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Scientists on NASA's IceBridge mission photographed an oblique view of the massive rift in the Antarctic Peninsula's Larsen C ice shelf, Nov. 16, 2016. VOA
  • The iceberg, which is likely to be named A68, measures 5,800 square kilometers and weighs over one trillion tons, making it one of the biggest on record
  • Iceberg calving, when bergs break away from a larger ice sheet, is a natural process, although global warming is believed to have accelerated the trend

July 13, 2017: Scientists say an iceberg the size of Bali has broken away from the continent of Antarctica.

The iceberg, which is likely to be named A68, measures 5,800 square kilometers and weighs over one trillion tons, making it one of the biggest on record. It is slightly larger than the Indonesian island of Bali, which has a population of well over 4 million people.


ALSO READ: India to prepare a Law to safeguard its interest in Antarctica

Iceberg calving, when bergs break away from a larger ice sheet, is a natural process, although global warming is believed to have accelerated the trend. This new mass of free-floating ice has been separating from Antarctica’s Larsen C Ice Shelf for months.


Iceberg in Antarctica. VOA

Scientists say there is no immediate impact on global sea levels, but the huge iceberg is a risk to ships in the area. The extreme south Atlantic is outside major maritime trade routs, but Antarctica is is a popular destination for cruise ships, most of them traveling from South America.

The Larsen C ice shelf is still attached to land, but already largely afloat off the coast of northwestern Antarctica. It is one in a series of three connected formations that grew out from the Antarctic mainland over tens of thousands of years.

Larsen A, the most northern and smallest of the three segments, broke free of the mainland in 1995. The Larsen B Ice Shelf, somewhat larger at about 3,200 square km, with an average ice thickness of 220 meters, disintegrated into the sea in 2002. (VOA)


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NASA's Chandra X-ray Observatory has for the first time spotted signs of a planet transiting a star outside of the Milky Way galaxy, opening up a new avenue to search for exoplanets at greater distances than ever before.

The possible exoplanet -- or planets outside of our Solar System -- candidate is located in the spiral galaxy Messier 51 (M51), also called the Whirlpool Galaxy because of its distinctive profile, NASA said in a statement.

Astronomers have, so far, found all other known exoplanets and exoplanet candidates in the Milky Way galaxy, almost all of them less than about 3,000 light-years from Earth.

An exoplanet in M51 would be about 28 million light-years away, meaning it would be thousands of times farther away than those in the Milky Way, NASA said.

"We are trying to open up a whole new arena for finding other worlds by searching for planet candidates at X-ray wavelengths, a strategy that makes it possible to discover them in other galaxies," said Rosanne Di Stefano of the Center for Astrophysics at Harvard and Smithsonian (CfA) in Cambridge, Massachusetts, who led the study.

The findings are published in the journal Nature Astronomy.

The exoplanet candidate was spotted in a binary system called M51-ULS-1, located in M51. This binary system contains a black hole or neutron star orbiting a companion star with a mass about 20 times that of the Sun. The X-ray transit they found using Chandra data lasted about three hours, during which the X-ray emission decreased to zero.

Based on this and other information, the team estimates the exoplanet candidate in M51-ULS-1 would be roughly the size of Saturn and orbit the neutron star or black hole at about twice the distance of Saturn from the Sun.

The team looked for X-ray transits in three galaxies beyond the Milky Way galaxy, using both Chandra and the European Space Agency's XMM-Newton. Their search covered 55 systems in M51, 64 systems in Messier 101 (the "Pinwheel" galaxy), and 119 systems in Messier 104 (the "Sombrero" galaxy).

However, more data would be needed to verify the interpretation as an extragalactic exoplanet. One challenge is that the planet candidate's large orbit means it would not cross in front of its binary partner again for about 70 years, thwarting any attempts for a confirming observation for decades, NASA said.

Named in honor of the late Indian-American Nobel laureate, Subrahmanyan Chandrasekhar, the Chandra X-ray Observatory is the world's most powerful X-ray telescope. It has eight times greater resolution and is able to detect sources more than 20-times fainter than any previous X-ray telescope.

Known to the world as Chandra (which means "moon" or "luminous" in Sanskrit), Chandrasekhar was widely regarded as one of the foremost astrophysicists of the twentieth century. (IANS/JB)


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