9 Quotes By Carl Sagan On Astronomy

Carl Sagan was an American scientist (1934-1996) who is best known for his TV show Cosmos: a personal voyage and inspiring astrophysicists like Neil deGrasse Tyson to pursue astronomy. Carl Sagan was an expert in the field of exobiology and search for extraterrestrial life.

Carl Sagan also worked with NASA on various projects including the Pioneer plaque and Voyager golden record, which were the first physical messages sent to space. Since Carl Sagan was born on November 9, celebrated as Carl Sagan day across America, following are 9 quotes on astronomy by Carl Sagan:

1. The cosmos is within us. We're made of star stuff. We are a way for the cosmos to know itself.

2. Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.

3. For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.

4. Virtually every newspaper in America has a daily column on astrology; there are hardly any that have even a weekly column on astronomy.

5. Our posturings, our imagined self-importance, the delusion that we have some privileged position in the Universe, are challenged by this point of pale light. Our planet is a lonely speck in the great enveloping cosmic dark.

Earth as a point of pale blue light, picture by NASA

6. I stress that the universe is made mostly of nothing, that something is the exception.

7. A tiny blue dot set in a sunbeam. Here it is. That's where we live. That's home. We humans are one species and this is our world. It is our responsibility to cherish it. Of all the worlds in our solar system, the only one so far as we know, graced by life.

8. In the long run, every planetary society will be endangered by impacts from space, every surviving civilization is obliged to become spacefaring — not because of exploratory or romantic zeal, but for the most practical reason imaginable: staying alive.

9. In the vastness of the Cosmos there must be other civilizations far older and more advanced than ours.

10 Facts About Astrophysicist Subrahmanyan Chandrasekhar

Astrophysicist Subrahmanyan Chandrasekhar [1910 - 1995] was a Nobel prize winning scientist from India who is best known for studying the evolution of stars. He accepted American citizenship in 1953 and taught at the University of Chicago for almost all his life.

Following are 10 amazing facts on physicist Subrahmanyan Chandrasekhar:

1. He found the Chandrasekhar limit, currently accepted as 1.4 solar masses, which is the maximum mass of a stable white dwarf star. If a star is more massive than this limit, it might end up as a black hole.

2. Chandrasekhar was tutored at home until the age of 12. In middle school, his father taught him mathematics and physics while his mother taught him Tamil and English.

3. Chandrasekhar studied at Presidency College in Chennai and the University of Cambridge. He was a long-time professor at the University of Chicago and editor of The astrophysical journal.

4. His paternal uncle was the Indian physicist and Nobel laureate C.V. Raman, who was the first Indian to win the coveted Nobel prize for discovery of Raman effect.

5. Subrahmanyan Chandrasekhar himself won the Nobel prize for physics in 1983 for his mathematical treatment of stellar evolution.

6. Chandra X-ray observatory, launched in 1999, is a flagship space telescope of NASA which is named after him.

7. Chandrasekhar was in dispute with English astronomer Arthur Eddington over the final stages of a star's life. Eddington, a renowned physicist, openly mocked and criticized Chandrasekhar limit in 1935.

Chandrasekhar continued to state that he admired Eddington and considered him a friend.

8. Chandra worked closely with his students and expressed pride in the fact that over a 50-year period (from roughly 1930 to 1980), the average age of his co-author collaborators had remained the same, at around 30.

9. Two of the students who took his course at University of Chicago, Tsung-Dao Lee and Chen-Ning Yang, won the Nobel prize before he could get one for himself. Chandrasekhar supervised 45 PhD students in his teaching career.

10. After his death, his wife Lalitha made a gift of his Nobel Prize money to the University of Chicago towards the establishment of the Subrahmanyan Chandrasekhar Memorial Fellowship.

Bonus fact - Chandrasekhar was offered double salary at Princeton University in 1946 but the University of Chicago president matched the salary to keep Chandrasekhar in Chicago.

No Contradiction Between Physics And Religion: Max Planck

Max Planck was a German theoretical physicist who is regarded as the father of quantum mechanics. Planck won the Nobel Prize in physics in 1918, for the discovery of energy quanta.

