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  • https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Astronomy_2e_(OpenStax)/01:_Science_and_the_Universe_-_A_Brief_Tour
    1: Science and the Universe - A Brief Tour
    We gather information about the cosmos from the messages the universe sends our way. Because the stars are the fundamental building blocks of the universe, decoding the message of starlight has been …
    PHYS.LIBRETEXTS.ORG
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  • https://arxiv.org/abs/1505.03786
    Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
    All galaxies once passed through a hyperluminous quasar phase powered by accretion onto a supermassive black hole. But because these episodes are brief, quasars are rare objects typically separated by cosmological distances. In a survey for Lyman-alpha emission at redshift z ~ 2, we discovered a physical association of four quasars embedded in a giant nebula. Located within a substantial overdensity of galaxies, this system is probably the progenitor of a massive galaxy cluster. The chance probability of finding a quadruple quasar is estimated to be ~10^-7, implying a physical connection between Lyman-alpha nebulae and the locations of rare protoclusters. Our findings imply that the most massive structures in the distant universe have a tremendous supply (~ 10^11 solar masses) of cool dense (volume density ~1 cm^-3) gas, which is in conflict with current cosmological simulations.
    ARXIV.ORG
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  • https://arxiv.org/abs/astro-ph/9809058
    Radiative Transfer in a Clumpy Universe: III. The Nature of Cosmological Ionizing Sources
    The history of the transition from a neutral intergalactic medium (IGM) to one that is almost fully ionized can reveal the character of cosmological ionizing sources. We study the evolution of the volume filling factor of HII and HeIII regions in a clumpy IGM, and discuss the implications for rival reionization scenarios of the rapid decline in the space density of radio-loud quasars and of the large population of star-forming galaxies recently observed at z>3. The hydrogen component in a highly inhomogeneous universe is completely reionized when the number of photons emitted above 1 ryd in one recombination time equals the mean number of hydrogen atoms. If stellar sources are responsible for keeping the IGM ionized at z=5, the rate of star formation at this epoch must be comparable or greater than the one inferred from optical observations of galaxies at z=3, and the mean metallicity per baryon in the universe of order 1/500 solar. An early generation of stars in dark matter halos with circular velocities v_circ=50 km/s, possibly one of the main source of UV photons at high-z, could be detectable with the Next Generation Space Telescope. Models in which the quasar emissivity declines rapidly at z>3 predict a late HeII reionization epoch, a feature that could explain the recent detection of patchy HeII Lyman-alpha at z=2.9 by Reimers et al. (1997) and the abrupt change observed by Songaila (1998) at about the same epoch of the SiIV/CIV ratio, but appear unable to provide the required number of hydrogen-ionizing photons at z=5.
    ARXIV.ORG
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  • https://www.universetoday.com/
    Universe Today
    Your daily source for space and astronomy news. Expert coverage of NASA missions, rocket launches, space exploration, exoplanets, and the latest discoveries in astrophysics.
    WWW.UNIVERSETODAY.COM
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  • https://scaleofuniverse.com/
    Scale of the Universe: Discover the vast ranges of our visible and invisible world.
    Scale of Universe is an interactive experience to inspire people to learn about the vast ranges of the visible and invisible world.
    SCALEOFUNIVERSE.COM
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  • https://arxiv.org/abs/1712.01860
    An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
    Quasars are the most luminous non-transient objects known and as a result they enable studies of the Universe at the earliest cosmic epochs. Despite extensive efforts, however, the quasar ULAS J1120+0641 at z=7.09 has remained the only one known at z>7 for more than half a decade. Here we report observations of the quasar ULAS J134208.10+092838.61 (hereafter J1342+0928) at redshift z=7.54. This quasar has a bolometric luminosity of 4e13 times the luminosity of the Sun and a black hole mass of 8e8 solar masses. The existence of this supermassive black hole when the Universe was only 690 million years old---just five percent of its current age---reinforces models of early black-hole growth that allow black holes with initial masses of more than about 1e4 solar masses or episodic hyper-Eddington accretion. We see strong evidence of absorption of the spectrum of the quasar redwards of the Lyman alpha emission line (the Gunn-Peterson damping wing), as would be expected if a significant amount (more than 10 per cent) of the hydrogen in the intergalactic medium surrounding J1342+0928 is neutral. We derive a significant fraction of neutral hydrogen, although the exact fraction depends on the modelling. However, even in our most conservative analysis we find a fraction of more than 0.33 (0.11) at 68 per cent (95 per cent) probability, indicating that we are probing well within the reionization epoch of the Universe.
    ARXIV.ORG
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  • https://www.wikidata.org/wiki/Q64418453?uselang=eu
    The Last of Us universe
    fictional universe of The Last of Us video game series
    WWW.WIKIDATA.ORG
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  • https://www.scientificamerican.com/article/the-universes-invisible-hand/
    The Universe's Invisible Hand
    Dark energy does more than hurry along the expansion of the universe. It also has a stranglehold on the shape and spacing of galaxies
    WWW.SCIENTIFICAMERICAN.COM
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  • https://arxiv.org/abs/1409.2506
    On the role of GRBs on life extinction in the Universe
    As a copious source of gamma-rays, a nearby Galactic Gamma-Ray Burst (GRB) can be a threat to life. Using recent determinations of the rate of GRBs, their luminosity function and properties of their host galaxies, we estimate the probability that a life-threatening (lethal) GRB would take place. Amongst the different kinds of GRBs, long ones are most dangerous. There is a very good chance (but no certainty) that at least one lethal GRB took place during the past 5 Gyr close enough to Earth as to significantly damage life. There is a 50% chance that such a lethal GRB took place during the last 500 Myr causing one of the major mass extinction events. Assuming that a similar level of radiation would be lethal to life on other exoplanets hosting life, we explore the potential effects of GRBs to life elsewhere in the Galaxy and the Universe. We find that the probability of a lethal GRB is much larger in the inner Milky Way (95% within a radius of 4 kpc from the galactic center), making it inhospitable to life. Only at the outskirts of the Milky Way, at more than 10 kpc from the galactic center, this probability drops below 50%. When considering the Universe as a whole, the safest environments for life (similar to the one on Earth) are the lowest density regions in the outskirts of large galaxies and life can exist in only ~ 10% of galaxies. Remarkably, a cosmological constant is essential for such systems to exist. Furthermore, because of both the higher GRB rate and galaxies being smaller, life as it exists on Earth could not take place at $z > 0.5$. Early life forms must have been much more resilient to radiation.
    ARXIV.ORG
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  • https://science.nasa.gov/learning-resources/science-activation/exploring-the-universe-through-sight-touch-and-sound/
    Exploring the Universe Through Sight, Touch, and Sound
    For the first time in history, we can explore the universe through a rich blend of senses—seeing, touching, and hearing astronomical data—in ways that deepen
    SCIENCE.NASA.GOV
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  • The accelerated expansion of the universe is the observation that the expansion of the universe is accelerating, as opposed to decelerating. This accelerated expansion was first discovered in 1998 by two independent teams of astronomers, who found that distant supernovae were dimmer than expected. This observation suggested that the universe was expanding at an increasing rate, rather than at a decreasing rate as had been previously assumed. The cause of this accelerated expansion is still unknown, but it is thought to be related to a mysterious form of energy called dark energy.

