Tag

Universe

All articles tagged with #universe

science12 days ago•54 min saved

The Big Bang: not an explosion, but the birth of space and time

The article explains that the Big Bang was not a violent explosion but the starting expansion of the universe, which has been growing for about 13.8 billion years. Evidence from galaxies moving apart and the Cosmic Microwave Background supports this view. Importantly, there was no space or time before the Big Bang, so asking what happened “before” is tricky. The universe’s expansion continues today and is accelerating, a behavior tied to dark energy though its nature remains not well understood.

via Yahoo|

#big-bang #cosmic-microwave-background #dark-energy

science1 month ago•19 min saved

Two Centuries of Cosmos: 20 Decades, 20 Groundbreaking Discoveries

A sweeping, decade-spanning tour of 20 landmark cosmic discoveries—from early parallax and Neptune’s discovery to the emergence of dark energy and gravitational-wave astronomy—showing how each breakthrough reshaped our understanding of the universe and spurred new questions.

via Big Think|

#astronomy #cosmology #dark-energy

science1 month ago•6 min saved

Cosmic Expansion Outpaces Light Without Violating Physics

The universe’s expansion allows distant galaxies to recede faster than light while local light-speed limits remain intact, making the observable universe extend about 45 billion light-years even though it’s 13.8 billion years old. Objects’ recession is traced by redshift, with a cosmological event horizon around 17 billion light-years that will never be crossed by light from beyond it; as dark energy accelerates expansion, this horizon grows toward ~60 billion light-years, and in roughly 100 billion years, galaxies beyond the Local Group will vanish from view.

via SciTechDaily|

#cosmology #expansion #horizon

science1 month ago•6 min saved

Cosmic Web Suggests Universe Isn’t Uniform at Largest Scales

A DESI-based map of the universe hints at anisotropy: galaxies show directional patterns that persist at gigaparsec scales, challenging the long-held cosmological principle that the cosmos is uniform and isotropic. Results are provocative but require replication with larger datasets before altering models of dark energy/matter.

via Metro.co.uk|

#anisotropy #cosmological-principle #cosmology

science1 month ago•14 min saved

Cosmic Expansion Makes the Observable Universe Bigger Than Its Age

Space itself expanded as photons traveled, so the present observable diameter is about 92–93 billion light-years even though the universe is ~13.8 billion years old. The 13.8 billion years is the lookback time, not a static travel distance; the farthest observable regions are now ~46 billion light-years away. Distances depend on cosmological definitions and parameters, such as the particle horizon, Hubble radius, and event horizon, all described within the Lambda-CDM framework and Planck data. No local light-speed limit is violated.

via Space Daily|

#cmb #cosmology #expansion

space1 month ago•6 min saved

Cosmic Web Persists Across Vast Scales, Challenging Uniformity

A Nature study analyzing 47 million galaxies from the DESI survey finds coherent patterns in the cosmic web extending across billions of light-years, suggesting the universe may not be perfectly homogeneous or isotropic on the largest scales. The result challenges a key cosmological assumption and could prompt revisions to models of dark matter, gravity, and structure formation, though independent replication with larger datasets is needed before firm conclusions.

via WIRED|

#astronomy #cosmic-web #cosmology

science2 months ago•2 min saved

Tiny Universes May Spawn Inside Collapsing Stars, Study Suggests

Researchers propose that extremely collapsed stars could halt at a gravastar stage, with outward dark-energy pressure creating a stable, tiny universe inside rather than forming a traditional black hole; the idea preserves black holes as possible outcomes but adds an exotic alternative, published in Physical Review D.

via Futurism|

#astrophysics #black-holes #dark-energy

science-and-tech2 months ago•15 min saved

One Poster Maps the Entire History of the Universe

An illustrated poster distills 13.8 billion years of cosmic history—from the end of inflation and the hot Big Bang to the formation of atoms, first stars, and the cosmic web, through to the Milky Way, dark energy, and humanity’s Moon landing—into a single image that communicates the sequence of eras and scales of the Universe.

via Big Think|

#astronomy #big-bang #cosmology

technology2 months ago•3 min saved

Big Think Teams with Pop Chart to Launch a Wall-Sized Visual History of the Universe

