Image of the Day…. Space Station Flies over Super Typhoon Maysak !!!

Typhoon Maysak strengthened into a super typhoon on March 31, reaching Category 5 hurricane status on the Saffir-Simpson Wind Scale. ESA Astronaut Samantha Cristoforetti captured this image while flying over the weather system on board the International Space Station.

The Tropical Rainfall Measuring Mission (TRMM) and Global Precipitation Measurement (GPM) satellites, both co-managed by NASA and the Japan Aerospace Exploration Agency, captured rainfall and cloud data that revealed heavy rainfall and high thunderstorms in the strengthening storm.

The TRMM satellite has been collecting valuable scientific data since November 1997. Early on March 30, the satellite collected rainfall data as it flew directly above Maysak at 04:14 UTC (12:14 a.m. EDT) when maximum sustained winds were near 85 knots (98 mph). Rainfall data was collected by TRMM’s Microwave Imager (TMI) and Precipitation Radar (PR) instruments and showed heaviest rainfall southwest of the center, and in fragmented bands of thunderstorms northeast of the center. In both of those places rainfall was in excess of 50 mm/2 inches per hour.

More information.

Image Credit: ESA/NASA/Samantha Cristoforetti 

Source:::::: http://www.nasa.gov

Natarajan

” The Best Management Lesson I Have Learned….” See What Dr. Kalam Says …

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IndiaKnowledge@ Wharton : Could you give an example, from your own experience, of how leaders should manage failure?

Kalam: Let me tell you about my experience. In 1973 I became the project director of India’s satellite launch vehicle program, commonly called the SLV-3. Our goal was to put India’s “Rohini” satellite into orbit by 1980. I was given funds and human resources — but was told clearly that by 1980 we had to launch the satellite into space. Thousands of people worked together in scientific and technical teams towards that goal.

By 1979 — I think the month was August — we thought we were ready. As the project director, I went to the control center for the launch. At four minutes before the satellite launch, the computer began to go through the checklist of items that needed to be checked. One minute later, the computer program put the launch on hold; the display showed that some control components were not in order. My experts — I had four or five of them with me — told me not to worry; they had done their calculations and there was enough reserve fuel. So I bypassed the computer, switched to manual mode, and launched the rocket. In the first stage, everything worked fine. In the second stage, a problem developed. Instead of the satellite going into orbit, the whole rocket system plunged into the Bay of Bengal. It was a big failure.

That day, the chairman of the Indian Space Research Organization, Prof. Satish Dhawan, had called a press conference. The launch was at 7:00 am, and the press conference — where journalists from around the world were present — was at 7:45 am at ISRO’s satellite launch range in Sriharikota [in Andhra Pradesh in southern India]. Prof. Dhawan, the leader of the organization, conducted the press conference himself. He took responsibility for the failure — he said that the team had worked very hard, but that it needed more technological support. He assured the media that in another year, the team would definitely succeed. Now, I was the project director, and it was my failure, but instead, he took responsibility for the failure as chairman of the organization.

The next year, in July 1980, we tried again to launch the satellite — and this time we succeeded. The whole nation was jubilant. Again, there was a press conference. Prof. Dhawan called me aside and told me, “You conduct the press conference today.”

I learned a very important lesson that day. When failure occurred, the leader of the organization owned that failure. When success came, he gave it to his team. The best management lesson I have learned did not come to me from reading a book; it came from that experience.

What a wonderful leader!

Source::::::: http://www.mastegg.com

Natarajan

Solar Power Station in Sky …. ?

What science fiction writer Isaac Asimov wrote in his 1941 short story “Reason” speculating space stations to transmit energy to Earth using microwave beams may become a reality soon, if Chinese scientists have their way to build ambitious solar-power generating station somewhere up in the sky.

NASA, CERN AMS Experiment aboard ISS

Wang Xiji, a scientist who had spent 50 years on the concept at the Chinese Academy of Sciences and an International Academy of Astronautics member, says Asimov’s fiction is possible and revealed that China is planning to ahead with the idea.

The huge solar power station to be built 36,000 kilometres above the ground will not only solve the energy crisis on the earth but also save the planet from the vagaries of greenhouse gases and pollution, says an upbeat Wang, whose dream concept is gaining currency of late.

The enormity of the project is, however, too huge surpassing the known mega-projects like the US Apollo project or the US-Russian joint project — the International Space Station. So huge that it may look like a super spacecraft on a geosynchronous orbit with its solar panels extending more than 6 kilometres in length each.

The solar panels will store the energy which will be converted to microwaves or lasers and transmitted to a collector on Earth, explain scientists.

Wang, 93, who is a veteran in the concept told Xinhua: “An economically viable space power station would be really huge, with the total area of the solar panels reaching 5 to 6 sq km. Maybe people on Earth could see it in the sky at night, like a star.”

Moreover, space-based solar panels produce ten times as much electricity as ground-based panels produce per unit area, says Duan Baoyan, another member of the team at the Chinese Academy. “If we have space solar power technology, hopefully we could solve the energy crisis on Earth,” Duan said.