While solving for energy quantum, Max Planck stumbled upon a very small number which is the foundation of modern physics. Planck is well known for this constant which has been named in his honor, h = 6.62607015 × 10-34 m2 kg / s.

Planck came from a traditional family, a generation of theology professors in Gottingen. Plank's father broke that tradition by teaching law. Later on Planck too, as he became a professor of physics. However, while Planck was driven mainly by science, he was also religious by heart.

According to Planck, there was no contradiction between science and religion. Religion and natural science (read: physics) do not exclude each other, as many contemporaries of ours would believe or fear, Planck said. They mutually supplement and condition each other.

The following quotes are by Planck on science and religion:

1. Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are part of nature and therefore part of the mystery that we are trying to solve.

2. Experiments are the only means of knowledge at our disposal. The rest is poetry, imagination.

3. My research on the atom has shown me that there is no such thing as matter in itself. What we perceive as matter is merely the manifestation of a force that causes the subatomic particles to oscillate and holds them together in the tiniest solar system of the universe

4. Natural science wants man to learn, religion wants him to act.

5. Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: Ye must have faith. It is a quality which the scientist cannot dispense with.

5 Predictions of Nikola Tesla That Came True (And 5 That Didn't)

Nikola Tesla was a genius Serbian American inventor who laid the foundations of alternate current power system. Tesla was an advocate of modern technology and made many convincing predictions about the future. Some of Tesla's predictions were proven correct in the 21st century and some have gone wrong, as you shall see in this post.

1. (Right) Alternating current

Nikola Tesla pioneered the generation, transmission and use of alternating current electricity. Tesla believed that one day in the future the entire world would use his power system over direct current.

Thomas Edison famously tried to show with experiment that alternating current was deadly. However, Tesla overcame that fear mongering by showing that AC was safe, inexpensive and usable over large distances.

2. (Wrong) Interplanetary energy exchange

One can see that Tesla and his ideas were on another level when he said that he would be able to complete interplanetary communication. In 1931, Tesla proposed a way in the future that would allow planets to transmit energy, from one planet to another, in large amounts of horsepower - regardless of distance.

3. (Right) Smartphone

In 1908, Tesla said - An inexpensive instrument, not bigger than a watch, will enable one to call up, from one's desk, and talk to any telephone subscriber on the globe. Any picture, character, drawing, or print can be transferred from one to another place.

4. (Wrong) Unlimited free energy

Tesla envisioned a future in which humans are able to harness the energy of ionosphere and distribute it wirelessly to anyone anywhere on the planet. This concept, while inspiring, has not been realized because of practical reasons.

5. (Right) Thought images, MRI

Tesla: I expect to photograph thoughts. In 1893, while engaged in certain investigations, I became convinced that a definite image formed in thought must produce a corresponding image on the retina, which might be read by a suitable apparatus.

The closest machine able to do as Tesla suggested is MRI scan. An fMRI scan can tell you something about what a person is thinking. Tesla predicted - "Our minds would then, indeed, be like open books."

6. (Wrong) Wireless electricity

One notable incorrect prediction of Nikola Tesla is transmission of wireless electricity through the air. There would be no need for wires in the future for long distance transfer using his Wardenclyffe tower. This idea of Tesla was impractical on many levels and was not realized on large scale.

7. (Right) Wi-fi

While wireless electricity did not succeed, wireless transfer of files - documents, photos, music, video worked. His prediction of the internet came true in the 1980s and wireless file transfer in the 1990s.

8. (Wrong) Anti gravity tech

Tesla predicted an anti-gravity technology which would allow levitation in day to day life. Despite ongoing research in this field, anti gravity remains impractical and still quite far from reality.

9. (Right) Robotics and automation

Tesla predicted that robots will replace humans in many fields. He predicted driverless cars. He predicted robots would do menial labor like lifting and loading. Today, not only this, but automation via artificial intelligence is putting human creativity at risk, as they create art and music.

