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45 years ago, Carl Sagan debunked astrology in 2 minutes using twins and a newspaper

“Astrology suggests a dangerous fatalism.”

via Physics and Philosophy/YouTube

Carl Sagan on astrology.

Astrology is the pseudoscientific study of the patterns in the stars and their alleged influence over individuals and history. It has existed as long as humans first gazed into the night sky, and it continues to fascinate people to this day. Currently, it's experiencing a renaissance with younger people after becoming a popular topic on social media.

“There’s some indication that cave art shows this idea that animals and things can be imbued with some kind of spirit form that then has an influence on you, and if you appease that spirit form, then you will have a successful hunt. That was taken over by the idea of divination, where you can actually look at things in nature and study them carefully, such as tea-leaf reading,” astronomer Sten Odenwald told Time.

 astroloical chart, astrological sign, astrology, libra, stars, planets, dice An astrological chart and divination dice.via Canva/Photos

Even though humanity’s understanding of the cosmos has made astrology appear rather crude and outdated, some people still swear by the power of Mercury in retrograde or the return of Saturn to determine the course of their lives. A recent YouGov poll found that 27% of Americans, including 37% of those under 30, believe that the position of the stars and planets influences their lives.

Although there’s something magical about having one's fate intertwined with the movement of celestial objects, it’s not a very logical way to go through life. In fact, Carl Sagan quickly disproved astrology in a 1980 episode of Cosmos: A Personal Journey. Sagan, the “Showman of Science,” is one of the world's greatest science communicators. At the time, Cosmos was seen by over 500 million people, making it the most-watched show in public television history.

  - YouTube  www.youtube.com  

Carl Sagan believed that astrology is dangerous.

“[Astrology] seems to lend a cosmic significance to the routine of our daily lives. It pretends to satisfy our longing to feel personally connected with the universe. Astrology suggests a dangerous fatalism. If our lives are controlled by a set of traffic signals in the sky. Why try to change anything?” Sagan asked.

How to disprove astrology

Sagan used two simple methods to disprove astrology. The first was by looking at competing astrological forecasts in two newspapers, the New York Post and the New York Daily News. The Post's forecast for Libra said that “compromise will help ease tension.” However, the forecast for Libra in the Daily News suggests the opposite: “Demand more of yourself.”

“It's interesting that these predictions are not predictions, they tell you what to do, they don't say what's going to happen,” Sagan said. “They're consciously designed to be so vague that it could apply to anybody, and they disagree with each other.”

Sagan shot more holes into astrology by noting that if he had a twin, born on the same day, nearly at the same time, with the exact same astrological sign, they could have very different destinies. In the case of twins, one may die at a very young age from a horseback accident, while another may live a long and prosperous life. Therefore, the astrological forecast would have to be incorrect for one of them. "If astrology were valid, how could we have such profoundly different fates?" Sagan asks.

 carl saga, nasa, carl sagan moon, moon lander, moon mission, astronomy Carl Sagan with NASA technology.via NASA/Wikimedia Commons

Ultimately, Sagan believes that looking towards the planets to find out where our lives are headed is a shallow way of connecting with the universe when our real connection goes right to the core of our being. “The desire to be connected with the cosmos reflects a profound reality, for we are connected not in the trivial ways that the pseudoscience of astrology promises but in the deep ways,” Sagan said. But what is this deeper connection Sagan is alluding to? He has shown that humans are made of the most incredible substance in the cosmos: starstuff.

“The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff,” Sagan famously said.

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In his last interview, Carl Sagan warned that America will be taken over by a 'charlatan' political leader

Sagan never would have believed in a fortune tellers but dang this is prescient.

via PBS

Astronomer Carl Sagan was the original host of "Cosmos" back in 1980 and it became most watched show in public television history. Few science communicators have been able to match his talent for stoking wonder about the universe.

Shortly before his death in 1996, he appeared on "Charlie Rose" and made a dire warning about how the average Americans' lack of skeptical, scientific thinking could lead to disastrous consequences.

Today, we can see the problems that are happening due to America's anti-science streak whether it's anti-vaxxers, conspiracy theories or climate change deniers.

Sagan was right, America will suffer due to a lack a lack of scientific skepticism.


Carl Sagan and Government_ Charlie Rose.wmvwww.youtube.com


"We've arranged a society on science and technology in which nobody understands anything about science and technology, and this combustible mixture of ignorance and power sooner or later is going to blow up in our faces," he told Rose. "I mean, who is running the science and technology in a democracy if the people don't know anything about it?"

He then warned that our lack of critical thinking leaves us vulnerable to those who wish to exploit our ignorance.

"Science is more than a body of knowledge, it's a way of thinking," he says. "If we are not able to ask skeptical questions to interrogate those who tell us something is true to be skeptical of those in authority, then we're up for grabs for the next charlatan political or religious who comes ambling along."

Sagan believes that a democracy cannot function without an educated populace.

"It's a thing that Jefferson lay great stress on. It wasn't enough, he said, to enshrine some rights in the Constitution and the Bill or Rights, the people had to be educated and they have to practice their skepticism and their education," he says. "Otherwise, we don't run the government, the government runs us."


This article originally appeared five years ago.