But there is more than that. Mere solar energy and cheaper energy is not the focus but it can change the strategic power balance on Earth. Wang reiterates that the first inventor of the technology “could occupy the future energy market. So it’s of great strategic significance.”

In the past, Japan and the US did explore the possibility and dropped the idea due to enormity of the project that enhances energy production by just 10 times. Japan has already made lead in the development of wireless power transmission technology.

Secondly, the weight of such space power station would be anywhere in the range of 10,000 tons and you need not just a rocket launcher but an asteroid to carry it to space. So, the question is whether China is willing to undertake the challenge.

“We need a cheap heavy-lift launch vehicle,” says Wang. “We also need to make very thin and light solar panels. The weight of the panel must be less than 200 grams per square metre.”

On the positive note, Wang says: “When space solar energy becomes our main energy, people will no longer worry about smog or the greenhouse effect.”

Source:::: http://www.microfinancemonitor.com

Natarajan

Image of the Day…” Simutaneous view of Eclipsed Moon and Sun in the Sky…”

Who will see a selenelion – the eclipsed moon and sun in the sky simultaneously – for the April 4, 2015 total eclipse of the moon? Charts and info here.

Tonight's sunset and moonrise - September 19, 2013 - as seen by EarthSky Facebook friend Andy Somers in Noumea, New Caledonia.  One of the characteristics of the Harvest Moon is that it rises around the time of sunset for several evenings in a row.  Thank you, Andy.

This photo does not show an eclipsed moon, but it does show a simultaneous sunset and (nearly) full moonrise as captured byEarthSky Facebook friend Andy Somers in Noumea, New Caledonia in September 2013. On Saturday, April 4, 2015 – from just the right spot on Earth – you might see something like this … but the moon will be in eclipse!

In case you haven’t heard, there’s a total lunar eclipse coming up this Saturday, April 4, 2015. North Americans will see the eclipse Saturday morning. Australians and Asians will see it Saturday evening.Read more about the April 4 eclipse here.

If you’re in just the right spot on Earth, you might observe the eclipsed moon setting while the sun rises – or the eclipsed moon rising while the sun sets. This is called a selenelion. Celestial geometry says this should not happen. After all, in order for an eclipse to take place, the sun and moon must be exactly 180 degrees apart in the sky, in a perfect alignment known as a syzygy. Such perfection – needed for an eclipse to take place – would seem to make it impossible to view the sun and eclipsed moon above your horizon simultaneously.

But – thanks to atmospheric refraction, the same effect that causes a spoon in a glass of water to appear broken in two – you might actually see images of the sun and totally eclipsed moon, both above your horizon at once, lifted up by the effect of refraction.

You need to be positioned in just the right spot on Earth’s surface to see a selenelion.

Source::::: http://www.earthskynews.org

Natarajan

Shortest Lunar Eclipse of the Century…. on 4 April 2015….

Total lunar eclipse in 2004 by Fred Espenak

The total eclipse of the full moon on April 4, 2015 will last less than five minutes, making it the shortest total lunar eclipse of the 21st century. It’s perfect for short attention spans! The total lunar eclipse will be visible from western North America, eastern Asia, the Pacific, Australia and New Zealand. At North American time zones, that means the greatest eclipse happens before sunrise on April 4 – the morning of April 4, not the evening. From the world’s Eastern Hemisphere – eastern Asia, Indonesia, New Zealand and Australia – the greatest eclipse takes place after sunset April 4. Follow the links below to learn eclipse times and more:

Eclipse times in Universal Time

Eclipse times for for North American time zones

Is this the third of four Blood Moon eclipses?

Who will see a partial lunar eclipse?

What causes a lunar eclipse?

Time lapse of October 8, 2014 lunar eclipse as reflected in a pond in central Illinois, by Greg Lepper.

Time lapse of October 8, 2014 lunar eclipse as reflected in a pond in central Illinois, by Greg Lepper 

source:::::www.earthskynews.org

Natarajan

Image of the Day…Sunrise !!!

Striped sunrises and the shadows they cast

Two photos by Peter Lowenstein. One shows a sunrise striped with cloud, and the other shows the shadow from a cloud-striped sunrise on a nearby mountain slope.

View larger. | Photo by Peter Lowenstein.

Peter Lowenstein of Mutare, Zimbabwe – who recently contributed an interesting photo of straight lightning to these pages – has submitted another set of unusual photos for us. One is above, and the other is at the bottom of this post. The photos were taken a year apart, but might have been taken on the same day if two photographers had been standing back to back, one shooting a cloud-striped sunrise and the other shooting the sun’s first light – showing banded cloud shadow – shining on a nearby mountain slope. Peter wrote:

The first picture was taken almost a year ago from a high vantage point in the Bvumba Mountains looking east over Chikamba in Mozambique and shows a glorious sun striped by rising through thin layers of early morning cloud and mist on the horizon. I captured it at 5:57 a.m. using a Panasonic Lumix DMC-TZ10 compact camera in sunset mode and x16 zoom setting.

