NASA, the National Aeronautics and Space Administration, is the United States government agency responsible for the nation’s civilian space program and for aeronautics and aerospace research. Established in 1958 by the National Aeronautics and Space Act, NASA has led the U.S. in space exploration efforts, including the Apollo moon-landing missions, the Skylab space station, and the Space Shuttle program.
A new way to study 3D maps of galaxies in the cosmos without compressing the data is revealing new information about the dark universe.
The Theory of Relativity, published in 1905 by Albert Einstein, postulated the existence of gravitational waves—oscillations of the space-time fabric—and more than a century later, we have irrefutable evidence of it. Now, a new study has managed to find clear indications of relativistic procession in the orbits of two colliding black holes.
Some scientists think that dark energy could be a sort of defect in the fabric of the universe itself; defects like cosmic strings, which are hypothetical one-dimensional “wrinkles” thought to have formed in the early universe.
Some scientists think that dark energy isn’t something physical that we can discover. Rather, they think there could be an issue with general relativity and Einstein’s theory of gravity and how it works on the scale of the observable universe. Within this explanation, scientists think that it’s possible to modify our understanding of gravity in a way that explains observations of the universe made without the need for dark energy. Einstein actually proposed such an idea in 1919 called unimodular gravity, a modified version of general relativity that scientists today think wouldn’t require dark energy to make sense of the universe.
Dark energy is one of the great mysteries of the universe. For decades, scientists have theorized about our expanding universe. Now, for the first time ever, we have tools powerful enough to put these theories to the test and really investigate the big question: “what is dark energy?”
A new study has revealed the universe is expanding too quickly for our current understanding of physics to explain.
The expansion of the universe is described using a unit of measurement called the Hubble constant. Determining the universe’s expansion rate has been a major point of intrigue since 1929, when Edwin Hubble first discovered that our universe is expanding.
The universe began with the Big Bang, a rapid expansion from an initial state of high density and pressure.
Have you ever looked up at the night sky and wondered what you’re not seeing? The skies may be full of invisible “boson stars” that are made of an exotic form of matter that does not shine.
We strongly suspect that the universe is full of dark matter, which makes up around 25% of all the mass and energy in the cosmos. But while circumstantial evidence abounds and we believe that dark matter is some sort of undiscovered particle, we don’t have any direct evidence of such a particle.
Could our entire Universe be one enormous Black Hole? And is it possible to live inside a black hole?
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/ discord Credits: Do We Live Inside A Black Hole… And Could We? Science & Futurism with Isaac Arthur Episode 374, December 22, 2022 Produced & Narrated by Isaac Arthur Produced, Written & Narrated by: Isaac Arthur Editors: Briana Brownell Lukas Konecny Cover Art by: Jakub Grygier Graphics by: Jeremy Jozwik Ken York Music Courtesy of Epidemic Sound http://epidemicsound.com/creator.
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Credits:
Do We Live Inside A Black Hole… And Could We?
Science & Futurism with Isaac Arthur.
Episode 374, December 22, 2022
Produced & Narrated by Isaac Arthur.
Produced, Written.
& Narrated by:
Isaac Arthur.
Editors:
Briana Brownell.
Lukas Konecny.
Cover Art by:
New observations from the National Science Foundation National Radio Astronomy Observatory’s (NSF NRAO) Karl G. Jansky Very Large Array (NSF VLA) provide compelling evidence supporting a universal mechanism for the collimation of astrophysical jets, regardless of their origin.
The new study, published in The Astrophysical Journal Letters, reveals the presence of a helical magnetic field within the HH 80–81 protostellar jet, a finding that mirrors similar structures observed in jets emanating from supermassive black holes.
Jets, powerful, highly collimated outflows of matter and energy, are observed across a vast range of scales in the universe. From the supermassive black holes at the centers of galaxies to the young stars in our own Milky Way, these jets play a crucial role in the evolution of their host systems. However, the precise mechanism that guides these jets and prevents them from dispersing into space has remained a long-standing puzzle.
Detecting dark matter particles and understanding their underlying physics is a long-standing research goal for many researchers worldwide. Dark matter searches have been aimed at detecting different possible signals that could be associated with the presence of these elusive particles or with their interaction with regular matter.
A promising technology for conducting dark matter searches is the SENSEI (Sub-Electron Noise Skipper-CCD experimental instrument) detector, a highly sensitive imaging sensor located at the SNOLAB research facility in Canada.
The research group analyzing data collected by this detector, dubbed the SENSEI collaboration, have published the results of their first search for sub-GeV dark matter at SNOLAB in the journal Physical Review Letters.
Detecting dark matter, the elusive type of matter predicted to account for most of the universe’s mass, has so far proved to be very challenging. While physicists have not yet been able to determine what exactly this matter consists of, various large-scale experiments worldwide have been trying to detect different theoretical dark matter particles.
One of these candidates is so-called light dark matter (LDM), particles with low masses below a few giga-electron volts (GeV/c2). Theories suggest that these particles could weakly interact with ordinary matter, yet the weakness of these interactions could make them difficult to detect.
The NEON (Neutrino Elastic Scattering Observation with Nal) collaboration, a group of researchers analyzing data collected by the NEON detector at the Hanbit nuclear reactor in South Korea, have published the results of their first direct search for LDM.
