The conventional wisdom of space exploration suggests that robotic probes are both more scientifically efficient and cost effective. Not so, argues a professor of planetary science.
Astronaut Edwin E. Aldrin Jr., lunar module pilot, poses beside the deployed flag of the United States during the Apollo XI moon landing July 20, 1969. [Reuters]
When the Space Shuttle Atlantis rolled to a stop in July 2011, NASA bid farewell to the nation's symbol of manned spaceflight. The Obama administration has scrapped NASA's plan to return humans to the Moon by 2020, which was behind schedule because of technical and budgetary problems. As financial constraints threaten the possibility of future ventures into outer space, many in the astronomical community are advocating for the increased use of unmanned robotic
space, arguing that they will serve as more efficient explorers of planetary surfaces
than astronauts. The next giant leap, then, will be taken with robotic feet.
At the core of Crawford's argument is that human beings are much better at performing the type of geological fieldwork that makes planetary exploration scientifically valuable: they're faster and significantly more versatile than even the most advanced autonomous probes. "People who argue for robotic exploration argue for more artificial intelligence, the capacity for robots to make more complex decisions that somehow leads to increased efficiency," explains Crawford. "But one of the things that make them cheap is miniaturization.You can make robots more intelligent and efficient to a certain point, but they wont get smaller and therefore cheaper." With miniaturization, he explains, comes a depletion in the number of scientific instruments a probe can carry, the number of samples it can collect, and its ability to cover more ground. " [Mars rovers] Spirit and Opportunity are fantastic things on Mars, but the fact that they've traveled as far in eight years as the Apollo astronauts traveled in three days speaks volumes." At a certain point, the costs of developing 'smarter' (but not better equipped) autonomous rovers will exceed the meager gains in scientific collection and outstrip existing scientific budgets.
The advantages of human over robot explorers are recognized in the planetary sciences community: a 2005 report by the Commission on the Scientific Case for Human Space Exploration noted that "the expert evidence we have heard strongly suggests that the use of autonomous robots alone will very significantly limit what can be learned about our nearest potentially habitable planet." Steve Squyres, the Principal Investigator for the Mars Exploration Rovers Spirit and Opportunity, conceded in his book Roving Mars that "[t]he unfortunate truth is that most things our rovers can do in a perfect sol [a martian day] a human explorer could do in less than a minute." But Crawford also expresses concerns over the capacity of robots for "making serendipitous discoveries."
"We may be able to make robots smarter, but they'll never get tot he point where they can make on the spot decisions in the field, where they can recognize things for being important even if you don't expect them or anticipate them," argues Crawford. "You can't necessarily program a robot to recognize things out of the blue."
The other downside of a shift towards robotic exploration is the decline of samples, the real meat of the planetary sciences. Robotic expeditions have always been one-way trips: the probes go, land, take readings, and don't come back. But the collection and prolonged study of planetary samples are real drivers of scientific knowledge, which Crawford measures in terms of published scientific literature:
Several things are immediately apparent from Figure 2. Most obvious is the sheer
volume of Apollo's scientific legacy compared to the other missions illustrated. This
alone goes a long way to vindicate the points made above about human versus robotic
efficiency. The second point to note is that the next most productive set of missions
are the lunar sample return missions Lunas 16, 20 and 24, which highlights the
importance of sample return. Indeed, a large part of the reason why Apollo has
resulted in many more publications than the Luna missions is due to the much larger
quantity and diversity of the returned samples which, as we have seen, will always be
greater in the context of human missions. The third point to note is that, despite being
based on data obtained and samples collected over 40 years ago, and unlike the Luna,
Lunokhod, or Surveyor publications, which have clearly levelled off, the Apollo
publication rate is still rising. Indeed, it is actually rising as fast as, or faster than, the
publications rate derived from the Mars Exploration Rovers, despite the fact that data
derived from the latter are much more recent. No matter how far one extrapolates into
the future, it is clear that the volume of scientific activity generated by the MERs, or
other robotic exploration missions, will never approach that due to Apollo.
"We're still benefiting from the scientific legacy of those few soil samples brought by the Apollo mission, but we can only do this because we went to the Moon, got these samples, and came back," says Crawford. "If we sent a rover to Mars along with a return vehicle, that would enormously increase its scientific impact, but that's hasn't been implemented yet because its still incredibly expensive. If a mission goes to Mars, lands in one place, bring back half a kilogram of Mars rocks, it will be immensely valuable, but compared to Apollo, which not only visited six sites (and many hundred of sites with the help of the lunar rover) but came back with 382 kilograms of lunar material, it sort of pales in comparison."
