What Does An Electron ACTUALLY Look Like? - YouTube - PBS Space Time - physics - new episode

An electron is a ball of energy.As Einstein discovered in his General Theory of Relativity,bound energy also has mass.An electron's classical radius is 2.818x10 (-15)m;but its true size is 10 (-17)m,or at least 100x smaller than the classical radius.Photons are excitations of the Electromagnetic Field.Electron and Positron pairs are excitations of the Electron Field and may annihilate one another.In Quantum Field Theory,each elementary particle,such as an electron,is an excitation of its own quantum field.Quantum particles consist of waves,but when we examine a specific particle,it becomes a point.*Dr. Matt O'Dowd is an Australian astrophysicist and presenter of PBS Space time and wrote this episode.

Decoding the Universe: Quantum | Full Documentary | NOVA | PBS - YouTube - physics/astrophysics

Albert Einstein's General Theory of Relativity predicted the existence of gravitational waves,but he didn't live to see their confirmation,which first occurred in 2017.Gravitational waves are emmited by the most powerful events in the universe,such as the merger of black holes or neutron stars.

Brightest Gamma-Ray Burst Of All Time had a curious feature, NASA Fermi Finds - NASA Goddard - astrophysics

Gamma-Ray Bursts are formed when a new black hole expels matter into space.The Brightest Burst of All Time (BOAT) was detected using the NASA Fermi Space Telescope om 2022.A study of the data has revealed a new feature.The particles emitting the Gamma-Ray line must have been traveling at 99.9% of the speed of light.The speed of light is the fastest speed in the universe and is a constant speed,regardless of how fast you're traveling when you observe light,according to Albert Einstein's Special Theory of Relativity,the American Museum of Natural History (AMNH) points out.His exploration of the fundamental properties of light was an astonishing recognition and revolutionized our understanding of space and time.The Special Theory laid the groundwork for his greatest achievement,the General Theory of Relativity.*Both the Special Theory and General Theory have repeatedly been verified.For instance,the Special Theory,proposed in 1905,has been validated through experiments using high-speed particles and precise time measurements.For example,the time dilation effect has been confirmed using atomic clocks on fast-moving aircraft.One of the earliest confirmations of the General Theory,proposed in 2015,took place in 1919 with observations of the bending of light by a solar eclipse.A more recent confirmation was the detection of gravitational waves in 2018 by two LIGOs,Laser Interferometer Gravitational-Wave Observatories. * Credit:NASA Goddard Space Flight Center

ESA's Euclid celebrates first science with sparkling cosmic views - YouTube - astrophysics

The ESA/NASA Euclid spacecraft promises a wealth of new discoveries because of its unprecedented wide field of view and optical sharpness.It can detect dark matter and dark energy because of these qualities.For example,the large amount of gravitational lensing,a curvature of spacetime,caused by the gravity of massive objects,reveals the substantial presence of dark matter.This was predicted by Einstein's General Theory of Relativity.*Brown dwarf substellar objects,which are failed stars,may account for much of the dark matter in the universe.Brown dwarfs lacked enough mass to initiate thermonuclear fusion.*Even the first five Euclid images have advanced our knowledge of the universe.

Hubble’s Inside the Image: Lensed Supernova Refsdal - YouTube - NASA Goddard - astrophysics

Albert Einstein predicted gravitational lensing,the warping of spacetime by the gravitational pull of massive objects such as galaxies.Gravity is actually a curvature in spacetime and can have the effect of enabling observation of very distant objects.This can also be used to ascertain how fast the universe is expanding.

Gravitational Waves: Ripples In Space-Time - NASA Goddard - astrophysics

Notes by NASA Goddard:Gravitational waves are ripples in the fabric of spacetime.They are caused by some of the most violent and energetic events in the universe,including colliding black holes;merging neutron stars or white dwarf stars;the wobble of neutron stars that are not perfect spheres;and possibly even the remnants of gravitational radiation create by the birth of the universe.*Gravitational waves were predicted by Einstein's General Theory of Relativity,but weren't confirmed until 2017.The NASA/ESA Hubble Space Telescope was able to photograph the galactic source of the waves.This opens up a new era of multi-messenger astronomy.

2024 Total Solar Eclipse News Conference

The Parker Solar Probe will get very close to the sun and gather data on the eclipse never possible before.A NASA WB-40 aircraft will also gatger unique data as it chases the eclpse,getting an extra two minutes of totality.Astronauts aboard the ISS will gather data from a unique perspective,seeing the shadow of the Moon on the Earth.A NOAA satellite will study the effect of the eclipse on the ionosphere.An eclipse was used to confirm Albert Einstein's General Theory of Relativity by observing gravitational lensing,the bending of starlight around the curvature of spacetime.NASA TV will provide live coverage of the eclipse from 1-4 pm EDT on 8 April 2004 and this blog intends to cover it.If you can't watch it live,you should be able to see a recorded version of it as well later on.

Hubble’s Inside The Image: Abell 2744 - NASA Goddard - astrophysics

Because of the intense gravity exerted by galaxy cluster Abell 2744,gravitational lensing,which is a curvature of space,occurs as predicted by Albert Einstein and we are able to look back in time at galaxies in the early universe about 12 billion light years away.The universe is about 13.8 billion years old.Galaxy cluster Abell 2744 also contains dark matter.

Milky Way's black hole may be spinning 'football-shaped' spacetime warp - astrophysics

Studies of the supermassive black hole in the center of the Milky Way,Sgr A*,were made using the NASA Chandra X-ray Observatory and the National Science Foundation (NSF) Very Large Array,an array of radio telescopes in New Mexico. The singularity of a black hole was predicted by Einstein's General Theory of Relativity,yet was never confirmed by observation in his lifetime.A singularity has zero volume yet infinite density,hence it bends spacetime to an infinite extent.As you approach a singularity,time slows down from an observer's point of view,but not from the one being observed's point of view (relativity).It slows down so much it virtually stops,with one minute being approximately 1,700,000 years long.This is experienced by astronauts in low Earth orbit to a minor extent because the Earth's large mass causes ripples in spacetime.Even light,which has no mass,must follow the curvature of space in the presence of a black hole.Hence astronomers detected X-ray flashes on the opposite side of a black hole,confirming Einstein's theory yet again.

About the Einstein Probe and Einstein's prediction of Gravitational waves

Einstein's General Theory of Relativity predicted the existence of Gravitational waves caused by massive events in the universe.These were not detected in Einstein's lifetime,however.The first indirect evidence of Gravitational waves was deduced in 1974 from the motion of a double neutron star system,leading to their maerger.The first direct observations of Gravitational waves took place on 14 September 2015 by the LIGO and Virgo collaboration.The signal was evidence of the inward spiral and merger of two black holes.A third possibility of detecting Gravitational waves would be the assyemetrical explosion of a supernova.So far,no such event has been detected,as supernovas are generally spherically symmetrical;only the mergers of black holes and neutron stars have been captured.

Euclid's first images: the dazzling edge of darkness - mission milestone - cosmology

Gravitational Waves: Ripples In Space-Time - NASA Goddard