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Scientists discover a Fossil Relic of early Milky Way harboring stars of hugely different ages

These similarities could make Terzan 5 a fossilised relic of galaxy formation, representing one of the earliest building blocks of the Milky Way

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Milky Way Galaxy. Image Source: Wikimedia Commons.

LONDON, Sept 08, 2016: An international team of researchers has found that a stellar system classified as a globular cluster for the 40-odd years since its detection actually has properties uncommon for a globular cluster that make it the ideal candidate for a living fossil from the early days of the Milky Way.

The cluster, known as Terzan 5 — 19,000 light-years from Earth- harbours stars of hugely different ages — an age-gap of roughly seven billion years and bridges the gap in understanding between our galaxy’s past and its present, the study said.

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“Such galactic fossils allow astronomers to reconstruct an important piece of the history of our Milky Way,” explained lead author of the study Francesco Ferraro from University of Bologna in Italy.

While the properties of Terzan 5 are uncommon for a globular cluster, they are very similar to the stellar population which can be found in the galactic bulge, the tightly packed central region of the Milky Way.

These similarities could make Terzan 5 a fossilised relic of galaxy formation, representing one of the earliest building blocks of the Milky Way.

“Terzan 5 could represent an intriguing link between the local and the distant Universe, a surviving witness of the Galactic bulge assembly process,” Ferraro said.

The team scoured data from the Advanced Camera for Surveys and the Wide Field Camera 3 on board Hubble, as well as from a suite of other ground-based telescopes.

They found compelling evidence that there are two distinct kinds of stars in Terzan 5 which not only differ in the elements they contain, but have an age-gap of roughly seven billion years.

The ages of the two populations indicate that the star formation process in Terzan 5 was not continuous, but was dominated by two distinct bursts of star formation.

“This requires the Terzan 5 ancestor to have large amounts of gas for a second generation of stars and to be quite massive. At least 100 million times the mass of the Sun,” co-author of the study Davide Massari from National Institute for Astrophysics (INAF) , Italy.

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Its unusual properties make Terzan 5 the ideal candidate for a living fossil from the early days of the Milky Way, said the study published in the Astrophysical Journal.

Somehow Terzan 5 has managed to survive being disrupted for billions of years, and has been preserved as a remnant of the distant past of the Milky Way.

The researchers believe that this discovery paves the way for a better and more complete understanding of galaxy assembly. (IANS)

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London, Paris, Bangkok- Top 3 Travel Destinations in the Past Decade

Bangkok, London, Paris top 3 travel destinations of decade says a new report

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Paris is one among the most travelled cities in the world. Pixabay

While there has been significant movement in visitors to smaller cities, the top 10 have remained largely consistent over the past decade, with London, Paris and Bangkok grabbing the top three spots, according to a new report.

The top three overseas destinations for Indian travellers are Dubai, Singapore and Mecca, revealed the Mastercard Global Destination Cities Index 2019 which ranks 200 cities based on proprietary analysis of publicly available visitor volume and spend data.

Since 2009, the number of international overnight visitors grew an astounding 76 per cent, according to the report.

In 2019, Bangkok became the No. 1 destination for the fourth consecutive year, with more than 22 million international overnight visitors.

Paris and London, in flipped positions this year, hold the No. 2 and 3 spots respectively, both hovering over 19 million.

When looking at the cities by dollars spent, Dubai tops the list with travellers spending $553 on an average per day. Mecca, new to the top 10 last year, remains at No. 2 for the second consecutive year, with Bangkok rounding out the top three.

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Paris and London, in flipped positions this year, hold the No. 2 and 3 spots respectively, both hovering over 19 million. Pixabay

Between all of the destinations within the Index, arrivals have grown on average 6.5 per cent year-over-year since 2009, with expenditure growing on average 7.4 per cent, said the report.

Cities in the Asia-Pacific region have seen the largest increase in international travellers since 2009, growing 9.4 per cent.

Also Read- Here Are The Ways In Which Technology Has Improved Travelling

In comparison, Europe, which saw the second highest growth, was up 5.5 per cent.

This is spurred by the growth in Chinese travellers. Since 2009, China has jumped up six places to be the No. 2 origin country for travellers to the 200 included destinations – behind only the US, said the report. (IANS)