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Thursday, June 23, 2011

NASA’s Cassini–Huygens spacecraft has discovered evidence for a large-scale saltwater reservoir beneath the icy crust of Saturn’s moon Enceladus. The data came from the spacecraft’s direct analysis of salt-rich ice grains close to the jets ejected from the moon. The study has been published in this week’s edition of the journal Nature.

Data from Cassini’s cosmic dust analyzer show the grains expelled from fissures, known as tiger stripes, are relatively small and usually low in salt far away from the moon. Closer to the moon’s surface, Cassini found that relatively large grains rich with sodium and potassium dominate the plumes. The salt-rich particles have an “ocean-like” composition and indicate that most, if not all, of the expelled ice and water vapor comes from the evaporation of liquid salt-water. When water freezes, the salt is squeezed out, leaving pure water ice behind.

Cassini’s ultraviolet imaging spectrograph also recently obtained complementary results that support the presence of a subsurface ocean. A team of Cassini researchers led by Candice Hansen of the Planetary Science Institute in Tucson, Arizona, measured gas shooting out of distinct jets originating in the moon’s south polar region at five to eight times the speed of sound, several times faster than previously measured. These observations of distinct jets, from a 2010 flyby, are consistent with results showing a difference in composition of ice grains close to the moon’s surface and those that made it out to the E ring, the outermost ring that gets its material primarily from Enceladean jets. If the plumes emanated from ice, they should have very little salt in them.

“There currently is no plausible way to produce a steady outflow of salt-rich grains from solid ice across all the tiger stripes other than salt water under Enceladus’s icy surface,” said Frank Postberg, a Cassini team scientist at the University of Heidelberg in Germany.

The data suggests a layer of water between the moon’s rocky core and its icy mantle, possibly as deep as about 50 miles (80 kilometers) beneath the surface. As this water washes against the rocks, it dissolves salt compounds and rises through fractures in the overlying ice to form reserves nearer the surface. If the outermost layer cracks open, the decrease in pressure from these reserves to space causes a plume to shoot out. Roughly 400 pounds (200 kilograms) of water vapor is lost every second in the plumes, with smaller amounts being lost as ice grains. The team calculates the water reserves must have large evaporating surfaces, or they would freeze easily and stop the plumes.

“We imagine that between the ice and the ice core there is an ocean of depth and this is somehow connected to the surface reservoir,” added Postberg.

The Cassini mission discovered Enceladus’ water-vapor and ice jets in 2005. In 2009, scientists working with the cosmic dust analyzer examined some sodium salts found in ice grains of Saturn’s E ring but the link to subsurface salt water was not definitive. The new paper analyzes three Enceladus flybys in 2008 and 2009 with the same instrument, focusing on the composition of freshly ejected plume grains. In 2008, Cassini discovered a high “density of volatile gases, water vapor, carbon dioxide and carbon monoxide, as well as organic materials, some 20 times denser than expected” in geysers erupting from the moon. The icy particles hit the detector target at speeds between 15,000 and 39,000 MPH (23,000 and 63,000 KPH), vaporizing instantly. Electrical fields inside the cosmic dust analyzer separated the various constituents of the impact cloud.

“Enceladus has got warmth, water and organic chemicals, some of the essential building blocks needed for life,” said Dennis Matson in 2008, Cassini project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

“This finding is a crucial new piece of evidence showing that environmental conditions favorable to the emergence of life can be sustained on icy bodies orbiting gas giant planets,” said Nicolas Altobelli, the European Space Agency’s project scientist for Cassini.

“If there is water in such an unexpected place, it leaves possibility for the rest of the universe,” said Postberg.

Thursday, November 29, 2018

On November 17 and November 18, Wikinews attended the 2018 Bangalore Comicbook Convention, in Karnataka, India. Beginning on Saturday morning, the ComicCon continued till Sunday. Organised by ComicCon India, who organised Comic Con in Hyderabad in October, this event was held at Karnataka Trade Promotion Organisation (KTPO)’s convention hall. Wikinews spoke to convention’s international guests Ryan O’Sullivan, Dan Watters, and Vanesa Del Ray.

UK-based freelancer comicbook writer Ryan O’Sullivan, who has worked for Image Comics and Vault Comics, and wrote video game comics including Eisenhorn, Warhammer 40,000, and Dark Souls, was one of the guests attending ComicCon. Along with him, London-based freelance comic book writer Dan Watters was also one of the attendants. Watters has worked with Image Comics on Limbo, as well as Lucifer for Vertigo Comics. Watters has also written comics for Assassin’s Creed, Wolfenstein and Deep Roots. Cuban comic book artist Vanesa Del Rey was also one of the guest attendants, who has illustrated Scarlet Witch, Daredevil Annual, and Spider-Women Alpha for Marvel Comics; and Redlands for Image Comics.

The convention started at 11 AM. Crossing between the genres of science fiction, horror, anime, fantasy and comics, the event sprawled throughout all corners of the facility. Marvel Zone, Amazon Video zone, AXN Live RED Special Session, Warner Bros’ Aquaman and Fantastic Beasts: Crimes of Grindelwald experience, and Sony Pix zone attracted large number of audience.

On day two, Sumit Kumar, creator of Chin Chin, inspired by Chacha Chaudhary and Tintin, had a panel in the afternoon.

At 1:30 PM, there was a video presentation by Yali Dream Creations. The video was about The Village. Yali Dream Creations’ Shamik Das Gupta said the story of their comic The Village is “supernatural, social, horror”. Later, there was another presentation about their other comic, Rakshak ^{((hi))Hindi language: ?Protector} — A Hero Among Us, about a masked vigilante in India. The first part of the four-part comic was released in 2016’s Delhi ComicCon, Gupta said. Gupta also added “Delhi gang rape story pushed me”. The session ended around 1:45 PM.

After Yali Dream Creations, there was a comic launch by Rahil Mohin. Mohin had previously launched Sufi Comics in 2008, The Wise Fool of Baghdad and two comics about Persian poet Rumi and now Blame it on Rahil. While he was on the panel, he was sketching cartoon, while the host was asking questions that Mohin had prepared, focused on the 90s cartoon themes. The questions were “[What was the] breed of Courage the Cowardly Dog?”, “Catchphrase of Flintstone”, and “Arch nemesis of Dexter”. His session finished by 2 PM.

At 2 PM, there was a session with AXN, and questions about AXN shows. Musician Shrey also played scores of various AXN shows on guitar, which audience had to guess. At 2:30 PM, there was a session with Cuban comic artist Vanesa Del Rey. She said it was her first convention in India, and said, “It is like any major convention in the US”. This year, Vanesa Del Rey was nominated for an Eisner Award. During the discussion, she said she wanted to do sci-fi epic,romance, mystery and thriller comics in future. Regarding romance genre in comics, she said it is “something worth exploring”. And regarding her career choice, she said her grandmother was an artist and her “family was very supportive”.

Later, there was a session with Sony PIX, with Minions appearing on the stage.

The event finished around 8 PM.