The other blue planet: HD 189733b's stunning azure hue revealed by Hubble telescope for first time
Deep cobalt colouring comes from drops of liquid gas raining horizontally in 7,000 km/h winds
Steve Connor is the Science Editor of The Independent and i. He has won many awards for his journalism, including five-times winner of the prestigious British science writers’ award; the David Perlman Award of the American Geophysical Union; four times highly commended as specialist journalist of the year in the UK Press Awards; UK health journalist of the year and a special merit award of the European School of Oncology for his investigations into the tobacco industry. He has a degree in zoology from the University of Oxford and has a special interest in genetics and medical science, human evolution and origins, climate change and the environment.
Thursday 11 July 2013
We are not alone. Scientists have discovered a second blue planet in the Universe, although this one is decidedly inhospitable and unlikely to support life.
Planet HD 189733b lies some 63 light years beyond our Solar System in the constellation Vulpecula is a deep cobalt blue according to data gathered by the Hubble space telescope, but its azure hue is not due to water but drops of liquid glass raining down horizontally in 7,000 kilometre-per-hour winds.
By measuring the wavelengths of light that are lost when the orbiting planet slips behind its star, scientists have been able to calculate the colour that the planet as it would appear if seen by the naked eye.
It is the first time that scientists have been able to calculate the visible colour of an “exoplanet” beyond our own Solar System, said Frederic Pont of the University of Exeter, one of the authors of the study.
“This planet has been studied well in the past, both by ourselves and other teams. But measuring its colour is a real first. We can actually imagine what this planet would look like if we were able to look at it directly,” Dr Pont said.
The planet is a gas giant, similar to Jupiter, and orbits very close to its sun, meaning that its temperatures are a scorching 1,000C or higher. Extreme winds pelt silicate particles sideways, which scatter blue light.
It was technically challenging to work out the colour of the planet because the light from its nearby star swamped any reflected light from the planet. However, by measuring the loss of light as the planet disappeared by its sun, the scientists were able to assess the wavelengths that are reflected by HD 189733b.
“We saw the brightness of the whole system drop in the blue part of the spectrum when the planet passed behind its star. From this, we can gather that the planet is blue, because the signal remained constant at the other colours we measured,” said Tom Evans of Oxford University, the lead author of the study.
- 1 Autistic teenager beaten up by bullies makes them watch 20-minute video about autism
- 2 Saudi preacher who 'raped and tortured' his five -year-old daughter to death is released after paying 'blood money'
- 3 Chris Moyles reportedly set to make radio comeback with new breakfast show on XFM
- 4 The Greece debt crisis explained in less than 100 words
- 5 Cristiano Ronaldo storms out of interview after being asked about possible sale of Manchester United target Sergio Ramos
Hilary Swank: Million Dollar Baby star says she turns down roles to care for elderly father
Autistic teenager beaten up by bullies makes them watch 20-minute video about autism
The Greece debt crisis explained in less than 100 words
Bastrop: The Texas town where many fear a large military training exercise will be used by President Obama to take their guns and impose martial law
Bakery sends 'horrific' version of Frozen-themed birthday cake to unsuspecting customer
More Britons believe that multiculturalism makes the country worse - not better, says poll
Osborne to cap family benefits at £23,000 – announced ahead of his post-election Budget
Nathan Collier: Montana man inspired by same-sex marriage ruling requests right to wed two wives
Forget little green men – aliens will look like humans, says Cambridge University evolution expert
Girl, 7, stares down hate preacher at Ohio festival with pro-LGBT rainbow flag gesture
Sickness and disability benefits could be reduced by £30 a week as part of £12bn welfare cuts
£12500 per annum: Recruitment Genius: This accounting practice is looking for ...
£7 per hour: Recruitment Genius: To work within the Visitor Experience Departm...
£18000 - £23000 per annum + Uncapped Commission: SThree: As a Trainee Recruitm...
£16500 per annum: Recruitment Genius: This online retailer of electronic acces...