astrophysicist popular medias
1 hour ago
If you’re outside the event horizon, being near a black hole is no different than being near any other source of gravity. If the Sun were surreptitiously replaced by a black hole of the exact same mass — 1.99 × 10^30 kg the Earth and all the planets would continue in their orbits in exactly the same fashion they’re moving right now. The reason quasars do what they do, so to speak, is because these incredibly large masses can accelerate matter near them to very rapid speeds.The matter itself forms an accretion disk around the black hole, where it gets accelerated to speeds so great that they give off radiation of many different frequencies, including in the radio. We also see two “lobes” perpendicular to the accretion disk, which are jets of accelerated matter getting ejected at relativistic speeds. The sources we call blazars happen to be oriented with one of the lobes/jets pointed right towards us, while other active galaxies tend to be oriented otherwise. Quasars shine as brightly as they do because the things they devour get stretched apart, torn into bits, and accelerated by the irresistible force of gravity. They put out so much energy because that matter interacts with other bits of matter, heats up and has no choice but to emit radiation. And they’re visible from such great distances because these are black holes hundreds of millions or even billions of times the mass of our Sun, devouring millions of solar masses worth of matter but not devouring tens or hundreds of millions more..
nature #science #theorticalphysics #thermodynamics #physics #astronomer #astronomy #nasa🚀 #nebula #galaxy #knowledge #particlephysics #universe #cosmology #cosmologist #astrophysics #scientist #elonmusk #spacex #stellarphysics #interstellar #education #exploration #star #astrophysicist #hubblespacetelescope #hubble #quantumphysics #gravitationalwaves #physicist #realtivity
3 hours ago
Our Galaxy's Magnetic Center
What's the magnetic field like in the center of our Milky Way Galaxy? To help find out, NASA's SOFIA -- an observatory flying in a modified 747 -- imaged the central region with an instrument known as HAWC+. HAWC+ maps magnetism by observing polarized infrared light emitted by elongated dust grains rotating in alignment with the local magnetic field. Now at our Milky Way's center is a supermassive black hole with a hobby of absorbing gas from stars it has recently destroyed. Our galaxy's black hole, though, is relatively quiet compared to the absorption rate of the central black holes in active galaxies. The featured image gives a clue as to why -- a surrounding magnetic field may either channel gas into the black hole -- which lights up its exterior, or forces gas into an accretion-diskholding pattern, causing it to be less active -- at least temporarily. Inspection of the featured image -- appearing perhaps like a surreal mashup of impasto art and gravitational astrophysics -- brings out this telling clue by detailing the magnetic field in and around a dusty ring surroundingSagittarius A*, the black hole in our Milky Way's center.
Image Copyright: Image Credit: NASA, SOFIA, Hubble
#NASA #nasa #time #times #relativity #einstein #newton #science #sci #astronomy #astrophysics #astrophysicist #cosmology #space #spacex #follow4followback #followers #follow #likelike #like4likes #universe #galaxy #galaxies #radiation #gravity #blackhole #milkyway
6 hours ago
Professor Walter Lewin is one of the greatest Physics professor the history has ever witnessed. Professor Walter Lewin got his PhD in Nuclear Physics from Delft University of Technology .He is featured in the list of The Best 300 Professors" by The Princeton Review and is a host to numerous prestigious awards and honors. He is also a pioneer of new field of X-ray Astronomy.
Videos of Lewin’s lectures on MIT Open Courseware (OCW), YouTube and MOOC have been viewed more than 5 million times by people all over the world.
His passion for his craft resonates in each student of his either in his class or behind the screen. His terrific demonstrations and meticulous use of blackboard space makes learning physics a thrilling experience.
His most popular demonstrations which include swinging a giant pendulum with a 33 lb ball ,using a pendulum as a swing, riding a rocket tricycle powered by a fire extinguisher, and turning cigarette smoke from blue to white by holding it in his lungs has set an unparallel examples.
