Astrophysics is a branch of astronomy that deals with the physics of celestial objects and phenomena. It involves the study of the properties and behavior of planets, stars, galaxies, black holes, dark matter, and other astronomical objects, as well as the interactions between them. Astrophysicists use principles and techniques from physics, such as mechanics, electromagnetism, thermodynamics, and quantum mechanics, to understand the nature and evolution of the universe on a large scale. They seek to answer fundamental questions about the origin, structure, and fate of the cosmos. Astrophysics encompasses a wide range of topics, including cosmology, stellar astrophysics, galactic astronomy, and planetary science.
Astrophysics Quotes
1. “I love the smell of the universe in the morning.”
— Neil deGrasse Tyson
2. “Somewhere, something incredible is waiting to be known.”
— Carl Sagan
3. “We are all connected; To each other, biologically. To the earth, chemically. To the rest of the universe atomically.”
— Neil deGrasse Tyson
4. “I look up at the night sky, and I know that, yes, we are part of this Universe, we are in this Universe, but perhaps more important than both of those facts is that the Universe is in us. When I reflect on that fact, I look up — many people feel small, because they’re small and the Universe is big, but I feel big, because my atoms came from those stars.”
— Neil deGrasse Tyson
5. “We are part of this universe; we are in this universe, but perhaps more important than both of those facts, is that the universe is in us.”
— Neil deGrasse Tyson
6. “Physicists are made of atoms. A physicist is an attempt by an atom to understand itself.”
— Michio Kaku
7. “I have always believed that astrophysics should be the extrapolation of laboratory physics, that we must begin from the present universe and work our way backward to progressively more remote and uncertain epochs.”
— Hannes Alfven
8. “In whatever you choose to do, do it because it’s hard, not because it’s easy. Math and physics and astrophysics are hard. For every hard thing you accomplish, fewer other people are out there doing the same thing as you. That’s what doing something hard means. And in the limit of this, everyone beats a path to your door because you’re the only one around who understands the impossible concept or who solves the unsolvable problem.”
— Neil deGrasse Tyson
9. “We are in danger of destroying ourselves by our greed and stupidity. We cannot remain looking inwards at ourselves on a small and increasingly polluted and overcrowded planet.”
— Stephen Hawking
10. “If the Sun exploded, we wouldn’t know about it for 8 minutes and 20 seconds. Light and gravity take that long to reach us. Then we would vaporize.”
— Neil deGrasse Tyson
11. “The remarkable feature of physical laws is that they apply everywhere, whether or not you choose to believe in them. After the laws of physics, everything else is opinion.”
— Neil deGrasse Tyson
12. “We are not at the end but at the beginning of a new physics. But whatever we find, there will always be new horizons continually awaiting us.”
— Michio Kaku
13. “Trying to save a hater is like trying to teach astrophysics to a wino!”
— Nick Cannon
14. “What counts is not what sounds plausible, not what we would like to believe, not what one or two witnesses claim, but only what is supported by hard evidence rigorously and skeptically examined. Extraordinary claims require extraordinary evidence.”
— Carl Sagan
15. “Many people feel small because they’re small and the universe is big, but I feel big.”
— Neil deGrasse Tyson
16. “If we restructure things to see that the hero’s journey is a degree in astrophysics rather than a journey to star in a reality show, that’s a better world.”
— John Green
17. “I’m convinced that imagination is at the heart of everything we do – in art, science, even astrophysics and higher mathematics. Imagination leads us to ask, “What if?””
— Lloyd Alexander
18. “The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.”
— Albert Einstein
19. “In astrophysics, we care about how matter, motion and energy manifest in objects and phenomenon in the universe. Stars are born. They live out their lives. They die. Some of the ones that die explode. Our sun will not be one of those, but it will die. And it’ll take Earth with us. So we make sure we have other destinations in mind when that happens. And I’ve got it on my calendar.”
— Neil deGrasse Tyson
20. “I dream of a world where the truth is what shapes people’s politics, rather than politics shaping what people think is true.”
— Neil deGrasse Tyson
21. “Just to settle it once and for all: Which came first, the chicken or the egg? The egg, laid by a bird that was not a chicken.”
