Why Quasars are so Awesome | PBS Space Time - astrophysics/cosmology

Supermassive black holes create accretion disks,or quasars,when gas is swept into the disks.Quasi-stellar radio source 3C273 was discovered by a radio telescope in Australia.Jets of material are sometimes produced by quasars that travel near the speed of light.Quasars are also called an Active Galactic Nucleus,since they are associated with a supermassive black hole at the center of a galaxy.Quasars are so bright,we can see them at the edge of the universe.*Dr.Matt O'Dowd is an Australian astrophysicist and the presenter,writer or co-writer of PBS Space Time.*Cosmology is the study of the origin,evolution and structures of the universe.

The Cosmic Dark Ages - YouTube - PBS Space Time - astrophysics/cosmology

Dr.Matt O'Dowd is an Australian astrophysicist who presented and wrote this episode of PBS Space Time.Recombination:In the blazing heat of the Big Bang,atoms were stripped of their electrons.This was gradually reversed in the reionisation era.The first light was the Cosmic Microwave Backgoround (CMB).The first stars were formed about 150 million years after the Big Bang.Before that were the Cosmic Dark Ages.*Cosmology is the study of the origin,evolution and structures of the universe.

Can Space Time Remember? - YouTube - PBS Space Time - astrophysics - new episode

Dr.Matt O'Dowd is an Australian astrophysicist and the host and writer or co-writer of PBS Space Time.

The Alchemy of Neutron Star Collisions - YouTube - PBS Space Time - astrophysics

A collision of neutron stars created some of the heavy elements found in the human body.*Dr.Matt O'Dowd is an Australian astrophysicist and the presenter and writer or co-writer of PBS Space Time.

Neutron Stars: The Most Extreme Objects in the Universe - YouTube - PBS Space Time - astrophysics

Neutron stars have the strongest magnetic fields in the universe.They actually have a solid,crystalline surface and tiny subsurface mountains.Then there is nuclear spaghetti,which is the strongest substance in the universe,as it stands up to the crushing gravity of neutron stars.*Dr.Matt O'Dowd is an Australian astrophysicist and the host and writer or co-writer of PBS Space Time.

Do Neutron Stars Shine In Dark Matter? - YouTube - PBS Space Time - new video - astrophysics

Neutron stars may produce the exotic Axion,a dark matter candidate.Axions can turn into the packets of light called photons.*Neutron stars have strong magnetic fields.Axions may or may not exist,but,if they do,neutron stars produce vast quantities of these dark matter particles and are cloaked in a cloud of them.*The neutron stars that are pulsars may be the source of the mysterious Fast Radio Bursts that puzzle astronomers.Pulsars are rapidly rotating neutron stars that blast out pulses of radiation at regular intervals ranging from seconds to milliseconds.Pulsars have strong magnetic fields that funnel particles accelerating to relativistic speeds,which produces two powerful beams of light.*Albert Einstein won the Nobel Prize for Physics in 1921,especially for his discovery of the photoelectric effect.Einstein's work on the photoelectric effect demonstrates that light consists of quanta,or packets of light,which we now call photons.This was a pivotal contribution to the development of quantum theory.*PBS Space Time is presented and written or co-written by Dr.Matt O'Dowd,an Australian astrophysicist.

Did JWST Discover Dark Matter Stars? - YouTube - PBS Space Time - astrophysics/cosmology

The NASA/ESA/CSA James Webb Space Teslescope may have discovered a new class of objects called dark stars,which are actually very bright,bright enough for the JWST to detect them at their enormous distances,having existed just 400,000,000 years after the Big Bang.* Rules for dark matter particles to create dark stars:1.Particle cannot interact strongly with itself 2.Must have weak self-interaction 3.Must be able to annihilate each other*The self-annihilation of dark matter particles is what makes dark stars so bright.*Dark stars may have given rise to the supermassive black holes at the center of galaxies.*Dr.Matt O'Dowd is an Australian astrophysicist who is the presenter and writer or co-writer of PBS Space Time.*Cosmology is the study of the origin,evolution and structures of the universe.

Sound Waves from the Beginning of Time - YouTube - PBS Space Time - cosmology

with Dr.Matt O'Dowd PhD (astrophysics),writer and host of PBS Space Time* Cosmology is the study of the origin,evolution and structures of the universe.*The Baryonic Acoustic Oscillations are caused by pressure from photons,which are quanta,or packages of light,as Einstein put it.Photons were the radiation of the early universe.For Einstein's discovery of the photoelectric effect that underlies photons,he received the Nobel Prize in Physics.The Baryonic Acoustic Oscillations were first identified in 2005 by the Sloan Digital Sky Survey (SDSS) in the Northern Hemisphere and the 2DF Background in the Southern Hemisphere.