise awareness about the asteroid threat by giving a presentation to a local astronomy club, student group, or even just your friends and family. Check out our planetary defense presentation kit at


Brush up on asteroid impacts and how to prevent them with our free Asteroid Defense 101 course at

Celebrate Asteroid Day With Us!

June 30 is Asteroid Day, a UN-sanctioned global awareness campaign that takes place every year on the anniversary of the Tunguska event in 1908, the most harmful known asteroid-related event in Earth’s recent history. Asteroid Day’s mission is to inspire, engage, and educate the public about asteroid opportunities and risks. The Planetary Society is a proud partner and is helping to develop Asteroid Day LIVE, a free live broadcast that mixes education and entertainment. Go to to learn more and tune in on June 30 to join the celebration.

Make Your Mark on The Planetary Society

There are so many ways to honor your heroes and loved ones. As a Planetary Society member, we invite you to do so while also supporting our mission to advance space science and exploration. By buying a custom-inscribed brick that paves the front of our headquarters in Pasadena, California, you can leave a permanent mark on the future of our organization while helping us achieve our mission. Learn more at

Bringing the Cosmos to You Every Week

If you aren’t already subscribed to our weekly email newsletter, The Downlink, sign up today! Every Friday, we send you the latest space news, amazing space images, inspiring artwork, updates on The Planetary Society’s work, and ways that you can get involved. There’s no better way to stay connected to our global community of space advocates. Sign up at

What's Up?

A Supermoon and Meteor Shower

By Bruce Betts, Planetary Society Chief Scientist

On June 24, look for a supermoon, which is when the Moon looks extra large and bright. This happens whenever the Moon is on the opposite side of Earth from the Sun, fully illuminating its face while closest to Earth in its elliptical orbit. Reddish Mars will be sinking lower in the west soon after sunset through June and July. Super-bright Venus will be low in the west soon after sunset through September. Venus and Mars grow closer in the sky until July 12/13, when they will be as close as the width of a full Moon (about half a degree). Bright Jupiter and yellowish Saturn are in the same region of the sky, rising in the east in the late evening in June and the early evening by September. The Perseid meteor shower peaks August 12/13, with increased activity several days before and after. The most meteors will occur after midnight, and the Moon will have set by then, leaving a darker sky. For more night sky tips, you can always check out

Random Space Fact

The Moon, with a diameter of 3,474 kilometers (2,159 miles), is larger than each of the dwarf planets, the largest being Pluto, with a diameter of 2,377 kilometers (1,477 miles).

Trivia Contest

Our December solstice contest winner is Jim Derivera of Oxnard, California. Congratulations! The question was: What was the only Apollo spacecraft call sign named after a single star? The answer: The Apollo 14 Lunar Module call sign was Antares, named after the star that would be used to orient the Lunar Module during landing.

Try to win a copy of Astronomy for Kids by Bruce Betts and a Planetary Radio T-shirt by answering this question: What is the largest asteroid considered to be a near-Earth object (NEO)?

Email your answer to [email protected] or mail your answer to The Planetary Report, 60 S. Los Robles Ave., Pasadena, CA 91101. Make sure you include the answer and your name, mailing address, and email address (if you have one). By entering this contest, you are authorizing The Planetary Report to publish your name and hometown. Submissions must be received by September 1, 2021. The winner will be chosen in a random drawing from among all the correct entries received.

For a weekly dose of “What’s Up?” complete with humor, a weekly trivia contest, and a range of significant space and science-fiction guests, listen to Planetary Radio at

Astronomical Art

William Hartmann, View of the 1908 Tunguska Fireball From the Town of Kirensk

The View from Kirensk
View of the 1908 Tunguska Fireball From the Town of Kirensk William HartmannImage: William Hartmann

On the morning of June 30, 1908, an asteroid roughly 50 to 80 meters wide (160 to 260 feet wide) exploded above Tunguska, Siberia, leveling 2,000 square kilometers (770 square miles) of forest. No known pictures of the moment of impact exist, but Russian scientists collected eyewitness accounts from people up to hundreds of kilometers away.

William Hartmann, a planetary scientist and prolific space artist, used these reports to paint reenactments of the event from different distances and perspectives. Here, a schoolteacher in Kirensk, which is 400 kilometers (250 miles) southeast of ground zero, shields her eyes while watching the meteorite just seconds before it explodes.

Do you want to see your artwork here? We love to feature our members throughout this magazine. Send your original, space-related artwork to [email protected].

The Planetary Report • June Solstice 2021

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