— Neil deGrasse Tyson
22. “How then did we come to the “standard model”? And how has it supplanted other theories, like the steady state model? It is a tribute to the essential objectivity of modern astrophysics that this consensus has been brought about, not by shifts in philosophical preference or by the influence of astrophysical mandarins, but by the pressure of empirical data.”
— Steven Weinberg
23. “It turns out that the history of astrophysics is where we perfected time keeping.”
— Neil deGrasse Tyson
24. “I have no trouble publishing in Soviet astrophysical journals, but my work is unacceptable to the American astrophysical journals.”
— Hannes Alfven
25. “I try to show the public that chemistry, biology, physics, astrophysics is life. It is not some separate subject that you have to be pulled into a corner to be taught about.”
— Neil deGrasse Tyson
26. “It is only myth that attempts to say how the universe came to be, either four thousand or twenty billion years ago.”
— Hannes Alfven
27. “Anyone who has wrestled knows that it’s the hardest thing in the world to do. Anyone who says something else is the hardest thing has never wrestled. That’s what I have found. … You don’t wrestle because it’s easy, you wrestle because it’s hard. I don’t do astrophysics because it’s easy, I do it because it’s hard. And I juxtapose the two in my mind, body, and soul all the time.”
— Neil deGrasse Tyson
28. “Some people seek meaning in life through personal gain, through personal relationship, or through personal experiences. However, it seems to me that being blessed with the intellect to divine the ultimate secrets of nature gives meaning enough to life.”
— Michio Kaku
29. “In our civilization, there are permanent forms which are part of every epoch and every culture. They are not especially difficult to detect. A minimal knowledge of physics, astrophysics, and perhaps mathematics, brings to light certain patterns that make these subjects easier to understand. It is striking to see the extreme similarity between these scientific propositions and the forms that recur in all times, places and civilizations.”
— Philippe Starck
30. “At the fourth grade level, girls at the same percentages of boys say they’re interested in careers in engineering or math or astrophysics, but by eighth grade that has dropped precipitously.”
— Chelsea Clinton
31. “Mathematics is not something that you find lying around in your back yard. It’s produced by the human mind. Yet if we ask where mathematics works best, it is in areas like particle physics and astrophysics, areas of fundamental science that are very, very far removed from everyday affairs.”
— Paul Davies
32. “The problem in society is not kids not knowing science. The problem is adults not knowing science. They outnumber kids 5 to 1, they wield power, they write legislation. When you have scientifically illiterate adults, you have undermined the very fabric of what makes a nation wealthy and strong.”
— Neil deGrasse Tyson
33. “We in astrophysics we think of the universe all the time. So to us, Earth is just another planet. From a distance, it’s a speck. And I’m convinced that if everyone had a cosmic perspective you wouldn’t have legions of armies waging war on other people because someone would say, “Stop, look at the universe.””
— Neil deGrasse Tyson
34. “Not only are we in the universe, the universe is in us. I don’t know of any deeper spiritual feeling than what that brings upon me.”
— Neil deGrasse Tyson
35. “Students using astrophysical textbooks remain essentially ignorant of even the existence of plasma concepts, despite the fact that some of them have been known for half a century. The conclusion is that astrophysics is too important to be left in the hands of astrophysicists who have gotten their main knowledge from these textbooks. Earthbound and space telescope data must be treated by scientists who are familiar with laboratory and magnetospheric physics and circuit theory, and of course with modern plasma theory.”
— Hannes Alfven
36. “My favourite fellow of the Royal Society is the Reverend Thomas Bayes, an obscure 18th-century Kent clergyman and a brilliant mathematician who devised a complex equation known as the Bayes theorem, which can be used to work out probability distributions. It had no practical application in his lifetime, but today, thanks to computers, is routinely used in the modelling of climate change, astrophysics and stock-market analysis.”
— Bill Bryson
37. “I have no trouble publishing in Soviet astrophysical journals, but my work is unacceptable to the American astrophysical journals.
[Referring to the trouble he had with the peer reviewers of Anglo-American astrophysical journals because his ideas often conflicted with the generally accepted or “standard”” theories.]”
— Hannes Alfven
38. “It is often stated that of all the theories proposed in this century, the silliest is quantum theory. In fact, some say that the only thing that quantum theory has going for it is that it is unquestionably correct.”
