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Fri, 29 Jul 2016
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Science & Technology


Solar Impulse 2 begins last leg of round-the-world trek

© Jean Revillard / Reuters
Solar Impulse 2 over the pyramids of Giza.
An airplane which solely relies on solar energy has taken off on the last leg of its round-the-world-trip. It is expected to reach its final destination in some 48 hours, which would make it the first solar-powered aircraft to circle the globe. On Sunday at 1:30am local time, the one-of-a-kind plane took off from Cairo and is now heading towards Abu Dhabi - the city from which it started its long journey last year. It is expected to reach the city within the next 48 hours.

Last week, the aircraft made a landing in Egypt after a flight from Seville, Spain. The pilots were forced to postpone the following takeoff from Cairo to the UAE due to extreme heat in Saudi Arabia. On the Solar Impulse blog, the Mission Control Center team said they "identified a weather window that could allow us to overcome the challenging high temperatures across Saudi Arabia and hopefully land in Abu Dhabi after 48 hours."

"We want to share with you the suspense of an attempted takeoff for this last leg of the round-the-world adventure. If we manage to get Si2 airborne, this will be Solar Impulse's last flight, so come with us!"


The Atir-Rosenzweig-Dunning Effect: How being an expert in an area can make one claim knowledge they couldn't possibly know

© Shutterstock
Remember the Dunning-Kruger Effect? The finding by David Dunning and Justin Kruger that incompetence leads to inflated beliefs of competence. If you need a refresher, the concept is succinctly explained below by John Cleese:

Dunning has now conducted a new study with colleagues Stav Atir and Emily Rosenzweig, finding that expertise has its own pitfalls. In a series of experiments conducted at Cornell University, the researchers found that people with greater knowledge in a particular domain were more likely to claim knowledge that they could not possibly know.

Comment: See also:


Self-driving shuttle to start operations in Lyon, France in September

Just this week a truck driver informed me that autonomous trucks are at least "decades away".

It's 2016, six to eight years away from my target date, and self-driving shuttles will hit Lyon, France this September.

Via translation from LyonMag.Com, please consider Free Autonomous Shuttle Starts September.
It was only a matter of time. And it is now official. Two Navya Arma shuttles arrive in the Confluence district in September.

These shuttles driverless, 100% autonomous and fully electric task will be to carry passengers between the leisure division and Confluence shopping and the tip of the peninsula, up to the GL Events seat.

Navya Arma has "lasers that sweep space, cameras and precise GPS". The Navya should be able to circulate in the Lyon area starting early September, from 7:30 to 18:30. Despite the absence of a driver, the shuttle can reach 25km/hour, safe for passengers or pedestrians.

Cloud Grey

What causes iridescent clouds?

Laura Berry caught these iridescent clouds on May 31, 2016. Thanks, Laura!
Sky watchers sometimes report seeing rainbow colors within clouds. These colorful clouds are called iridescent clouds. When you see a cloud like this, you know there are especially tiny ice crystals or water droplets in the air. Larger ice crystals produce solar or lunar halos, but tiny ice crystals or water droplets cause light to be diffracted - spread out - creating this rainbow-like effect in the clouds.

The phenomenon is called cloud iridescence or irisation. The term comes from Iris, the Greek personification of the rainbow.

The images on this page are mostly via EarthSky friends on Facebook and Google+. Our thanks to all who contribute!


Butterfly bacteria creates separate, female only species

© University of Exeter
Tiny microbe turns tropical butterfly into male killer.
They are so beautiful, these man-eaters.

In Nairobi, the heart of Kenya, within what scientists call a hybrid zone for butterflies, two subspecies of the African queen have no males. That's because the females are infected with a bacterium known as Spiroplasma ixodeti that kills 100 percent of their male offspring. The eggs don't hatch.

What's worse, at least for the males, is that the female eggs hatch normally, and their doomed brothers are among their first meals. The Daryl Hall and John Oates lyrics say it best: "Oh-oh here she comes. Watch out, boy, she'll chew you up. ... She's a man-eater."

Don't blame the lovely cannibal butterflies, said Richard ffrench-Constant, a professor of molecular natural history at the University of Exeter in England and the author of a study released Tuesday. Blame nature. "The sisters eating their dead brothers is just a byproduct of the males dying in their eggs," he said very matter-of-factly. "Many caterpillars eat their own eggs after hatching, so it's probably just a by-product of that."


