Science

NASA’s DART mission will move an asteroid and change our relationship with the solar system

The dinosaurs had no space agency; maybe if they did they would still be here, would-be planetary defenders sometimes joke about their quest to avoid an asteroid impact.

Planetary defense aims to identify any asteroids on the way that cause serious damage to Earth and, should such a threat arise, act to deflect the rock. Such an impact is the only natural disaster we can prevent, planetary defense experts often say.

But planning an asteroid deflection would be difficult today, given several outstanding questions about how effective a maneuver would be in the real world. So next year, planetary defense will take a big step, conducting its first experiment to determine how such a deflection might actually play out thanks to NASA’s Double Asteroid Redirection Test, or DART, which will launch in late this month.

Related: If an asteroid really threatened Earth, what would a planetary defense mission look like?

In late September or early October 2022, the 550 kilogram (1,210 pound) DART spacecraft will crash into an asteroid called Dimorphos. Scientists will be watching with enthusiasm, measuring how much the impact of the space rock’s orbit around its larger companion, Didymos, accelerates the first real data on what it could really require to deflect a threatening asteroid from the path of Earth.

It’s just a stone, just a little change. Just to reduce the chances of humans going the way of the dinosaurs. But the impact of DART will also mark a new relationship between humans and the solar system we live in, a milestone perhaps worth contemplating.

A matter of scale

Over the decades, humanity has left footprints on the moon, rover tracks on Mars, a cloud of metals in the atmospheres of Jupiter and Saturn, silent robots scattered from the sun to beyond the edge of its influence. But until now, orbital mechanics have been free of human fingerprints, orchestrated only by gravity, chance, and the bones of the solar system. It was never quiet, of course, but it was chaotic in exactly the same way that it always had been.

The DART impact will be the first human fingerprint in this eternal dance of the solar system, an almost imperceptibly tiny but nonetheless a fingerprint, the first time that a coalition of humans has come together to deliberately take advantage of any part of the maelstrom. that surrounds us.

“Humans are like: we can do anything in the solar system, we can even move things out of the way,” Ellie Armstrong, an outer space geographer at the University of Delaware, told Space.com.

A footprint left on the moon during NASA’s Apollo program. (Image credit: NASA)

“Intervening in the dynamics of small bodies is a big problem,” Valerie Olson, an anthropologist at the University of California at Irvine who has studied the planetary defense community, told Space.com. Early advocates of planetary defense recognized that such a mission at its core redesigned the solar system, he noted.

To be clear, the experts suggesting looking at the big picture of the DART mission are not necessarily saying that planetary defense should be abandoned, just that it is an effort worth thinking about from multiple perspectives and in multiple contexts, rather than Let a narrative of what it means to save the planet dominate the conversation.

“Is it important that we find out whether or not we can deflect an asteroid in the event of an emergency situation? Yes,” Natalie Treviño, a freelance critical theorist who focuses on space, told Space.com. “But we are seeing our own planet literally and metaphorically on fire.”

Treviño compared the deflection of an asteroid to the damming of a river on Earth as an action that could benefit humans but has broader consequences on the environment. “What is our responsibility to our solar system?” Treviño said. “Do we, as human beings, have the right to make these massive changes to the solar system? But also, what precedent does it set?”

However, considering rearranging the solar system requires not only looking ahead, but also looking back to assess what human stories may influence such action, and whether we want to create a new and different shape.

“Even the idea of ​​being able to move and exploit and destroy or change natural capital like rocks and asteroids is fundamentally anchored in an imperial worldview that humans can do whatever they want,” Armstrong said.

Who is in the room?

If we humans like to meddle, where is the line between endearing curiosity and something more serious? That line may depend not only on the scale of the effect on orbital dynamics, but also on who is making the decisions about a planetary defense project.

The three experts noted that while the worst impact scenario could destroy regionally and have global consequences, only a handful of nations have the space capability to contemplate embarking on a planetary defense mission. One challenge that the planetary defense community often considers is how to ensure that nations that do not have space travel have a voice in how Earth responds to the threat of an asteroid.