The second picture was taken at sunrise yesterday morning (March 29, 2015) from the verandah of my house and shows alternate stripes of bright orange sunlight and the dark shadows of a thin strip of cloud and the eastern horizon being projected by the sun onto Murawa Mountain a few kilometers to the west. This spectacle lasted less than a minute before being faded by larger clouds passing in front of the sun. It was captured at 6:10 a.m. using a Panasonic Lumix DMC-TZ60 compact camera in sunset mode and x2 zoom setting.

View larger. | Photo by Peter Lowenstein.

Bottom line: Peter Lowenstein in Zimbabwe took these photos a year apart. One shows a sunrise striped with cloud, and the other shows cloud-striped sunrise’s cloud shadow.

Source:::::::: http://www.earthskynews.org

Natarajan

 

Amazing Street Art ….Classic Chalk Drawings !!!

A gaping volcano, a sheer cliff, dragons and goblins and gates to heavenly kingdoms – all opening before you as you walk down these sidewalks, those lucky sidewalks that got to bear these wonderful chalk drawings that come to life before you eyes!

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

chalk drawings

Source:::: ba-bamail.com

Natarajan

Speed of Electricity… Slower than a Turtle !!!

Slower Than a Turtle

You may be surprised to learn that electrons flow through a typical copper wire much slowerthan a turtle walks.

Each wire that conducts a flow of electrons, producing usable electric current, is composed of billions of atoms. To move along it, the electrons have to traverse these atoms, randomly zig-zagging their way as they do, resulting in the net flow rate, called “drift velocity,” in a given direction being quite slow.

How slow exactly? To calculate it, we use this formula: I = n*A*v*Q or v = I/(n*A*Q)

I is the current, n is the number of electrons per cubic meter, A is the cross-section of the wire, Q is the charge of an electron and v is the drift velocity of the electrons.

Since the number of electrons in a copper wire (n) is 8.5 * 1028 per m3, and the charge of an electron (Q) is 1.6 * 10-19C, if we also know the cross sectional area and the current, we can calculate the electrons’ drift velocity.

For example, suppose you have a current of 14 amps and a copper wire with a cross section of 3 * 10-6 m2. Plug in all the numbers and you get that the electrons are moving at a speed of 3.4 * 10-4 m/s – or about one-third of a millimeter per second.

To put it in values that are easier to conceptualize, this works out to about 1.2 meters (4.1 feet) per hour- a rate far slower than the average box turtle, which can cover about 800 feet in that same amount of time.

So how is it that something that is essentially slower than a turtle can more or less instantaneously turn on a light across a room?

Chain reaction.
The atoms in the wire are crammed together cheek to jowl, which, while it makes the going slow, also has the electrons more or less abutting one another. When the switch is turned on, thanks to the electrical potential difference created by the generator, a force is created to move the electrons, with each pushing its neighbor, which in turn pushes its neighbor and so on all the way through the wire.

So, while no electrons zoom through the wire to turn on the light as you might have previously thought, it ends up seeming like that is what’s happening. This is not unlike how when you turn on your faucet, water instantly comes out despite the fact that your water source might be many miles away.

Bonus Fact:

  • The land speed record for a tortoise in competition was set by a leopard tortoise named Bertie who flew up an 18-foot uphill track in just under 20 seconds (about 0.61 mph) in 2014.

Source:::::www.today i foundout.com

Natarajan

Image of the Day…Spacecraft Launch on March 27 2015…

One-year crew lift-off success

NASA astronaut Scott Kelly and Russian Federal Space Agency (Roscosmos) cosmonaut Mikhail Kornienko will spend a year aboard the International Space Station.

Soyuz TMA-16M spacecraft launch on March 27, 2015

Media photograph the Soyuz TMA-16M spacecraft as it launches to the International Space Station with Expedition 43 NASA astronaut Scott Kelly, Russian cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency (Roscosmos) onboard.

Liftoff was at 3:42 p.m. EDT Friday, March 27, 2015 (March 28 Kazakh time) from the Baikonur Cosmodrome in Kazakhstan.

As the one-year crew, Kelly and Kornienko will return to Earth on Soyuz TMA-18M in March 2016.

The goal of the mission is to help scientists better understand how the human body reacts and adapts to the harsh environment of space.

Source:::: http://www.earthskynews.org

Natarajan

 

Image of the Day….Milky Way !!!

Malibu stargazer

We’re getting many comments this month about the return of the Milky Way for late night and early morning stargazers.

View larger. | Shreenivasan Manievannan calls this photo Malibu Stargazer.

View larger. | Shreenivasan Manievannan calls this photo Malibu Stargazer.

Our friend Shreenivasan Manievannan posted this photo to EarthSky Facebook. He wrote that, from this beach in southern California, even with all the light pollution from nearby Los Angeles, the Milky Way rose and was visible to the unaided eye. Thank you, Shreenivasan! Beautiful photo.

We’re getting many comments this month about the return of the Milky Way for late night and early morning stargazers. The best time to see it in the evening is around August, but you can also glimpse it now – stretching across a dark country sky – if you stay up late, or get up early.

Help EarthSky build a new community website in 2016! Click here to learn EarthSky’s history and goals, and donate today.

Bottom line: Malibu stargazer, a photo by Shreenivasan Manievannan. Visit his page on 500px.com.

source:::: http://www.eartskynews.org

Natarajan