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Can't comprehend the 4th dimension? Carl Sagan explains it with an apple in this classic clip.

Sagan was a master science communicator.

via Carl Sagan Planetary Society/Wikimedia Commons and John Finkelstein/Pexels

Carl Sagan and a sliced apple

The concept of the fourth dimension seems beyond human comprehension. As three-dimensional beings, we are unable to see beyond a physical object's height, width and depth. What else could there be?

Enter Carl Sagan, revered as one of the greatest science communicators of his time. He possessed a unique gift for demystifying complex scientific concepts, making them accessible and thrilling for the general public. In 1980, on Episode 10 of the groundbreaking PBS show “Cosmos,” Sagan embarked on a mission to explain the seemingly impossible fourth dimension.

What’s excellent about Sagan’s explanation is that he uses simple and relatable objects: an apple and a Tesseract, or a hypercube.

Sagan began by discussing how a two-dimensional being living in a flat world would perceive a three-dimensional object like an apple.

“Imagine we live in this ‘flatland’/2-D plane with no concept of ‘up’ or ‘down.’ Then along comes a 3-D object like an apple. We do not even notice it until it crosses our plane of existence — and even then, we have no idea what the apple is,” Sagan explains. “We see only a fragment as it passes through our plane. There is no way we can comprehend the 3-D quality/dimension of the apple, because it is more than we can understand. We only have the evidence of what has passed through our plane.”

Sagan then related this two-dimensional experience of the third dimension to how we might try to understand the fourth. To do so, he used the Tesseract, a four-dimensional cube, to demonstrate how difficult it is for us to perceive or visualize dimensions beyond our own three. At this point, Sagan is asking the viewer to expand their minds to understand the fourth dimension metaphorically.

Sagan’s demonstration of the fourth dimension isn’t just a wonderful explanation of a scientific idea that many of us find difficult to comprehend; it’s also a great example of how to teach complex ideas by combining clear explanations with thought-provoking visuals.


This article originally appeared last year.

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Carl Sagan's irrefutable 1990 argument for using all U.S. resources to fight climate change

He was way ahead of his time and his logic stands now.

via IslandPalm14/YouTube

Carl Sagan's keynote address at the 5th Emerging Issues Forum at NCSU.

Carl Sagan, the legendary astrophysicist and science communicator, was best known for his incredible ability to express complicated concepts in a way that the everyday person could understand. He did so most notably as host of PBS’s groundbreaking “Cosmos: A Personal Voyage" from 1980 to 1981.

Sagan was also a brilliant futurist who was way ahead of his time. In 1961, he predicted that the clouds of Venus might be home to life, an idea that has gained traction over the past few years. He also predicted many of America's current problems in 1995 and correctly claimed that one day AI would be used for psychotherapy back in the '70s.

He was also ahead of his time when sounding the alarm about Climate Change, evidenced by a 1990 speech he gave at the 5th Emerging Issues Forum. In the keynote address, he said that America should treat the climate crisis as seriously as it did the Cold War. Sagan’s speech was delivered a year after the fall of the Berlin Wall, which concluded the icy, 5-decade conflict between the U.S. and the Soviet Union.

For some context, in 1990, only 30% of Americans were worried about global warming or the greenhouse effect. Today, 54% describe climate change as a “major threat” to the country’s well-being.

- YouTubeyoutu.be

“The amount of money that the United States has spent on the Cold War since 1945 is approximately 10 trillion dollars,” Sagan says, adding that with that amount of money, one could own everything in the country, minus the land.

“How certain was it that the Russians were going to invade? Was it 100% certain? Guess not since they never invaded. What if it was only, let’s say 10% certain? What would advocates of big military buildup have said? We must be prudent. It’s not enough to count on only the most likely circumstance," Sagan continues.

“I ask my friends who are comfortable with that argument, including the editorial page of the Wall Street Journal, why doesn’t that same argument apply to Global Warming? You don’t think it’s 100% likely? Fine. You are entitled to think that. If it’s only a small probability of it happening since the consequences are so serious, don’t you have to make some serious investment to prevent it or mitigate it? I think there’s a double standard of argument working and I don’t think we should permit it.”



Sagan would then list the steps we can take to mitigate the effects of climate change, including eliminating CFCs (chlorofluorocarbons), increasing fuel efficiency in cars and trucks, seeking out new alternative energy sources, dealing with the global population crisis and planting trees. "A tree is an engine for taking carbon dioxide out of the atmosphere and it does it. It’s not the only thing a tree does, but that is one of the things that trees are good for and it's especially relevant to this issue,” Sagan says.

Sagan’s solutions are the same ones we discuss today, although fears of a global population crisis have waned over the years.

Sagan concluded his address by comparing the dangers of global warming to those faced by the U.S. during the Cold War and making an argument that many support today: fighting climate change is also good economic policy.

"So, what I say to those who complain that it is too uncertain–beyond pointing out the standards that were applied to the Cold War ought to be applied here–I say look, every one of these steps makes good sense, makes good economic sense,” Sagan says. “And think of all of the industries that are implied by what I have just said, especially alternative energy sources. There is money to be made in developing a technology which will appropriately address greenhouse warming."

You can watch the entire address here:

- YouTubewww.youtube.com

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