“Very particular people in private agencies are the ones who make decisions about how to intervene in the most natural and least social space, which is outer space.” Olson said. “What responsibility do these groups have to negotiate in an inclusive way the defense and protection of all people, of the planet in general?”

An artist's rendering of ESA's Hera mission studying the crater left by DART.

An artist’s rendering of ESA’s Hera mission studying the crater left by DART. (Image credit: ESA–ScienceOffice.org)

The DART mission specifically includes some international collaboration, as it stems primarily from a years-long discussion between NASA and the European Space Agency (ESA). The pair of agencies initially explored a joint mission; The DART mission, as it will eventually launch, includes a cubesat contributed by Italy and will be followed by an ESA mission called Hera that will closely assess the wreckage later this decade.

But the mission may have gone unnoticed, even among the nations whose agencies are involved. “The majority of the public, be it an American public or the world at large, is not particularly aware of this mission,” Treviño said. “Nobody came out and said, ‘Hey crowd, hey world, what do you think of this idea?'”

Treviño and his colleagues fear that this lack of public participation in a mission of this consequence could reproduce past and ongoing situations in which some of the most powerful people have made decisions for others on Earth in demonstrations of colonialism, imperialism and militarism. “Something that I find really interesting about this is the national savior kind of narrative, this very imperialistic narrative of being able to save the world,” Armstrong said.

And, of course, planetary defense technology could be abused, like all other technologies ever developed. “The same technologies that can be used to move something can be used to put something together,” Olson said.

Flip planetary defense, for example. Treviño painted a nightmare scenario in which a group could hold an asteroid hostage and it loomed over other communities. “I hate to be the naysayer, the killjoy, but to say, ‘Okay, we can move something in the solar system just to see if we can do it,’ where does that end up going and what are the ramifications? “Treviño said.

DART is a carefully designed mission, and its objective was chosen in part because scientists see no way that the mission could knock down rocks on a collision course with Earth. But for a real planetary defense mission, if something goes wrong, the results can be really disappointing, turning a natural disaster into a social one rather than preventing anything, Olson said.

“This is a step-by-step process, and the step that calls itself a practice step where nothing can go wrong is just a step toward the next step,” Olson said.

One threat among many

Perhaps the strongest concern comes down to how governments, agencies, and the public prioritize different disasters. The framing and scope of the DART mission suggest a recognition of today’s threats that is not universal, no matter how the future turns out.

“Much of the rhetoric surrounding this project is about how this is one of the biggest problems the Earth could face,” Armstrong said, contrasting the decision for a planetary defense strategy with the failed attempts in the United States and elsewhere. abroad to tackle, say, the climate crisis.

At $ 330 million, the DART mission is not a budget buster. The annual budget for NASA’s Earth Sciences Division is around $ 2 billion. But the language of that department speaks of monitoring a changing planet, making a difference in people’s lives, and giving lawmakers the knowledge to make informed decisions. It’s a long way from deflecting an asteroid to defend the planet, even as biologists say a sixth mass extinction is underway, driven primarily by human activity.

“I’m interested in what this says about what kinds of problems you want the United States to see as solving or what NASA wants to see as solving,” Armstrong said. “It is literally moving an entire asteroid and it is not making similar innovations in technology for very real problems.”

The fall of the dinosaurs, cinematic as it was, is just one of five mass extinctions that paleontologists have recorded in the fossil record. Although asteroid impacts are also possible triggers for some of these other mass extinctions, space rocks are certainly not responsible for all of these revolutionary periods of upheaval in what it means to be alive on Earth.

Even when asteroids are involved, an impact is just the trigger. The global killer in an asteroid impact isn’t necessarily the rock itself – the rapid extreme weather changes that follow can be far more brutal. And climate turmoil can occur without an asteroid in the picture, as we, of all beings, know firsthand.

Email Meghan Bartels at mbartels@ or follow her on Twitter @meghanbartels. Follow us on Twitter @Spacedotcom and on Facebook.

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