Big Think launched its first online store in partnership with infographic poster maker Pop Chart, selling the poster “A Visual History of the Universe” (created with astrophysicist Dr. Ethan Siegel) that visualizes the universe from the Big Bang to the present, along with related merch and announced plans for more posters in the future.

via Big Think|

#big-think #infographic #pop-chart

science3 months ago•13 min saved

Cosmic Calendar: 13.8 Billion Years in One Year, a Human Life in 0.2 Seconds

Space Daily revisits Carl Sagan’s Cosmic Calendar, compressing 13.8 billion years into one year—Big Bang on January 1, recorded history ends in the final 12–13 seconds, and a human life is about 0.2 seconds. Ongoing JWST observations and cosmological simulations (COLIBRE/FLAMINGO) are refining the timeline, but the 14-second window remains the core takeaway for perspective on humanity’s place in the cosmos.

via Space Daily|

#cosmic-calendar #cosmology #deep-time

science3 months ago•3 min saved

Physicists Divide on the Cosmos: A Major Survey Finds Little Consensus

A large American Physical Society survey of 1,600+ physicists and science enthusiasts reveals broad disagreement on core cosmology topics. While 68% view the Big Bang as a hot, dense state (not necessarily a definite beginning), 20% see it as the absolute beginning with a singularity. On dark matter, only 10% endorse the traditional WIMP view, with about 21% proposing a hybrid of ideas, and on dark energy, 24% see it as a constant while 26% think it evolves over time, per DESI. The results highlight that scientific consensus is tenuous and progress comes from continued testing and debate.

via Futurism|

#cosmology #dark-energy #dark-matter

science3 months ago•5 min saved

April’s science images spotlight a detailed 3D map of the universe and other breakthroughs

April’s best science images span cosmic to terrestrial: the DESI project delivers the most detailed 3D map of the universe from 47 million galaxies and quasars, accompanied by Earth-bound highlights such as climate-threatened cherry blossoms in Japan, the discovery of a new endangered Liopholis mutawintji skink in Australia, a lab-grown dinosaur-collagen leather bag, insights into limb regeneration, advanced 3D imaging of coral skeletons with deep learning, and NASA’s Artemis II Moon fly-by with Space Launch System boosters.

via Nature|

#biodiversity #climate-change #desi

astronomy4 months ago•5 min saved

Cosmic Collapse in 33 Billion Years: A New Model Rewrites the Universe’s Fate

A new arXiv cosmological model called the axion dark energy (aDE) framework argues that dark energy could evolve rather than stay constant, slowing the expansion until the Universe reverses into a contraction and a Big Crunch roughly 33.3 billion years from now. The model aligns with DES/DESI observations but implies a dramatic shift from the prevailing eternal-acceleration view, underscoring the need for more data to validate or refine this scenario.

via The Daily Galaxy|

#astronomy #axion #bigcrunch

science4 months ago•5 min saved

Cosmology Beyond a Theory: The Universe as a History of Ideas

Book review of Helge Kragh’s Universe argues that cosmology is a history of evolving conceptual models—from ancient Greek to modern times—emphasizing that the Universe transcends simple observation and remains partly beyond our grasp, making the field as inspirational as it is incomplete.

via Nature|

#cosmology #helge-kragh #history-of-science

science4 months ago•46 min saved

34 Mind-Blowing Space Facts You Probably Didn’t Know

BuzzFeed’s list compiles 34 bite-sized space facts—from the neutron-star density that would crush a teaspoon to the sheer size of stars like UY Scuti; eight-minute light travel from the Sun to Earth; Saturn’s density being less than water; Titan’s methane lakes; Olympus Mons on Mars; Triton’s retrograde orbit; and more cosmic quirks. It also covers human-spaceflight trivia (Apollo 11’s tiny onboard memory and post-mission quarantine), phenomena like spaghettification near black holes, planetary oddities (Mercury’s polar ice, Uranus’s extreme seasons, Pluto–Charon as a double system), and grand scales (the Sun holding ~99.8% of the solar system’s mass, the Milky Way–Andromeda collision in billions of years, and how long light from the Sun’s core takes to reach the surface). It’s a playful, educational tour through space that leaves you awed and curious about what we still have to learn.

via BuzzFeed|

#astronomy #education #note-extra-tag-not-allowed