Thiruvananthapuram Current Affairs - 2019

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New population of Ultraviolet Stars Identified in the Globular Cluster NGC 2808

Astronomers from Thiruvananthapuram and Mumbai have identified a new population of ultraviolet stars in the globular cluster NGC 2808 using the Indian multi-wavelength space observatory AstroSat, launched in September 2015.

AstroSat

AstroSat is India’s dedicated multi-wavelength space observatory which endeavours for a more detailed understanding of our universe. ASTROSAT observes the universe in the optical, Ultraviolet, low and high energy X-ray regions of the electromagnetic spectrum. Major astronomy Institutions and some Universities in India are participating in these observations.

NGC 2808

Globular clusters are collections of thousands to millions of stars, moving as one unit. These stars are tightly held together by the gravity of the cluster itself and are believed to have formed together at roughly the same time.  The globular cluster contains stars with a variety of masses but with similar chemical composition.

NGC 2808 is one of the massive globular clusters and is located at a distance of 47,000 light years from us.

Recent studies have shown that many globular clusters may well host more than one population of stars contrary to popular belief that all stars in such clusters are of the same age. Observations suggest that NGC2808 may have at least five different populations of stars.

GSI Sets Up 22 GPS Stations across Country

The Geological Survey of India (GSI) has launched 22 permanent global positioning system (GPS) stations across India to identify seismically hazardous zones and encourage mapping activities.

These 22 stations are part of the 35 stations planned by GSI to establish and maintain a network of continuously operating 35 permanent GPS stations.

Fact Box: Bhuvisamvad

Bhuvisamvad is an app launched by the Ministry of Mines to facilitate interaction between geo-scientists and university and college students.

GPS stations

22 stations inaugurated are based at Kolkata, Thiruvananthapuram, Jaipur, Pune, Dehradun, Chennai, Jabalpur, Bhubaneswar, Patna, Raipur, Bhopal, Chandigarh, Gandhinagar Vishakhapatnam, Agartala, Itanagar, Mangan, Jammu, Lucknow, Nagpur, Shillong and Little Andaman.

13 More Stations Would come up at Aizawl, Faridabad, Uttarkashi, Pithoragarh, Cooch Behar, Zawar, North Andaman, Middle Andaman, South Andaman, Ranchi, Mangalore, Imphal and Chitradurga.

These stations are meant to delineate high strain zones for earthquake probability, determine a seismic motion on faults that may lead to a rupture and produce thematic maps with high positional accuracy.

Geological Survey of India

Geological Survey of India (GSI) was established in 1851 primarily to find coal deposits for the Railways. Over the years GSI  has not only grown into a repository of geoscience information required in various fields in the country but has also attained the status of a geo-scientific organisation of international repute.

The main functions of GSI attached to the Ministry of Mines is to create and update of national geoscientific information and mineral resource assessment through ground surveys, airborne and marine surveys, mineral prospecting and investigations, multi-disciplinary geoscientific, geotechnical, geo-environmental and natural hazards studies, glaciology, seismotectonic study, and carrying out fundamental research.