background preloader

Cosmic mapping

Facebook Twitter

The Scale of the Universe. Celestial event. Cosmic Spider Swallows Starlight in Amazing Telescope View (Video, Photos) A dark, spider-shaped cloud of cosmic gas blocks out light from stars in a new image taken by a telescope in the Southern Hemisphere.

Cosmic Spider Swallows Starlight in Amazing Telescope View (Video, Photos)

The amazing photo, taken by a telescope at the European Southern Observatory's La Silla Observatory in Chile, is filled with stars glowing brightly in a variety of colors. Red, blue, yellow and orange stars frame the gas blob called Lupus 4, which blots out light from other, more distant stars in the center of the image. Fly through the image in a new video of the Lupus 4 space cloud from ESO. Eventually, Lupus 4, which is located about 400 light-years from Earth, could give birth to its own stars. [Star Quiz: Test Your Stellar Smarts] A dark cloud of gas called Lupus 4 blocks out more-distant stars. "How many stars might eventually start to shine within Lupus 4? Welcome To Our New Galactic Supercluster Home: Laniakea. Your ultimate address just changed.

Welcome To Our New Galactic Supercluster Home: Laniakea

Astronomers have discovered that the supercluster we’ve long-believed our Milky Galaxy resides in is actually just an appendage on the outskirts of an even more giant new supercluster called Laniakea. Every now and then we receive an email from someone who lists their address in a much more complete way than most everyone else does. From Quark to Quasar: The Observable Universe. “That tiny dot that you can hardly make out in the screen is the Virgo Supercluster, where our galaxy, our local group and several others reside.

From Quark to Quasar: The Observable Universe

All of those other dots are superclusters, each containing perhaps trillions of stars. Via WikiMedia If you really want a headache (the good kind), take a long look at this “photo”. First Planck results: the Universe is still weird and interesting. Our current model of cosmology—the origin and structure of the whole Universe—has survived another major test, with the release of the first 15 months of data from the Planck mission.

First Planck results: the Universe is still weird and interesting

Planck is a European Space Agency mission, designed to study the cosmic microwave background (CMB), which preserves information about the conditions that persisted immediately after the Big Bang. Combined with results from prior experiments, Planck has revealed a Universe a little older than previously thought, and with a slightly different balance of ingredients. Although there were no major surprises, some of its data provided stronger hints about inflation, a popular model that explains why the modern Universe looks the way it does. Other measurements ruled out extra neutrinos, provided even stronger evidence for the existence (though not the identity) of dark matter, and indicated that there's a bit less dark energy than previous measurements had suggested. That image helps tell us the Universe's age. Astrometry. Illustration of the use of interferometry in the optical wavelength range to determine precise positions of stars.

Astrometry

Courtesy NASA/JPL-Caltech. Better Not Avoid A Cosmic Void. (Inside Science) -- Sometimes nothingness can reveal a whole lot.

Better Not Avoid A Cosmic Void

3D Galactic Map May Solve Interstellar Puzzle. Universal Formula for Cosmic Voids. +Enlarge image N.

Universal Formula for Cosmic Voids

Hamaus/Paris Inst. of Astrophys. & M. Warren/Los Alamos National Lab Most of the matter in the Universe consists of the mysterious dark matter, and cosmologists would like to better understand how it is organized in space. Writing in Physical Review Letters, a team presents detailed computer simulations of the large-scale, bubble-like voids that exist in dark matter. Scarcely anything is known about dark matter except that, apart from its gravitational effects, it hardly interacts with ordinary matter or light. Earlier simulations have shown that a uniform dark matter “gas” collapses under its own gravity into a tangled web of sheets and filaments that is permeated by relatively empty voids [1, 2].

The MareNostrum Universe. Mystery of cosmic rays' origin finally solved - physics-math - 14 February 2013. Video: Stellar cataclysm The protons that constantly smack into Earth's atmosphere at near the speed of light get their huge energies from exploding stars.

Mystery of cosmic rays' origin finally solved - physics-math - 14 February 2013

At least that's what physicists and astronomers had long suspected, but direct evidence for the idea has been difficult to come by – until now. Cosmic rays are any charged particles arriving at Earth from space. Nearly all of them are protons, and some have been accelerated to speeds higher than any achieved by a particle accelerator on Earth. Although we have known about cosmic rays since 1912, their origins have remained a puzzle.

"It's a 100-year-old mystery," says Stefan Funk of the SLAC National Accelerator Laboratory in Menlo Park, California. Physicists suspected that one possible source was the violent outburst of a supernova within the Milky Way. "Eventually their energy gets large enough that they can leave the shock region," Funk says. Total scramble. CMB. Cosmic Background Radiation :

CMB

The-Observable-Universe.jpg (JPEG Image, 3850x1925 pixels) - Scaled (27%) Planetarium - Interactive star map and virtual sky. Interactive Star Charts, Planets, Meteors, Comets, Telescopes. 32 Nearby Stars. Chronology of Cosmic Microwave Background Astronomy. Chronology of Galaxies, Clusters of Galaxies, and Large Scale Structure.

Chronology of Astronomical Maps. Forensic astronomy. Forensic astronomy is the use of astronomy, the scientific study of celestial objects, to determine past celestial constellations.

Forensic astronomy

This has been used, if relatively rarely, in forensic science (that is, for solving problems of relevance to the legal system) and for resolving historical problems more generally, notably issues in art history. Forensic science[edit] As a forensic science in the strict sense of the term, astronomical knowledge can help resolve certain legal questions. In one reported instance, an astronomer testified in court as an expert witness as to whether a newly built house would cast a shadow on another house. Observable universe. The surface of last scattering is the collection of points in space at the exact distance that photons from the time of photon decoupling just reach us today. These are the photons we detect today as cosmic microwave background radiation (CMBR).

However, with future technology, it may be possible to observe the still older neutrino background, or even more distant events via gravitational waves (which also should move at the speed of light). Sometimes astrophysicists distinguish between the visible universe, which includes only signals emitted since recombination—and the observable universe, which includes signals since the beginning of the cosmological expansion (the Big Bang in traditional cosmology, the end of the inflationary epoch in modern cosmology). The universe versus the observable universe[edit] If the universe is finite but unbounded, it is also possible that the universe is smaller than the observable universe.

Size[edit] Misconceptions[edit] 13.8 billion light-years.

Cosmic scale

What is the Universe Expanding Into?‬‏