10. (Wrong) Weather control

While modern science has explored temporary weather modification techniques like cloud seeding, a complete control of weather and climate as Tesla had envisioned has not come to fruition.

Paul Dirac versus Richard Feynman

Feynman and Dirac, two great physicists who made invaluable contribution to quantum mechanics and Nobel prize winners, were poles apart.

While Richard Feynman idolized Paul Dirac, they disagreed on many things. One remembers Dirac as an extremely shy person, who hesitated to speak. Feynman, on the contrary, was a chatty man whose anecdotes spread contagious laughter.

Dirac won the Nobel prize for correctly predicting the existence of anti-matter. Three decades later, Feynman won the coveted prize for his work with elementary particles.

Both physicists had a very distinct view of science. Dirac was inclined towards mathematics and considered beauty in one's equations to be important. While Feynman preferred the equation to stand the test of experiment.

Feynman said - Physics is not mathematics. Mathematics is not physics. One helps the other.

Dirac was of the view - It is more important to have beauty in one's equations than to have them fit experiment.

You can say that in this regard Feynman and Dirac were rivals as they say "Raibaru" in Japanese. They did not seem to agree on this one thing.

Yet, as a young man Feynman idolized Dirac. He said - 

Dirac made a breakthrough, a new method of doing physics. He had the courage to simply guess at the form of an equation, and to try to interpret it afterwards.

This equation is now called Dirac equation. It is a beautiful, small equation that predicts counterpart of matter, anti-matter. In 1932, Paul Dirac was recognized by Nobel prize in physics for his work.

Later on, Feynman's views changed.

Being a mathematical physicist, Dirac was of the view that if an equation has beauty, then one must be working correctly, on the right path. Feynman disagreed that beauty is paramount, but he still remained a Dirac fanboy.

Feynman's evolved thought was

No matter how beautiful an equation is, no matter who made the equation or how genius he was, if it disagrees with experiment, it is wrong!

In 1962, the two great minds Feynman and Dirac met at a science conference.

Feynman a chatty fellow talked at length while a meek old man Dirac listened quietly. In the end, Dirac blurted out a question - I have an equation. Do you have one too?

Earlier in 1948, Feynman had invented a diagram to pictorially represent the interaction of subatomic particles. For this simplification work, Feynman won the Nobel prize in 1965. It is then interesting to note that both scientists won the Nobel prize in physics for proposing a simple solution.

One key takeaway from this story is that it takes courage to challenge your idol. Feynman admired Dirac all his life, but it was not wrong for him to disagree with his hero once in a while. Isn't that how science progresses? When great minds collide?

10 Motivational Quotes By Albert Einstein

Everyone would agree that Albert Einstein was the greatest physicist of all time. Einstein won the Nobel Prize for explaining the photoelectric effect thereby paving a way for quantum mechanics to bloom, but he is most well know for equation E = m c^2.

More than that, Einstein developed a new theory of universal gravitation, an improvement over Newton's version, in which Einstein imagined a curving space and time resulting in a force we call gravity. Einstein spent his last years to find the ultimate theory of the universe.

Today, Albert Einstein is remembered not only as a great scientist, but also as a wise man, who inspired students with his witty remarks. Einstein was featured in the movie Oppenheimer, giving advice to physicist Robert Oppenheimer.

Following are ten quotes by Einstein to help students succeed in academics and in life:

1. Great spirits have always encountered violent opposition from mediocre minds.

2. Never memorize something that you can look up.

3. Anyone who has never made a mistake has never tried anything new.

4. Logic will get you from A to Z; imagination will get you everywhere.

5. The world is a dangerous place to live, not because of the people who are evil, but because of the people who don't do anything about it.

6. I have no special talents. I am only passionately curious. The important thing is not to stop questioning. Curiosity has its own reason for existence.

7. The measure of intelligence is the ability to adapt to change.

8. What is right is not always popular and what is popular is not always right.

9. Life is like riding a bicycle. To keep your balance, you must keep moving.

10. I speak to everyone in the same way, whether he is the garbage man or the president of the university.