While robotic probes find a permanent home on a planetary surface, sending manned expeditions inherently means planning for a return trip. Would a manned trip to Mars, replete with a sample-laden return vehicle, yield a similar explosion in scientific literature? Crawford thinks so. "A Martian expedition would be 5 or 10 times more expensive than Apollo in real terms, but not so much more expensive that it would negate the added benefit of being able to collect samples. They'll bring back a much larger quantity and diversity of samples than a robotic mission, and this is especially important with regards to Mars: there are reasons for wanting more lunar samples, but Mars is a much bigger and much more geologically diverse planet, with a much more complicated geology so much more inconceivably complicated history than the Moon, we won't get a full sense of its history or evolution just by scraping around on the surface with these smalls robot probes."
The scientific impact of these moon rocks is compelling: our whole
chronology of the solar system is built on the radiometric dating of the
Apollo samples. "The top scientific benefit is that it's been possible
to date areas of the lunar surface. We have this curve that plots crater density versus age, which we can use to get an estimated age of
virtually anywhere else in the Solar System," explains Crawford.
"The last major eruption of Olympus Mons [on Mars] was 400 million years
ago, and the only way we have this measurement is because of Apollo
So why, then, are scientists resigned to sending probes and rovers to the corners of the galaxy? Scientists, argues Crawford, tend to look at the enormous costs for Apollo, which nobody will ever be able to afford again, as an artificial baseline for gradual streamlining of space exploration. This is the wrong approach to take "There's lots of collective amnesia as to how efficient Apollo really was, which is really the only example of exploring the surface of another planet," explains Crawford. "An enormous amount was achieved in a very short total contact time with the lunar surface."
Planners feel the microscopic formations in Mars meteorite ALH84001, found in Antarctica, and the highly diverse samples of rocks believed to have been strewn about by ancient rivers seen at the Mars Pathfinder landing site, provide a strong motive for sending human exobiologists and geologists to the Red Planet. [Pat Rawlings/NASA]
But Crawford recognizes that, despite its benefits for scientific research, manned missions are subject to domestic forces and rarely undertaken for the sake of science alone. The United States was willing to shoulder the enormous costs of the Apollo mission because of the geopolitical and economic interests (namely, besting the Soviet Union), an argument advanced most recently by science communicator Neil DeGrasse Tyson.
"Science was the beneficiary of a human spaceflight mission that was undertaken for geopolitical purposes," explains Crawford. "The total costs is large, but the best way for scientists to look at it is not 'this is a science function.' They need to look at Apollo as the confluence of geopolitical, industrial, and social factors. You need all of these things to spend the money necessary."
Crawford's theory, then, is not necessarily targeted towards the general public: he recognizes the difficulty of justifying an expensive manned mission with no immediate economic benefit (although he notes notes that the 1987 NASA procurement of $8.6 billion generated a turnover of $17.8 billion and created 209,000 private sector jobs, according to an article in Nature), especially in the throes of an global economic downturn. His main argument, then is those scientists consigning themselves to a future of interstellar probes are shooting themselves in the foot. Ventures like the James Webb Space Telescope may hit the ceiling for government expenditures on purely scientific ventures, but researchers and scientists can -- and should -- try to make the case for manned spaceflight in other contexts, if only for the sake of maximizing the scientific gains made from planetary exploration.
"Humans bring a net benefit to space exploration that, in my opinion, outweighs the costs," says Crawford. "But people need to realize that the overall case for manned spaceflight is multifaceted, a totality woven out of these different strands, of which science is one. Industry, innovation, inspirational value -- all of these factors must be addressed before manned spaceflight can return."
The comparatively less flashy, less spirited former First Kid managed to show her mom’s softer side at the DNC on Thursday.
Yes, yes, yes. Chelsea Clinton is not the most charismatic orator—as the Twittersphere was happy to point out during her brief address on Thursday night. She is like her mother that way. There’s something not quite natural about her self-presentation. She’s not stilted, exactly. But she can come across as too cautious, too reserved, too conscious of other people’s eyes upon her.
But, let’s face it, as the lead-in to Hillary’s big nominating speech, a little bit of boring was called for. Unlike some of this convention’s high-wattage speakers, there was zero chance Chelsea was going to upstage Hillary with a barnburner or tear-jerker. Chelsea wasn’t there to pump up the crowd. Her role was to comfort, to explain, to cajole, with an eye toward giving Americans a glimpse of her mother’s softer side.