    By: ChatGPT AI
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  • The accelerated expansion of the universe is a phenomenon observed in the late 1990s, where it was found that the universe is expanding at an ever-increasing rate. This phenomenon is believed to be caused by dark energy, a mysterious form of energy that makes up 68% of the universe. Dark energy appears to be pushing galaxies away from each other faster and faster over time, causing the accelerated expansion of the universe.

    By: ChatGPT AI
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  • .com

    #include <stdio.h>

    int main()
    {
    int num1, num2;

    printf("Enter two integers: "); // prompt user to enter two integers
    scanf("%d %d", &num1, &num2); // read two integers from user

    // check if both numbers are equal or not
    if (num1 == num2)
    printf("%d and %d are equal\n", num1, num2); // print if both numbers are equal

    else // if both numbers are not equal then check which number is greater
    (num1 > num2) ? printf("%d is greater than %d\n", num1, num2):printf("%d is greater than %d\n", num2, num1);

    return 0; // return 0 to operating system indicating program ran successfully
    }

    By: ChatGPT AI
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  • Exploring the Universe Through Science | What Is Astronomy?
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • “The Power of Telescopes: Exploring Space, Galaxies, and the Secrets of the Universe
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • Exclusive: Dakota Fanning Has Joined The Marvel Cinematic Universe
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  • A new supercomputer simulation animates the evolution of the universe
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  • Top 10 Mysteries Of Outer Space | Unraveling the Secrets of the Universe (Full Documentary)
    Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.
    YouTube
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  • Camera Roll
    Provided to YouTube by The Orchard Enterprises Camera Roll Jbrisko Jordan V Saffold Colossal Universe City 2021 Black 17 Media, LLC. x Colossal ...
    YouTube
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