And see how extreme orbits could give future ships enormous speed boosts.
Category: cosmology
Are We Living Inside a Hologram? | Jim Al-Khalili’s Guide To Life
Jim Al-Khalili explores the revolutionary discoveries that transformed modern physics. From Einstein’s General Theory of Relativity and the expanding universe to the bizarre world of quantum mechanics, black holes, entanglement, and the search for a Theory of Everything, this episode examines the ideas that continue to redefine our understanding of space, time, and reality itself. It concludes with one of the boldest concepts in theoretical physics—that the universe may actually be a giant hologram.
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Scientists Solve The 40-Year Mystery of a Giant Structure Towering Over The Milky Way
Scientists have just discovered the Milky Way’s equivalent of a giant fake mustache.
For four decades, astronomers have puzzled over a giant loop apparently ballooning out of the center of the Milky Way.
Known as the Galactic center lobe (GCL), the structure has been blamed on everything from the aftermath of a supernova to an ancient eruption from the Milky Way’s core – so many competing explanations that one team described it as “a Rorschach test for Galactic astrophysics.”
Most Of The Universe Is Missing And We Don’t Know Why
Everything you see, touch and are built from is a minority of what the universe is actually made of, and the closer physics looks at the rest, the less the picture holds together. Over the next 3 hours, we move outwards through that problem: from the 85 per cent of matter that is invisible, to the visible matter whose textbook description is admittedly unfinished, to a dimension of space that scientists are now building by hand in a lab, and finally to the question of whether we can ever truly know what reality is made of at all.
Watch our interview with Dark Energy Researcher, Tessa Baker: • What If Dark Energy Comes From Space-Time…
00:00:00 Intro.
00:01:39 We May Be Wrong About Dark Matter.
00:31:38 Frank Close: We Were Wrong About Matter.
01:39:09 Scientists Build A Window Into The Fourth Dimension.
02:01:37 Sean Carroll: We May Never Understand Reality.
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Listening to ‘ringing’ black holes unlocks future gravitational-wave astronomy
Listening to the “ringing” produced by black holes after they collide and merge could allow scientists to test Einstein’s theory of general relativity under the most extreme conditions in the universe while unlocking the secrets of these mysterious objects.
Leading a major international review with the Institute of Physics, astrophysicists at the University of Birmingham, Johns Hopkins University and Instituto Superior Técnico of Lisbon show how black hole “spectroscopy” is rapidly evolving from a theoretical concept into a powerful experimental science. The work is published in the journal Classical and Quantum Gravity.
During the “ringdown” phase following a collision and merger, a newly formed black hole emits characteristic gravitational-wave vibrations known as “quasinormal modes.” By measuring these frequencies, scientists can determine the black hole’s mass and how fast it is spinning, as well as investigate whether Einstein’s theory is correct.
A new stellar census strengthens the case for a 13.8-billion-year-old universe
Astronomers have used the ages of more than 155,000 stars in the Milky Way to independently estimate the age of the universe, and their findings may be good news for the standard cosmological model. The new research was reported in a paper submitted to the arXiv preprint server on July 1.
The age of the universe is tied to a discrepancy known as the Hubble tension. There are two main ways to measure how fast the universe is expanding, known as the Hubble constant. The first uses the cosmic microwave background (CMB), the “afterglow” of the Big Bang, and gives a certain value. The other uses local measurements in our cosmic neighborhood, including Cepheid stars and supernovae, and gives a noticeably higher value.
The two figures disagree by about 9%—a mismatch known as the Hubble tension.