The father of a Muslim American who died in Iraq confronts Donald Trump.
Khizr Khan began his speech at the Democratic National Convention on Thursday with words I wish he didn’t have to say: “Tonight we are honored to stand here as parents of Captain Humayun Khan and as patriotic American Muslims—as patriotic American Muslims with undivided loyalty to our country.”
I wish he and his wife didn’t have to stand there as the parents of a 27-year-old Army captain who was killed by suicide bombers while serving in the Iraq War. And I wish Khizr Khan hadn’t felt the need to declare his patriotism and loyalty to the United States of America. Those truths should have been self-evident.
The state of the union is not strong when an American feels compelled to clarify such things. In better times, Khizr Khan, who was born in Pakistan and moved to America from the United Arab Emirates, might have begun his speech with what he said next: “Like many immigrants, we came to this country empty-handed. We believed in American democracy—that with hard work and [the] goodness of this country, we could share in and contribute to its blessings.”
In her acceptance speech, the Democratic nominee took on her Republican rival by throwing Donald Trump’s own words back at him.
The unicorn of American politics, the “real Hillary Clinton”—the Hillary Clinton I’ve known for nearly 30 years—that Hillary Clinton likes to wear low-heeled shoes to a butt-kicking.
“A man you can bait with a tweet is not a man we can trust with nuclear weapons,” she said of her Republican rival, Donald Trump, while accepting the Democratic presidential nomination, the first woman in U.S. history to head a major-party ticket.
It was a sound bite for the ages, searing and on point.
“Do you really think Donald Trump has the temperament to be commander in chief?” she continued. “Donald Trump can’t even handle the rough and tumble of a presidential campaign. He loses his cool at the slightest provocation. Imagine, if you dare, imagine him in the Oval Office facing a crisis.”
Psychologists have long debated how flexible someone’s “true” self is.
Almost everyone has something they want to change about their personality. In 2014, a study that traced people’s goals for personality change found that the vast majority of its subjects wanted to be more extraverted, agreeable, emotionally stable, and open to new experiences. A whopping 97 percent said they wished they were more conscientious.
These desires appeared to be rooted in dissatisfaction. People wanted to become more extraverted if they weren’t happy with their sex lives, hobbies, or friendships. They wanted to become more conscientious if they were displeased with their finances or schoolwork. The findings reflect the social psychologist Roy Baumeister’s notion of “crystallization of discontent”: Once people begin to recognize larger patterns of shortcomings in their lives, he contends, they may reshuffle their core values and priorities to justify improving things.
Chris Morris’s brutal satire aired its last and most controversial episode in 2001, but its skewering of the news media feels more relevant than ever.
A sex offender is thrown in the stocks, presented with a small child, and asked if he wants to molest him. A mob of protestors is thrown a “dummy full of guts” that is stomped to pieces within seconds. A radio host insists that pedophiles have “more genes in common with crabs” than the rest of humanity, insisting, “There’s no real evidence for [that], but it is scientific fact.”
It’s hard to pinpoint the most cringe-inducing moment on “Paedogeddon,” a special episode of the British TV satire Brass Eye. But 15 years after the episode aired, it remains a totemic, terrifying satirical vision. Few comedies since have dared to cross the boundaries of taste with such impunity.
“Paedogeddon” aired in the U.K. in the summer of 2001, a year after the murder of a young girl had sparked national hysteria over the country’s sex-offender registry. Britain’s most-read newspaper led a campaign to publish the names and locations of all 110,000 convicted sex offenders, prompting a riot in which an angry mob ransacked the home of an ex-con. Brass Eye, a parody of a 60 Minutes-like newsmagazine show, had been dormant after airing one season in the UK in 1997. But it returned four years later for this surprise broadcast, one that saw its furious (fictional) anchors barking from a dark studio about the plague of seemingly super-powered child molesters stalking the nation, holding a funhouse mirror up to the climate of paranoia and fear that had built up around the country. It was a bold, wildly insensitive piece of comedy, but one that captured the growing madness of the 24-hour news media and foreshadowed some uglier aspects of its future.
The Democratic nominee for United States president made a play for progressives, moderates, and Independents alike during her address in Philadelphia on Thursday night.
“America's strength doesn't come from lashing out,” Hillary Clinton said Thursday, delivering a harsh rebuke to Donald Trump as she accepted the Democratic nomination for U.S. president.