This is what makes Walter Lewin unique. He puts in all his sweat and energy to make use of his stage and time effectively to deliver a best possible learning experience.
Walter Lewin has also written a book (co-authored by Warren Goldstein) “For the Love of Physics”. The books includes topics that Lewin’s videos have not touched upon including his important research contributions and his own personal journey.
#walterlewin #astrophysicist #physics #fortheloveofphysics #warrengoldstein #pendulum #physicsprofessor
9 hours ago
The Laniakea Supercluster encompasses approximately 100,000 galaxies stretched out over 160 megaparsecs (520 million light-years). It has the approximate mass of 1017solar masses, or a hundred thousand times that of our galaxy, which is almost the same as that of the Horologium Supercluster. It consists of four subparts, which were known previously as separate superclusters:
Virgo Supercluster, the part in which the Milky Way resides.
the Great Attractor, Laniakea's central gravitational point near Norma
Antlia Wall, known as Hydra Supercluster
Southern Supercluster, including Fornax Cluster (S373), Dorado and Eridanus clouds
The most massive galaxy clusters of Laniakea are Virgo, Hydra, Centaurus, Abell 3565, Abell 3574, Abell 3521, Fornax, Eridanus and Norma. The entire supercluster consists of approximately 300 to 500 known galaxy clusters and groups. The real number may be much larger because some of these are traversing the Zone of Avoidance, making them essentially undetectable.
Superclusters are some of the universe's largest structures and have boundaries that are difficult to define, especially from the inside. The team used radio telescopes to map the motions of a large collection of local galaxies. Within a given supercluster, most galaxy motions will be directed inward, toward the center of mass. In the case of Laniakea, this gravitational focal point is called the Great Attractor, and influences the motions of the Local Group of galaxies, where the Milky Way galaxy resides, and all others throughout the supercluster. Unlike its constituent clusters, Laniakea is not gravitationally boundand is projected to be torn apart by dark energy. .
Follow : @astronomydreams .
#science #theorticalphysics #thermodynamics #physics #astronomer #astronomy #nasa🚀 #nebula #galaxy #knowledge #particlephysics #universe #cosmology #cosmologist #astrophysics #scientist #elonmusk #spacex #stellarphysics #interstellar #education #exploration #star #astrophysicist #hubblespacetelescope #hubble #quantumphysics #gravitationalwaves #laniakea
15 hours ago
Agora você sabe: Astrofotógrafo Brasileiro que tem reconhecimento pela NASA
O astrofotógrafo Brasileiro Carlos Kiko Fairbairn é um fotógrafo que tem um reconhecimento internacional pelas suas fotos. Ele já apareceu no site de astrofotgrafia da NASA(APOD) diversas vezes. o APOD é um site da NASA que diariamente eles postam uma foto do espaço, que na maioria das vezes é tirada por amadores. A 1°(20/04/2019) foto da postagem foi a ultima que apareceu no APOD, mostra a constelação de Crux(Cruzeiro do Sul) e também mostra um pouco a nebulosa Coalsack.
Mas uma das suas fotos mais famosas no APOD foi a foto da Lua de sangue no Eclipse Lunar de 2018, juntamente com Marte, tudo isso e a cidade de Rio de Janeiro(2° foto 27/07/2018)
As outras fotos são mais algumas fotos conhecidas dele:
3° foto: O ESO(European Southern Observatory)09/04/2019
4° foto: A Via Láctea 05/04/2019
5° ele se preparando para fotografar o céu com seus equipamentos. ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖
#astrofotografia #nasa #apod #astrophotography #astronomy
#astrophysicist #astronomia #astrofisica #astronomiaamadora #space #agoravocesabe #divisaciencia #espaço #crux #cruzeirodosul #nebula #nebulosas ➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖➖
20 hours ago
So proud of my baby sister who graduated with a degree in Astrophysics this past weekend. Go forth, always look to the stars, and conquer the universe! 🌌
1 day ago
Strawberry Moon over the Temple of Poseidon
Did you see the full moon last night? If not, tonight's nearly full moon should be almost as good. Because full moons areopposite the Sun, they are visible in the sky when the Sun is not -- which should be nearly all night long tonight, clouds permitting. One nickname for June's full moon is the Strawberry Moon, named for when wild strawberries start to ripen in parts of Earth's northern hemisphere. Different cultures around the globe give this full moon different names, though, including Honey Moon and Rose Moon. In the foreground of this featured image, taken yesterday in Cape Sounion, Greece, is the 2,400 year-old Temple of Poseidon. Next month will the 50th anniversary of the time humans first landed on the Moon.
