Tag Archives: Science

Time Dilation

28 Mar

What Is A Black Hole ?

28 Mar


A black hole with gas spiraling into it

An artist’s drawing shows a large black hole pulling gas away from a nearby star. Image Credit: NASA E/PO, Sonoma State University, Aurore Simonnet

A black hole is a place in space where gravity pulls so much that even light can not get out. The gravity is so strong because matter has been squeezed into a tiny space. This can happen when a star is dying. 

Because no light can get out, people can’t see black holes. They are invisible. Space telescopes with special tools can help find black holes. The special tools can see how stars that are very close to black holes act differently than other stars. 

How Big Are Black Holes?

Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is…

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Why is the sky blue?

12 Mar

Look! I found the answer of our question… 🙂


On a clear sunny day, the sky above us looks bright blue. In the evening, the sunset puts on a brilliant show of reds, pinks and oranges. Why is the sky blue? What makes the sunset red?

To answer these questions, we must learn about light, and the Earth’s atmosphere.


The atmosphere is the mixture of gas molecules and other materials surrounding the earth. It is made mostly of the gases nitrogen (78%), and oxygen (21%). Argon gas and water (in the form of vapor, droplets and ice crystals) are the next most common things. There are also small amounts of other gases, plus many small solid particles, like dust, soot and ashes, pollen, and salt from the oceans.

The composition of the atmosphere varies, depending on your location, the weather, and many other things. There may be more water in the air after a rainstorm, or near the ocean. Volcanoes can put large amounts of dust particles high into the atmosphere. Pollution can add different gases or dust and soot.

The atmosphere is densest (thickest) at the bottom, near the Earth. It gradually thins out as you go higher and higher up. There is no sharp break between the atmosphere and space.


Light is a kind of energy that radiates, or travels, in waves. Many different kinds of energy travel in waves. For example, sound is a wave of vibrating air. Light is a wave of vibrating electric and magnetic fields. It is one small part of a larger range of vibrating electromagnetic fields. This range is called the electromagnetic spectrum.

Electromagnetic waves travel through space at 299,792 km/sec (186,282 miles/sec). This is called the speed of light.

Light waves

The energy of the radiation depends on its wavelength and frequency. Wavelength is the distance between the tops (crests) of the waves. Frequency is the number of waves that pass by each second. The longer the wavelength of the light, the lower the frequency, and the less energy it contains.


Visible light is the part of the electromagnetic spectrum that our eyes can see. Light from the sun or a light bulb may look white, but it is actually a combination of many colors. We can see the different colors of the spectrum by splitting the light with a prism. The spectrum is also visible when you see a rainbow in the sky.

Rainbow Picture

The colors blend continuously into one another. At one end of the spectrum are the reds and oranges. These gradually shade into yellow, green, blue, indigo and violet. The colors have different wavelengths, frequencies, and energies. Violet has the shortest wavelength in the visible spectrum. That means it has the highest frequency and energy. Red has the longest wavelength, and lowest frequency and energy.


Light travels through space in a straight line as long as nothing disturbs it. As light moves through the atmosphere, it continues to go straight until it bumps into a bit of dust or a gas molecule. Then what happens to the light depends on its wave length and the size of the thing it hits.

Dust particles and water droplets are much larger than the wavelength of visible light. When light hits these large particles, it gets reflected, or bounced off, in different directions. The different colors of light are all reflected by the particle in the same way. The reflected light appears white because it still contains all of the same colors.

Gas molecules are smaller than the wavelength of visible light. If light bumps into them, it acts differently. When light hits a gas molecule, some of it may get absorbed. After awhile, the molecule radiates (releases, or gives off) the light in a different direction. The color that is radiated is the same color that was absorbed. The different colors of light are affected differently. All of the colors can be absorbed. But the higher frequencies (blues) are absorbed more often than the lower frequencies (reds). This process is called Rayleigh scattering. (It is named after Lord John Rayleigh, an English physicist, who first described it in the 1870’s.)


The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.

However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.

Blue sky from scattered light

As you look closer to the horizon, the sky appears much paler in color. To reach you, the scattered blue light must pass through more air. Some of it gets scattered away again in other directions. Less blue light reaches your eyes. The color of the sky near the horizon appears paler or white.

Sky paler at horizon


On Earth, the sun appears yellow. If you were out in space, or on the moon, the sun would look white. In space, there is no atmosphere to scatter the sun’s light. On Earth, some of the shorter wavelength light (the blues and violets) are removed from the direct rays of the sun by scattering. The remaining colors together appear yellow.

Also, out in space, the sky looks dark and black, instead of blue. This is because there is no atmosphere. There is no scattered light to reach your eyes.