— Michio Kaku
39. “By analyzing data from Greenwich Observatory in the period 1836-1953, John A. Eddy [Harvard-Smithsonian Center for Astrophysics and High Altitude Observatory in Boulder] and Aram A. Boornazian [mathematician with S. Ross and Co. in Boston] have found evidence that the sun has been contracting about 0.1% per century during that time, corresponding to a shrinkage rate of about 5 feet per hour. And digging deep into historical records, Eddy has found 400-year-old eclipse observations that are consistent with such a shrinkage.”
— Jonathan Sarfati
40. “I was there when Abbe Georges Lemaître first proposed this [Big Bang] theory. … There is no rational reason to doubt that the universe has existed indefinitely, for an infinite time. …. It is only myth that attempts to say how the universe came to be, either four thousand or twenty billion years ago.”
— Hannes Alfven
41. “Scientists willing to risk their reputations on higher dimensions soon found themselves ridiculed by the scientific community. Higher-dimensional space became the last refuge for mystics, cranks, and charlatans.”
— Michio Kaku
42. “Civilization just takes it as a given that the whole world was flooding. Then science came and you had geology and modern astrophysics, and time became well understood going back billions of years. So enlightened religious people, as a necessity, had to shed the magical elements of the Bible. A little known fact is that Thomas Jefferson did just that. There’s something called the Jefferson Bible. It’s not widely publicized because it sort of conflicts with certain people’s ideas of what the founding fathers were.”
— Neil deGrasse Tyson
43. “I will stress once again that we do not know the source from which the UFOs or the alien beings come whether or not, for example, they originate in the physical universe as modern astrophysics has described it). But they manifest in the physical world and bring about definable consequences in that domain.”
— Jacques Vallee
44. “At one point I wanted to work for NASA and be an astrophysicist, so I did physics, math, and chemistry before realizing I probably wasn’t quite smart enough to do that. But I am still hugely interested in cosmology and astrophysics. That is my geeky subject area.”
— Gemma Chan
45. “Hoyle’s enduring insights into stars, nucleosynthesis, and the large-scale universe rank among the greatest achievements of 20th-century astrophysics. Moreover, his theories were unfailingly stimulating, even when they proved transient.”
— Fred Hoyle
46. “I’ve had young women come to me and say that before they watched ‘Voyager’ it didn’t really occur to them that they could be successful in a higher position in the field of science; girls going to MIT, girls pursuing astrophysics with a view to a career in NASA.”
— Kate Mulgrew
47. “I gained a first class degree in Physics at Imperial College London in 1968 and did research in solid state physics, but did not pursue meteorology matters until gaining an M.Sc. in astrophysics from Queen Mary College London in 1981, after which I investigated and attempted to construct theories of solar activity.”
— Piers Corbyn
48. “Plainly, such an approach does not exclude other ways of trying to comprehend the world. Someone committed to it (as I am) can consistently believe (as I do) that we learn much more of human interest about how people think and feel and act by reading novels or studying history than from all of naturalistic psychology, and perhaps always will; similarly, the arts may offer appreciation of the heavens to which astrophysics cannot aspire.”
— Noam Chomsky
49. “General relativity is the cornerstone of cosmology and astrophysics. It has also provided the conceptual basis for string theory and other attempts to unify all the forces of nature in terms of geometrical structures.”
— Paul Davies
50. “Like no other science, astrophysics cross-pollinate s the expertise of chemists, biologists, geologists and physicists, all to discover the past, present, and future of the cosmos-and our humble place within it.”
— Neil deGrasse Tyson
51. “What is surprising is that almost all the trends that developed within the sciences, Aristotelianism and an extreme Platonism included, produced results, not only in special domains, but everywhere; there exist highly theoretical branches of biology and highly empirical parts of astrophysics. The world is a complex an many-sided thing.”
— Paul Feyerabend
52. “The most accessible field in science, from the point of view of language, is astrophysics. What do you call spots on the sun? Sunspots. Regions of space you fall into and you don’t come out of? Black holes. Big red stars? Red giants. So I take my fellow scientists to task. He’ll use his word, and if I understand it, I’ll say, “Oh, does that mean da-da-da-de-da?”
— Neil deGrasse Tyson