Image Credit & Copyright: Elias Chasiotis
#time #times #gravity #einstein #theory #of #relativity #follow4followback #followers #follower #liker #space #spacex #NASA #nasa #bigbang #astronomy #facts💯 #💯 #fact #universe #imagination #quantum #physics #quantumphysics #astrophysics #astrophysicist #astronomy #astronauts
1 day ago
Two orbs, one galaxy and one solar system. How pretty are these?! Just need to get a stand for each of them. Thank you @stylishgramofficial for sending me these! You can get yourself one at @stylishgramofficial, too! The solar system one has the planets annotated too, I love it soooooo much!
2 days ago
Milky Way over Pyramid of the Feathered Serpent
To see the feathered serpent descend the Mayan pyramid requires exquisite timing. You must visit El Castillo -- inMexico's Yucatán Peninsula -- near an equinox. Then, during the late afternoon if the sky is clear, the pyramid's own shadows create triangles that merge into the famous illusion of theslithering viper. Also known as the Temple of Kukulkan, the impressive step-pyramid stands 30 meters tall and 55 meters wide at the base. Built up as a series of square terraces by the pre-Columbian civilization between the 9th and 12th century,the structure can be used as a calendar and is noted forastronomical alignments. To see the central band of our Milky Way Galaxy descend overhead the Mayan pyramid, however, requires less exquisite timing. Even the ancient Mayans might have been impressed, though, to know that the exact positions of the Milky Way, Saturn (left) and Jupiter (right) in the featured image give it a time stamp more specific than equinox -- in fact 2019 April 7 at 5 am.
Image Credit & Copyright: Robert Fedez
#follow4followback #follow #following #followers #NASA #apollo #science #space #cosmos #universe #darkmatter #physics #astronauts #astrophysics #astronomy #astrophysicist #planets #mountains #pyramid #milkyway
2 days ago
The Solvay Conference, probably the most intelligent picture ever taken, 1927.Take a close look at the photograph. This is probably the only evidence that some of the most brilliant minds, the world has ever witnessed, flourished almost during the same time. In this photograph,taken in October 1927, 17 of the 29 attendees went on to become Nobel laureates. The most famous conference was the October 1927 Fifth Solvay International Conference on Electrons and Photons, where the world’s most notable physicists met to discuss the newly formulated quantum theory. The leading figures were Albert Einstein and Niels Bohr. Einstein disenchanted with Heisenberg’s uncertainty principle, remarked “God does not play dice”, to which Bohr replied, “Einstein, stop telling God what to do”.