Newly discovered giant megathrust fault has potential to kill millions

More than 140 million people live within a 60 mile area of the potential disaster zone in Bangladesh.
A giant fault in the earth's crust covers by millions of tonnes of sediment in one of the world's most densely populated areas could kill tens of millions of people, scientists have claimed.

Researchers placed hundreds of highly accurate GPS receivers in locations across India, Bangladesh and Myanmar and monitored them over a ten year period.

Now the scientists fear the location is home to a megathrust fault which could unleash a 9.0 magnitude earthquake at any minute.

The scientists, led by Dr Michael Steckler from Columbia University published their findings in the journal Nature.

The experts discovered that millions of tonnes of sediment from the Ganges and Brahmaputra rivers has been dumped into the megathrust fault, where one of the earth's plates is being pushed under another.


Natural mosquito repellent? Chickens

For the first time, scientists have shown that malaria-transmitting mosquitoes actively avoid feeding on certain animal species such as chickens, using their sense of smell. Odors emitted by species such as chickens could provide protection for humans at risk of mosquito-transmitted diseases, according to a study in the open access Malaria Journal.

Researchers at the Swedish University of Agricultural Sciences and Addis Ababa University, Ethiopia found that Anopheles arabiensis, one of the predominant species transmitting malaria in sub-Saharan Africa, avoids chickens when looking for hosts to feed on. This indicates that, unlike humans, cattle, goats and sheep, chickens are a non-host species for An. arabiensis and that the mosquitoes have developed ways of distinguishing them from host species.

Rickard Ignell, the corresponding author, said:
"We were surprised to find that malaria mosquitoes are repelled by the odors emitted by chickens. This study shows for the first time that malaria mosquitoes actively avoid feeding on certain animal species, and that this behavior is regulated through odor cues."

Comment: Read the study here [link]

Also see Why mosquitos attack some, but leave others alone

Comet 2

Halley's comet orbit being altered by Venus instead of Jupiter

Halley’s comet.
If you're waiting for Halley's comet to show up exactly 75 years after its 1986 appearance, you may be disappointed. The ball of ice has an orbit that varies by months or even years.

And new research suggests that Venus is responsible for the comet's variations today, rather than the more massive planet Jupiter.

"Comet Halley has been observed throughout history, all the way back to 240 BC by the Chinese," Tjarda Boekholt, an astrophysicist at Leiden Observatory in the Netherlands, told Discover by email.

Erratic Schedule

With many well-documented appearances, scientists quickly realized that the arrival time of the comet was constantly changing. For instance, although it passed Earth in February in 1986, it won't be back until February 2061. In 45 years, it will instead appear in July.

"It is the variation in the time of sightings that provided the first clue to comet Halley's chaotic orbit," Boekholt said. "The orbit of comet Halley is not static, but it is evolving."

Boekholt led a team that investigated the comet's changing orbit. They found that Venus played an important role in revising the comet's orbit in the past, and will probably continue to do so in the future, despite its small stature. Mighty Jupiter often dominates the influence of gravitational bodies due to its high mass, but Venus currently dominates Halley's is movements.

The research will be published in the journal The Monthly Notices of the Royal Astronomical Society. A preprint is available online.


NASA allows Mars 'Curiosity' rover to fire laser at will

When NASA launched Curiosity Rover, a 1-ton robotic beast that would basically take planetary exploration to the next level, we all knew we were in for a brilliant treat.

The car-sized Curiosity rover is the centerpiece of NASA's US$2.5 billion Mars Science Laboratory mission to Mars. Curiosity was sent to the Red Planet to assess whether it is, or ever will be, capable of supporting microbial life.

Well its official, the Curiosity Rover has just become even cooler — and here's why:


China to launch first fully-automatic driverless subway train

The first fully-automatic subway train entirely developed in China will be put into operation in Beijing in 2017, media reported Friday.

According to the China Radio International (CRI), the trial of the subway train on 35-kilometer-long (22 miles) Yanfang Line linking Hebei's Yanjiao and Fangshan district in Beijin will be launched in December 2016, while the commissioning is expected by the end of 2017.

Once integrated into an automatic metro system, the driverless trains will be able to run between the stations and make stops, open and close doors and return to the terminal station. It is expected that the automatic trains will run well on schedule without any delay.

The fully-automatic trains are designed by the Chinese CRRC Corporation Limited company, a state-owned rolling stock manufacturer.