Look at the Image you will find it..!!
Friday, September 18, 2015
Tuesday, September 15, 2015
New Horizons: New 'treasure trove' of high resolution images show Pluto's surface in greater detail
New Horizons: New 'treasure trove' of high resolution images show Pluto's surface in greater detail
New high-resolution images downloaded from NASA's New
Horizons probe over 5 billion kilometres away have stunned scientists,
revealing Pluto's pitted and cratered surface in even more detail than
before.
The New Horizons probe passed Pluto in July,
sending back the first close-up images ever seen of the dwarf planet
and taking tens of gigabits of data that will take an entire year to
send back to Earth.
The latest images now show a range of highly
complex surface features, including mountains, deep networks of valleys,
nitrogen ice flows and possible wind-blown dunes.
"This is what we came for — these images, spectra and
other data types that are going to help us understand the origin and
the evolution of the Pluto system for the first time," said New Horizons
principal investigator Alan Stern, of the Southwest Research Institute
(SwRI) in Colorado.
"And what's coming is not just the remaining
95 per cent of the data that's still aboard the spacecraft — it's the
best datasets, the highest-resolution images and spectra, the most
important atmospheric datasets, and more. It's a treasure trove.
"Pluto is showing us a diversity of landforms and complexity of processes that rival anything we've seen in the solar system.
"If
an artist had painted this Pluto before our flyby, I probably would
have called it over the top — but that's what is actually there."
The
revelation of possible dunes on the dwarf planet's surface has also
piqued scientists' interest, as they indicate the atmosphere would have
had to be thicker for wind to create the formations.
Timelapse: Pluto comes into focus
View an interactive timelapse of Pluto images captured by New Horizons, and find out what they tell us about this icy dwarf planet.
"Seeing dunes on Pluto — if that is what they are — would be
completely wild, because Pluto's atmosphere today is so thin," said
William B McKinnon, a GGI deputy lead from Washington University.
"Either Pluto had a thicker atmosphere in the past, or some process we haven't figured out is at work. It's a head-scratcher."
The images have more than doubled the amount of Pluto's surface, seen at resolutions as good as 400 metres per pixel.
They
have also revealed Pluto's global atmospheric haze has more layers than
scientists realized, creating a twilight effect that softly illuminates
nightside terrain near sunset, making it visible to the cameras aboard
New Horizons.
"This bonus twilight view is a wonderful gift that Pluto has handed to us," said John Spencer, a GGI deputy lead from SwRI.
"Now we can study geology in terrain that we never expected to see."
The
discoveries made from the new imagery will not be limited to the dwarf
planet itself — better images of Pluto's moons Charon, Nix and Hydra are
also set to be released.
Earth just had its first storm-free hurricane peak in 38 years
Earth just had its first storm-free hurricane peak in 38 years
September 12 marks the peak of the Atlantic Ocean hurricane season,
but this year the day passed without any named storms. Odder still, the
recently restless Pacific Ocean had a quiet day, too. In fact, across
the entire Northern Hemisphere, not a single tropical storm swirled.
This is the first September 12 without a major cyclone since 1977, says Philip Klotzbach,
a meteorologist at Colorado State University in Fort Collins. Tropical
Storm Vamco’s formation on Sunday ended the 54-hour serenity, the
longest September dearth of tropical cyclones since 2009, Klotzbach adds.
While the ongoing El Niño will help calm the Atlantic (SN Online: 7/12/15), those same conditions will probably keep the Pacific churning out titanic typhoons for the next few months
Satellite captures double solar eclipse in action
Satellite captures double solar eclipse in action
Launched in 2010, SDO studies the sun’s churning atmosphere. Its tilted geosynchronous orbit gives the spacecraft a nearly uninterrupted view, but on rare occasions like this, the Earth or moon can get in the way.
how many calories in a banana ..?
The banana is an edible fruit, botanically a berry, produced by several kinds of large herbaceous flowering plants in the genus Musa.