Clinton’s speech capped the Democratic National Convention in Philadelphia, where she made history as the first female presidential nominee of a major party. While Clinton did not skip over the historic aspect of her nomination, she spent most of her hour-long speech emphasizing two, interlocking themes: the importance of community and togetherness, and the fundamental unfitness of the Republican nominee for office. It was not so dark and ominous a speech as Trump’s own acceptance speech a week ago in Cleveland, but it was a negative speech: a warning against the danger posed to America by a Trump presidency.
Narcissism, disagreeableness, grandiosity—a psychologist investigates how Trump’s extraordinary personality might shape his possible presidency.
In 2006, Donald Trump made plans to purchase the Menie Estate, near Aberdeen, Scotland, aiming to convert the dunes and grassland into a luxury golf resort. He and the estate’s owner, Tom Griffin, sat down to discuss the transaction at the Cock & Bull restaurant. Griffin recalls that Trump was a hard-nosed negotiator, reluctant to give in on even the tiniest details. But, as Michael D’Antonio writes in his recent biography of Trump, Never Enough, Griffin’s most vivid recollection of the evening pertains to the theatrics. It was as if the golden-haired guest sitting across the table were an actor playing a part on the London stage.
“It was Donald Trump playing Donald Trump,” Griffin observed. There was something unreal about it.
The Fox host’s insistence that black laborers building the White House were “well-fed and had decent lodgings” fits in a long history of insisting the “peculiar institution” wasn’t so bad.
In her widely lauded speech at the Democratic National Convention on Monday, Michelle Obama reflected on the remarkable fact of her African American family living in the executive mansion. “I wake up every morning in a house that was built by slaves. And I watch my daughters, two beautiful, intelligent, black young women, playing with their dogs on the White House lawn,” she said.
On Tuesday, Fox News host Bill O’Reilly discussed the moment in his Tip of the Day. In a moment first noticed by the liberal press-tracking group Media Matters, O’Reilly said this:
As we mentioned, Talking Points Memo, Michelle Obama referenced slaves building the White House in referring to the evolution of America in a positive way. It was a positive comment. The history behind her remark is fascinating. George Washington selected the site in 1791, and as president laid the cornerstone in 1792. Washington was then running the country out of Philadelphia.
Slaves did participate in the construction of the White House. Records show about 400 payments made to slave masters between 1795 and 1801. In addition, free blacks, whites, and immigrants also worked on the massive building. There were no illegal immigrants at that time. If you could make it here, you could stay here.
In 1800, President John Adams took up residence in what was then called the Executive Mansion. It was only later on they named it the White House. But Adams was in there with Abigail, and they were still hammering nails, the construction was still going on.
Slaves that worked there were well-fed and had decent lodgings provided by the government, which stopped hiring slave labor in 1802. However, the feds did not forbid subcontractors from using slave labor. So, Michelle Obama is essentially correct in citing slaves as builders of the White House, but there were others working as well. Got it all? There will be a quiz.
Hillary Clinton accepted the Democratic nomination in Philadelphia, ratifying a promise made there 240 years before—that all are created equal.
PHILADELPHIA—“Daddy,” my daughter recently asked me, “Why are there no girl presidents? Is it because boys are stronger than girls? Because they’re smarter?”
It left me speechless.
On Thursday night, in the city where the Founders declared all men created equal, I found my answer. It’s because no major party has ever tried nominating one before.
“Tonight, we’ve reached a milestone in our nation’s march toward a more perfect union: the first time that a major party has nominated a woman for president,” Clinton said as she accepted the nomination. “Standing here as my mother’s daughter, and my daughter’s mother, I’m so happy this day has come.”
It wasn’t the theme of her speech. But it was the unspoken subtext that ran through it. And Clinton took pains to frame the achievement not as the triumph of some subset of Americans, but as a victory for all Americans. She proclaimed herself both “happy for grandmothers and little girls,” but also “happy for boys and men—because when any barrier falls in America, it clears the way for everyone.”
The State Department is reopening its investigation into Hillary Clinton’s emails, just as she puts a Justice Department investigation behind her.
Hillary Clinton is out of the frying pan and into the fire. On July 6, Attorney General Loretta Lynch announced that the Justice Department would not pursue criminal charges against the presumptive Democratic presidential nominee for her use of a private email server at the State Department. But the following day, with that criminal investigation closed, the State Department reopened its own probe into the emails, the AP reported.
State Department spokesman John Kirby told the AP that it would be looking at potential mishandling of classified information by Hillary Clinton and her top aides. Former officials could face administrative sanctions, including a loss of their security clearances—a step that would be both politically embarrassing for Clinton, and complicate efforts to staff a national-security team should she prevail in November.