Back to front, left to right: Back: Auguste Piccard, Émile Henriot, Paul Ehrenfest, Édouard Herzen, Théophile de Donder, Erwin Schrödinger, JE Verschaffelt, Wolfgang Pauli, Werner Heisenberg, Ralph Fowler, Léon Brillouin.Middle: Peter Debye, Martin Knudsen, William Lawrence Bragg, Hendrik Anthony Kramers, Paul Dirac, Arthur Compton, Louis de Broglie, Max Born, Niels Bohr.Front: Irving Langmuir, Max Planck, Marie Curie, Hendrik Lorentz, Albert Einstein, Paul Langevin, Charles-Eugène Guye, CTR Wilson, Owen Richardson.. PS:- There is a mother too ( Marie Curie).. nature #science #theorticalphysics #thermodynamics #physics #astronomer #astronomy #nasa🚀 #nebula #galaxy #knowledge #particlephysics #universe #cosmology #cosmologist #astrophysics #scientist #elonmusk #spacex #stellarphysics #interstellar #education #exploration #star #astrophysicist #hubblespacetelescope #hubble #quantumphysics #gravitationalwaves #physicist #realtivity
2 days ago
If you were to take the Sun away, space would go from being curved to being flat, but that transformation isn’t instantaneous. Because spacetime is a fabric, that transition would have to occur in some sort of “snapping” motion, which would send very large ripples i.e., gravitational waves through the Universe, propagating outward like ripples in a pond. The speed of those ripples is determined the same way the speed of anything is determined in relativity: by their energy and their mass. Since gravitational waves are massless yet have a finite energy, they must move at the speed of light. Which means, if you think about it, that the Earth isn’t directly attracted to the Sun’s location in space, but rather to where the Sun was located a little over 8 minutes ago.This is weird, and potentially a problem, because of how well-studied the Solar System is. If the Earth were attracted to the Sun’s position ~8 minutes ago using Newton’s Laws, the orbits of the planets wouldn’t match observations. There’s another way that General Relativity is different, however. You also need to factor in the orbiting planet’s velocity as it moves around the Sun.The Earth, for example, since it’s also moving, kind of “rides” over the ripples traveling through space, coming down in a different spot from where it was lifted up. There are two new effects going on in General Relativity that make this theory very different from Newton’s: each object’s velocity affects how it experiences gravity, and so do the changes that occur in gravitational fields.. nature #science #theorticalphysics #thermodynamics #physics #astronomer #astronomy #nasa🚀 #nebula #galaxy #knowledge #particlephysics #universe #cosmology #cosmologist #astrophysics #scientist #elonmusk #spacex #stellarphysics #interstellar #education #exploration #star #astrophysicist #hubblespacetelescope #hubble #quantumphysics #gravitationalwaves #physicist #realtivity
6 days ago
- A book about Einsteins life, achievements, theories and philosophical thoughts.
1 week ago
It was Einstein’s special theory of relativity that led his former professor Minkowski, to devise a formulation that put the three space dimensions and the one time dimension together. We all realize that to move through space requires motion through time; if you’re here, now, you cannot be somewhere else now as well, you can only get there later. The biggest breakthrough came in 1907, when Minkowski realized that Einstein’s relativity had an extraordinary implication: mathematically, time behaves exactly the same as space does, except with a factor of c, the speed of light in vacuum, and a factor of i, the imaginary number √(-1). (1)-If you’re completely stationary, remaining in the same spatial location, you move through time at its maximal rate. (2)- The faster you move through space, the slower you move through time, and the shorter the spatial distances in your direction-of-motion appear to be. (3)- And if you were completely massless, you would move at the speed of light, where you would traverse your direction-of-motion instantaneously, and no time would pass for you.Today, the formulation of spacetime is even more generic, and encompasses the curvature inherent to space itself, which is how special relativity got generalized. But the reason time is just as good a dimension as space is because we’re always moving through it, and the reason it’s sometimes written as a “1″ in “3+1″ (instead of just treated as another “1″ of the “4″) is because increasing your motion through space decreases your motion through time, and vice versa. The remarkable thing is that anyone, regardless of their motion through space relative to anyone else, will see these same rules, these same effects and these same consequences. If time weren’t a dimension relativity would be invalid..nature #science #theorticalphysics #thermodynamics #physics #astronomer #astronomy #nasa🚀 #nebula #galaxy #knowledge #particlephysics #universe #cosmology #cosmologist #astrophysics #scientist #elonmusk #spacex #stellarphysics #interstellar #education #exploration #star #astrophysicist #hubblespacetelescope #hubble #quantumphysics #gravitationalwaves #physicist #realtivity