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The Physics of Space Travel: Exploring Faster-Than-Light Travel is an exhilarating journey into the world of cutting-edge science and theoretical physics. Imagine a future where interstellar travel is not just a dream, but a reality. In this comprehensive and accessible guide, you’ll dive deep into the science behind faster-than-light travel, exploring concepts like Einstein’s theory of relativity, wormholes, warp drives, and quantum tunneling.

Whether you’re a space enthusiast, a science fiction fan, or simply curious about the future of space exploration, this book breaks down complex ideas into engaging, easy-to-understand chapters. Discover the latest theories in space travel technology, the role of dark matter and dark energy, and the tantalizing possibility of time travel. Along the way, we’ll explore the search for advanced extraterrestrial civilizations and how their discoveries could guide our own journey to the stars.

With vivid explanations, real scientific insights, and thought-provoking possibilities, The Physics of Space Travel is your essential guide to understanding how humanity might one day break the light-speed barrier and unlock the mysteries of the cosmos.

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Quasars represent some of the most luminous and energetic phenomena in the universe. These distant powerhouses are driven by supermassive black holes—colossal gravitational engines with masses millions to billions of times that of our sun—which actively devour surrounding matter at incredible rates.

As gas, dust, and stellar material spiral inward through an accretion disk superheated to millions of degrees, this matter releases tremendous energy across the electromagnetic spectrum before crossing the event horizon. The resulting emissions can outshine entire galaxies despite originating from a region no larger than our solar system.

The discovery of billion-solar-mass black holes in distant quasars challenges conventional growth models in astrophysics. Scientists have observed these supermassive black holes (SMBHs) at redshifts beyond z≳6, when the universe was less than a billion years old—theoretically insufficient time for them to reach such enormous masses through standard Eddington-limited accretion from stellar-mass seeds.

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When people think of black holes, they imagine something dramatic: a star exploding in space, collapsing in on itself, and forming a cosmic monster that eats everything around it. But what if black holes didn’t always begin with a bang? What if, instead, they started quietly—growing inside stars, which still appear alive from the outside, without anyone noticing?

Our recent astrophysical research, published in Physical Review D, suggests this could be happening—and the story is far stranger and more fascinating than we imagined.

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What if black holes weren’t the only things slowly vanishing from existence? Scientists have now shown that all dense cosmic bodies—from neutron stars to white dwarfs—might eventually evaporate via Hawking-like radiation.

Even more shocking, the end of the universe could come far sooner than expected, “only” 1078 years from now, not the impossibly long 101100 years once predicted. In an ambitious blend of astrophysics, quantum theory, and math, this playful yet serious study also computes the eventual fates of the Moon—and even a human.

Black Holes Aren’t Alone

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White holes are theoretical bodies in physics that are basically time-reversed black holes, meaning instead of permanently trapping matter inside themselves, they release it constantly. Recently, one team of physicists claimed that black holes can turn into white holes, another team says they know how to detect them, and yet another group claims that white holes make up dark matter. Has the time for white holes come?

Paper: https://arxiv.org/abs/2409.

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Continue reading “Black Holes might turn into White Holes, and make up dark matter, physicists say” | >

Like a scene out of a sci-fi movie, astronomers using NASA telescopes have found “Space Jaws.” Lurking 600 million light-years away, within the inky black depths between stars, there is an invisible monster gulping down any wayward star that plummets toward it. The sneaky black hole betrayed its presence in a newly identified tidal disruption event (TDE) where a hapless star was ripped apart and swallowed in a spectacular burst of radiation.

These disruption events are powerful probes of black hole physics, revealing the conditions necessary for launching jets and winds when a black hole is in the midst of consuming a star, and are seen as bright objects by telescopes.

The new TDE, called AT2024tvd, allowed astronomers to pinpoint a wandering supermassive black hole using NASA’s Hubble Space Telescope, with similar supporting observations from NASA’s Chandra X-ray Observatory and the NRAO Very Large Array telescope that also showed that the black hole is offset from the center of the galaxy.

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Besides particles like sterile neutrinos, axions and weakly interacting massive particles (WIMPs), a leading candidate for the cold dark matter of the universe are primordial black holes—black holes created from extremely dense conglomerations of subatomic particles in the first seconds after the Big Bang.

Primordial black holes (PBHs) are classically stable, but as shown by Stephen Hawking in 1975, they can evaporate via , radiating nearly like a blackbody. Thus, they have a lifetime; it’s proportional to the cube of their initial mass. As it’s been 13.8 billion years since the Big Bang, only PBHs with an initial mass of a trillion kilograms or more should have survived to today.

However, it has been suggested that the lifetime of a black hole might be considerably longer than Hawking’s prediction due to the memory burden effect, where the load of information carried by a black hole stabilizes it against evaporation.

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As far back as we can observe in our Universe, time always behaved in exactly the same fashion we’re familiar with: ticking away, relentlessly, at the same rate for all observers. Bring your clock to the surface of the Earth? The bottom of the ocean? Into orbit in space? Near the event horizon of a black hole? Or speeding through intergalactic space at close to the speed of light? It doesn’t matter. The amount of time it takes for regular events to occur — for a second to tick by, for an atomic transition to occur, for a photon of a specific wavelength to have one “wave” pass by you, etc. — is going to be identical for any observer under any of those conditions. In fact, the rate at which time passes for themselves, at one second-per-second, is something all observers can agree on.

Sure, relativity is weird in a lot of ways, both when you move close to the speed of light or when the curvature of spacetime is very strong. Lengths contract, time durations dilate, and different observers draw different conclusions for one another versus for themselves. But time still passes, and relativity allows us to reconcile those differences. But what about if we go to an unfamiliar place; what if we consider what happens before the Big Bang? That’s what Justin Skit wants to know, asking:

“Can you help me understand what’s going on with time during cosmic inflation? I know inflation starts and then the big bang. But if the era before the big bang was timeless how does that work?”

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Catalog number: WPCR-16723
Rare and out of print.
This rare remastered audio was copied directly from the original CD and uploaded in lossless format. The only lossy conversion is YouTube’s final processing step.

0:00 In The Beginning.
1:24 Let There Be Light.
6:22 Supernova.
9:46 Magellan.
14:26 First Landing.
15:43 Oceania.
19:02 Only Time Will Tell.
23:29 Prayer For The Earth.
25:39 Lament For Atlantis.
28:22 The Chamber.
30:11 Hibernaculum.
33:43 Tubular World.
37:05 The Shining Ones.
40:05 Crystal Clear.
45:47 The Sunken Forest.
48:25 Ascension.
54:14 A New Beginning

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