Over 60 billion habitable planets probably present in our Milky Way

(This article has been cross-posted from SayPeople.com)

Over 60 billion habitable planets probably present in our Milky Way (Credit: mickare/deviantart)

Main Points:

Scientists have estimated that there could be over 60 billion habitable planets in our Milky Way alone. This estimate is about twice the previous estimates of at least one Earth-sized planet in the habitable zone of each red dwarf star.

Publishing in:

Astrophysical Journal Letters

Study Further:

Previous estimate was made by the researchers from Harvard University and this new thinking has been reported by the researchers from the University of Chicago and Northwestern University.

This new estimate has been made by considering “cloud cover”. Cloud cover is the concept given to the dayside of the exoplanets that are tidally locked i.e. one hemisphere of the planet continually faces the star (dayside), while the other faces away (darkside). It was thought that dayside would have high level of stellar flux but recent computer simulations showed otherwise due to the presence of clouds.

Cloud cover could be the reason that “tidally locked planets have low enough surface temperatures to be habitable,” explained Jang in his recently published paper.

Red dwarfs “represent about ¾ of the stars in the galaxy, so it applies to a huge number of planets,” Dr. Abbot, co-author on the paper, told Universe Today.

Future observations will approve or disprove this finding by measuring the cloud temperatures and James Webb Space Telescope would be one of the better options to study.

Source:

Universe Today

Reference:

Jun Yang, Nicolas B. Cowan, & Dorian S. Abbot (2013). Stabilizing Cloud Feedback Dramatically Expands the Habitable Zone of Tidally Locked Planets ApJ Letters, 771, L 45, 2013 arXiv: 1307.0515v

Headphone utilizing solar power to charge mobile devices

(This article first published on jeeget.blogspot.com)

You would soon get, probably by the start of next year, solar headphones that will come with the power of charging your mobile devices through solar power.

This OnBeat headphone has been launched by Andrew Anderson on the crowdfunding website Kickstarter. Anderson is expecting to raise £200,000 to start the mass production of headphones.

This headphone is fitted with a flexible solar cell with a charge capacity of 0.55 watts and the generated energy will be stored in two small lithium batteries.

"We are still working on the design and prototype," he told the BBC.

"We need to improve the headphones - people want to know about noise cancellation."

Green energy is gaining huge popularity among the users and this headphone would be a good thing.

Source:

BBC

Huge amount of cold molecules and dust in the remnant of Supernova 1987A

(This article has been cross-posted from SayPeople.com)

Hubble Space Telescope image of supernova 1987A. The keyhole-like shape at the center is the remnant of supernova explosion 1987A. This remnant is still expanding. It is believed that the surrounding ring was formed before the explosion. // ESA/NASA/P. Challis and R. Kirshner

Main Point:

Astronomers have found a huge amount of cold molecules and dust grains in the supernova remnant - Supernova 1987A that surprised them.

Study Further:

Supernova 1987A was reported after an explosion of a massive star in the year 1987. That star was found in the nearby galaxy, the Large Magellanic Cloud located about 170,000 light-years away. According to astronomers, the supernova released about thousand million times more energy than the energy emitted by the Sun in one year.

Recently, astronomers used the Herschel Space Observatory and Atacama Large Millimeter/Submillimeter Array (ALMA) to study the supernova remnant and found huge amount of cold molecules and dust.

"The powerful explosion we saw in 1987 scattered elements made by the star into space in the form of a very hot plasma,” Mikako Matsuura from University College London, said in a statement. “The gas has now cooled down to temperatures between –250° to –170° Celsius [–420° to –275° Fahrenheit]. That's surprisingly cold, comparable to the icy surface of Pluto at the edge of our solar system. The gas has formed molecules and some have even condensed into solid grains of dust. The supernova has now become a super freezer!"

According to the observations, dust and solid material produced by the supernova was about 250,000 times the mass of Earth, or three-quarters of the mass of the Sun.

"We were surprised by the amount of dust and molecular gas in the reservoir created by the Supernova 1987A,” said Matsuura. “The ALMA and Herschel observations show that the reservoir contains carbon monoxide molecules equaling one-tenth the mass of the Sun. Herschel shows that the dust mass was even larger — about half the solar mass!"

"We don't get many opportunities to study supernovae. These events are very rare and the majority was found in very distant galaxies,” said Matsuura. “Even with relatively close ones, like 1987A, it's difficult. Although they are very bright at the time of the explosion, the light from the supernovae fades very quickly making it very difficult to observe them a few years after the explosion. Carl Sagan once said that: 'We are all made of star-stuff.' These results will help us understand how that material reached us!"  

Source:

Astronomy

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