Nutrition Facts
Bananas
Amount Per 100 grams
|
| Calories 89 |
| % Daily Value* | |
| Total Fat 0.3 g | 0% |
| Saturated fat 0.1 g | 0% |
| Polyunsaturated fat 0.1 g | |
| Monounsaturated fat 0 g | |
| Cholesterol 0 mg | 0% |
| Sodium 1 mg | 0% |
| Potassium 358 mg | 10% |
| Total Carbohydrate 23 g | 7% |
| Dietary fiber 2.6 g | 10% |
| Sugar 12 g | |
| Protein 1.1 g | 2% |
| Vitamin A | 1% | Vitamin C | 14% |
| Calcium | 0% | Iron | 1% |
| Vitamin D | 0% | Vitamin B-6 | 20% |
| Vitamin B-12 | 0% | Magnesium | 6% |
Monday, September 7, 2015
We know the Earth is rotating, but why?
Why is everything in the Solar System spinning? And why is it mostly all spinning in the same direction?
Why is everything in the Solar System spinning? And why is it mostly all spinning in the same direction?
It can’t be a coincidence. Look down on the Earth from above, and you’d see that it’s turning in a counter-clockwise direction. Same with the Sun, Mars and most of the planets.
4.54 billion years ago, our Solar System formed within a cloud of hydrogen not unlike the Orion Nebula, or the Eagle Nebula, with its awesome pillars of creation. Then, it took some kick, like from the shock wave from a nearby supernova, and this set a region of the cold gas falling inward through its mutual gravity. As it collapsed, the cloud began to spin.
But why?
It’s the conservation of angular momentum.
Think about the individual atoms in the cloud of hydrogen. Each
particle has its own momentum as it drifts through the void. As these
atoms glom onto one another with gravity, they need to average out their
momentum. It might be possible to average out perfectly to zero, but
it’s really really unlikely.
Which means, there will be some left over. Like a figure skater
pulling in her arms to spin more rapidly, the collapsing proto-Solar
System with its averaged out particle momentum began to spin faster and
faster.
This is the conservation of angular momentum at work.
As the Solar System spun more rapidly, it flattened out into a disk
with a bulge in the middle. We see this same structure throughout the
Universe: the shape of galaxies, around rapidly spinning black holes,
and we even see it in pizza restaurants.
The Sun formed from the bulge at the center of this disk, and the
planets formed further out. They inherited their rotation from the
overall movement of the Solar System itself.
Over the course of a few hundred million years, all of the material
in the Solar System gathered together into planets, asteroids, moons and
comets. Then the powerful radiation and solar winds from the young Sun
cleared out everything that was left over.
Without any unbalanced forces acting on them, the inertia of the Sun
and the planets have kept them spinning for billions of years.
And they’ll continue to do so until they collide with some object, billions or even trillions of years in the future.
So are you still wondering, why does the Earth spin?
The Earth spins because it formed in the accretion disk of a cloud of
hydrogen that collapsed down from mutual gravity and needed to conserve
its angular momentum. It continues to spin because of inertia.
The reason it’s all the same direction is because they all formed together in the same Solar Nebula, billions of years ago.
Sunday, September 6, 2015
What's the difference between fission & fusion ?
What's the difference between fission & fusion ?
A nuclear reaction is a process in which atoms collide with other atoms
and lose some of their original mass. Because of the principle of
energy conservation the lost mass must reappear as generated energy,
according to Einstein's equation E = mc². The two types of nuclear
reactions used to produce energy are fission and fusion.
In a fission reaction, a heavy atomic nucleus is split into
smaller nuclei, other particles and radiation. In a typical reaction, an
atom of uranium 235 absorbs a neutron and splits into two lighter
atoms, barium and krypton, emitting radiation and neutrons. Under
special circumstances (the attainment of a "critical mass") the emitted
neutrons can split further atoms, which in turn bring about more
splitting, producing a very fast chain reaction. Nuclear power plants
exploit the process of fission to create energy.
In a fusion reaction, two or more light atomic nuclei fuse to form a single heavier nucleus. The mass change in the process is the source of nuclear energy. Fusion within the cores of the sun and other stars generates their radiating energy by fusing two hydrogen atoms to produce a helium atom. Current researchers are using magnetic vacuum chambers and laser beams in an attempt to generate the extreme high-temperatures necessary for the fusion process. If successful, the net energy gain would create a viable alternative energy option.
Friday, September 4, 2015
Thursday, September 3, 2015
Wednesday, September 2, 2015
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