An artist's impression of an exoplanet's atmosphere evaporating into space. Courtesy: Nasa
An artist's impression of an exoplanet's atmosphere evaporating into space. Courtesy: Nasa
An artist's impression of an exoplanet's atmosphere evaporating into space. Courtesy: Nasa
An artist's impression of an exoplanet's atmosphere evaporating into space. Courtesy: Nasa

Can we live on distant planets? NYU Abu Dhabi study determines habitability


Sarwat Nasir
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Researchers in Abu Dhabi are studying how a planet's relationship with its host star can affect its ability to support life.

A new study by NYU Abu Dhabi found that emissions from host stars can strip away the atmosphere of planets orbiting them. Scientists believe that planets with no atmosphere are uninhabitable.

Results of the study were published in the Monthly Notices of Royal Astronomical Society: Letters journal this month and led by research scientist Dr Dimitra Atri with involvement from graduate student Shane Carberry Mogan.

After looking at 493 host stars outside our solar system, it was found that extreme ultraviolet radiation and stellar flares from some categories of host stars can destroy the upper atmosphere of planets orbiting them.

"We have identified exoplanets in the M0 to M4 [host stars] category are least likely to be habitable, because their atmospheres will be completely eroded by extreme ultraviolet radiation," Dr Atri told The National.

So far, scientists have discovered 4,000 planets around more than 3,000 host stars, none of which have shown habitable conditions similar to Earth's.

To find distant planets that can support life, researchers look at planets in habitable zones known as the Goldilocks Zone. This is a zone where planets are not too close or too far from their host star, allowing it to sustain water.

For example, Earth is far enough from its host star, the Sun, to avoid radiation, yet close enough to stay warm.

“Given the close proximity of exoplanets to host stars, it is vital to understand how space weather events tied to those stars can affect the habitability of the exoplanet,” Dr Atri said.

His study showed that lighter stars that get less excessive radiation have more chances of having habitable planets orbiting them.

The findings could help scientists take a host star’s radiation levels into account when trying to determine an exoplanet’s ability to support life.

Dr Atri used data from Nasa’s Transiting Exoplanet Survey Satellite observatory for his study.

“The next research step would be to expand our data set to analyse stellar flares from a larger variety of stars to see the long-term effects of stellar activity, and to identify more potentially habitable exoplanets,” he said.

Dr Atri also hopes to use data from UAE’s Emirates Mars Mission to analyse how the Red Planet lost most of its atmosphere.

Scientists believe the planet once supported ancient life.

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Indoor cricket in a nutshell

Indoor Cricket World Cup – Sep 16-20, Insportz, Dubai

16 Indoor cricket matches are 16 overs per side

8 There are eight players per team

There have been nine Indoor Cricket World Cups for men. Australia have won every one.

5 Five runs are deducted from the score when a wickets falls

Batsmen bat in pairs, facing four overs per partnership

Scoring In indoor cricket, runs are scored by way of both physical and bonus runs. Physical runs are scored by both batsmen completing a run from one crease to the other. Bonus runs are scored when the ball hits a net in different zones, but only when at least one physical run is score.

Zones

A Front net, behind the striker and wicketkeeper: 0 runs

B Side nets, between the striker and halfway down the pitch: 1 run

Side nets between halfway and the bowlers end: 2 runs

Back net: 4 runs on the bounce, 6 runs on the full