The California Nebula is an emission nebula located in the constellation Perseus. [**]

Unusual flashes of gamma rays could reveal that what appear to be giant black holes are actually huge wormholes, a new study finds.

Wormholes are tunnels in space-time that can theoretically allow travel anywhere in space and time, or even into another universe. Einstein's theory of general relativity suggests wormholes are possible, although whether they really exist is another matter.

In many ways, wormholes resemble black holes. Both kinds of objects are extremely dense and possess extraordinarily strong gravitational pulls for bodies their size. The main difference is that no object can theoretically come back out after crossing a black hole's event horizon — the threshold where the speed needed to escape the black hole's gravitational pull exceeds the speed of light — whereas any body entering a wormhole could theoretically reverse course.

Assuming wormholes might exist, researchers investigated ways that one might distinguish a wormhole from a black hole. They focused on supermassive black holes with masses millions to billions of times that of the sun, which are thought to dwell at the hearts of most, if not all, galaxies. For example, at the center of our Milky Way galaxy lies Sagittarius A*, a monster black hole that is about 4.5 million solar masses in size.

Anything entering one mouth of a wormhole would exit out its other mouth. The scientists reasoned that meant that matter entering one mouth of a wormhole could potentially slam into matter entering the other mouth of the wormhole at the same time, a kind of event that would never happen with a black hole.

Any matter falling into a mouth of a supermassive wormhole would likely travel at extraordinarily high speeds due to its powerful gravitational fields. The scientists modeled the consequences of matter flowing through both mouths of a wormhole to where these mouths meet, the wormhole's "throat." The result of such collisions are spheres of plasma expanding out both mouths of the wormhole at nearly the speed of light, the researchers said.

"What surprises me most of all is that no one has proposed this idea before, because it is rather simple," study lead author Mikhail Piotrovich, an astrophysicist at the Central Astronomical Observatory in Saint Petersburg, Russia, told Space.com.

The researchers compared the outbursts from such wormholes with those from a kind of supermassive black hole known as an active galactic nucleus (AGN), which can spew out more radiation than our entire galaxy does as they devour matter around them, and do so from a patch of space no larger than our solar system. AGNs are typically surrounded by rings of plasma known as accretion disks and can emit powerful jets of radiation from their poles.

November 10, 2009

In celebration of the International Year of Astronomy 2009, NASA's Great Observatories — the Hubble Space Telescope, the Spitzer Space Telescope, and the Chandra X-ray Observatory — have collaborated to produce an unprecedented image of the central region of our Milky Way galaxy.

Credit: X-ray: NASA/CXC/UMass/D. Wang et al.; Optical: NASA/ESA/STScI/D.Wang et al.; IR: NASA/JPL-Caltech/SSC/S.Stolovy

In this spectacular image, observations using infrared light and X-ray light see through the obscuring dust and reveal the intense activity near the galactic core. Note that the center of the galaxy is located within the bright white region to the upper middle of the image (this is also Sagitarrius A). In the non rotated image, the entire image width covers about one-half a degree, about the same angular width as the full moon.

Each telescope's contribution is presented in a different color:

Yellow represents the near-infrared observations of Hubble. They outline the energetic regions where stars are being born as well as reveal hundreds of thousands of stars.

Red represents the infrared observations of Spitzer. The radiation and winds from stars create glowing dust clouds that exhibit complex structures from compact, spherical globules to long, stringy filaments.

Blue and violet represents the X-ray observations of Chandra. X-rays are emitted by gas heated to millions of degrees by stellar explosions and by outflows from the supermassive black hole in the galaxy's center. The bright blue blob on the left side of the full field image is emission from a double star system containing either a neutron star or a black hole.

Native American myths, legends and oral traditions are rich with stories of giant beings existing in ancient times. They all talk of giant Thunderers or Thunder-beings, giant snakes and great Thunderbirds. Even the first humans were said to be giants, some half man, half animal. The Tsistsistas (Cheyenne) have a name for the giant beings that their ancestors encountered during the early migration to the grasslands of the Great Plains. They called them haztova hotoxceo or “two-faced star people”. Other Plains tribes such as the Black Feet, Gros Ventres and Lakota have similar stories.

These old stories may have real world counterparts. Discovered in a prehistoric effigy-mound group (the Kolterman Mounds) in south-eastern Wisconsin (U.S.A.) is a human-like petroform or lithic effigy with a serpentine body and wing-like arms known as the ‘Star-being’. Configured in stone, it is approximately 20 metres in length with a red coloured, bison-shaped headstone aligned to face the summer solstice sunrise. However, it is not a lone or singular occurrence. The ‘Star-being’ is but one of two human-like petroform effigies discovered in south-eastern Wisconsin. There is another of almost the same size called the Starman which also has a red coloured, bison-shaped headstone aligned to face the summer solstice sunrise. Both the Starman and Star-Being lithic complexes are codified by the State Historical Society of Wisconsin as archaeological sites of Archaic age.

Each giant lithic effigy appears to be a reflection of certain constellations and stars. The ‘Star-being’ is a mirror-image of the (western) constellations of Scorpius and Libra (with Sagittarius); the Starman is an almost exact representation of Taurus and the Pleiades. Both giant effigies are estimated to be 3500-6000 years old, embodiments of ancient legends and traditions writ large in stone and connected to ‘The People’ through ceremony and acts of cosmic renewal.