How sun sets in an alien world
Washington: Scientists have thrown light on how sunsets on exoplanets would look like.
According to University of Exeter exoplanetary scientist Frederic Pont, as exoplanet planet HD 209458 b - unofficially known as “Osiris”, a world 150 light-years from Earth, orbits extremely close to its star, atmospheric temperatures are high (around 1,000 degrees Celsius or 1,800 degrees Fahrenheit).
This implies that its outer atmospheric layers become “puffed up.”
The exoplanet’s atmospheric “puffiness” makes it easier to analyze, and using data from the STIS spectrograph on the Hubble Space Telescope, Pont was able to calculate how the star would look as seen at the exoplanet’s horizon, Discovery News reported.
In the case of Osiris, as its star drops through the atmosphere from an observer’s perspective, it will transform from predominantly white to blue.
The blueness is due to atmospheric sodium absorbing the orange/red light being emitted by the star, causing its light to shift towards the blue part of the spectrum.
As the star drops further, Rayleigh scattering by atmospheric molecules will disperse even the blue light from the star. (Rayleigh scattering is the same mechanism that gives Earth`s sky a blue hue.)
The only light able to make it through the atmosphere will be green and ultimately murky brown. The atmosphere will then glow because of emission from atmospheric molecules and the Rayleigh scattering will cause a blue hue to stay on.
More from India
More from World
More from Sports
More from Entertaiment
- Olympic bronze medallist Sakshi Malik returns home from Rio to grand welcome!
- Rahul Gandhi takes U-turn, says never blamed RSS for Gandhi's assassination
- Secret documents on Indian Navy's Scorpene-class submarine leaked
- PM Modi's photos, Indian flags raised during massive protests in Balochistan
- Did India become victim of Scorpene submarine conspiracy?
- Turkey will give full support to operation to retake Syria's Jarablus from Islamic State: Foreign Minister Mevlut Cavusoglu
- WATCH: What is PV Sindhu's equation with Saina Nehwal? Her reply will surprise you
- Iraq executions carried out without proper trial, fuelled by vengeance: UN
- India to buy 500 helicopters, 12 submarines, over 200 fighter jets in next 10 years: Report
- Pakistan denies Dawood's presence in Karachi, says 'UN report motivated by India's aim to malign us'