Black sky in space


As the sun begins to set, the light must travel farther through the atmosphere before it gets to you. More of the light is reflected and scattered. As less reaches you directly, the sun appears less bright. The color of the sun itself appears to change, first to orange and then to red. This is because even more of the short wavelength blues and greens are now scattered. Only the longer wavelengths are left in the direct beam that reaches your eyes.

Sun red at sunset

The sky around the setting sun may take on many colors. The most spectacular shows occur when the air contains many small particles of dust or water. These particles reflect light in all directions. Then, as some of the light heads towards you, different amounts of the shorter wavelength colors are scattered out. You see the longer wavelengths, and the sky appears red, pink or orange.

Source: http://www.sciencemadesimple.com/sky_blue.html

Character resemblances~

3 Mar

Mii’s back:3
Today i watch animax, specifically, last exile – ginyoku no fam.
I see Dyan and remembered Shiro from deadman wonderland right away.
So i decide to put characters from different manga or anime that are look alike!

1. Siegheart (Rave Master) and Sieglein/Jellal (Fairy Tail)

Naa, this is obvious…

2. Ultear (Fairy Tail) and Nico Robin (One Piece)

They’re alike, don’t they??

3. Dyan (Last Exile Ginyoku no Fam) and Shiro (Deadman Wonderland)

4. Yu Narukami (Persona 4 the animation) and Light Yagami (Deathnote)
Not sure bout this, though…

5. Tsugumi (Guilty Crown) and Aoi Yamada (Working!!!)

6. Nagi Sanzenin (Hayate no Gotoku) and Mina Tepes (dance in the Vampire bund)

8. Sunako Nakahara (Perfect girl evolution) dan Sawako (Kimi ni Todoke)

And the chibi version too~

Lol this is useless~~~ xD


27 Feb

Sheep i hate the most for making me freaked… :’O



Dolly (sheep)

From Wikipedia, the free encyclopedia
Dolly (sheep)

Dolly’s remains, exhibited at the National Museum of Scotland.
Species Domestic sheep
Sex Female
Born 5 July 1996
Died 14 February 2003 (aged 6)
Resting place National Museum of Scotland(remains on display)
Nation from Scotland
Years active 1997 – 2003
Notable role First cloned sheep
Known for First mammal to be cloned from an adult somatic cell
Offspring Six lambs (Bonnie, twins – Sally and Rosie, triplets – Lucy, Darcy, Cotton)
Named after Inspired by Dolly Parton’s name

Close up of Dolly’s taxidermied remains.

Dolly (5 July 1996 – 14 February 2003) was a female domestic sheep, and the first mammal to be cloned from an adult somatic cell, using the process of nuclear transfer.[1][2] She was cloned by Ian Wilmut, Keith Campbell and colleagues at the Roslin Institute and the biotechnology company PPL Therapeutics near Edinburgh in Scotland. She was born on 5 July 1996 and she lived until the age of six, at which point she died from a progressive lung disease.[3] She has been called “the world’s most famous sheep” by sources including BBC News and Scientific American.[4][5] The cell used as the donor for the cloning of Dolly was taken from a mammary gland, and the production of a healthy clone therefore proved that a cell taken from a specific part of the body could recreate a whole individual. On Dolly’s name, Wilmut stated “Dolly is derived from a mammary gland cell and we couldn’t think of a more impressive pair of glands than Dolly Parton’s”.[6][edit]Birth

The cloning process that produced Dolly

Dolly was born on 5 July 1996 to three mothers (one provided the egg, another the DNA and a third carried the cloned embryo to term).[7]She was created using the technique of somatic cell nuclear transfer, where the cell nucleus from an adult cell is transferred into an unfertilised oocyte (developing egg cell) that has had its nucleus removed. The hybrid cell is then stimulated to divide by an electric shock, and when it develops into a blastocyst it is implanted in a surrogate mother.[8] Dolly was the first clone produced from a cell taken from an adult mammal. The production of Dolly showed that genes in the nucleus of such a mature differentiated somatic cell are still capable of reverting back to an embryonic totipotent state, creating a cell that can then go on to develop into any part of an animal.[9] Dolly’s existence was announced to the public on 22 February 1997.[3]


Dolly lived for her entire life at the Roslin Institute in Edinburgh. There she was bred with a Welsh Mountain ram and produced six lambs in total. Her first lamb, named Bonnie, was born in April 1998.[3] The next year Dolly produced twin lambs Sally and Rosie, and she gave birth to triplets Lucy, Darcy and Cotton in the year after that.[10] In the autumn of 2001, at the age of four, Dolly developed arthritis and began to walk stiffly, but this was successfully treated with anti-inflammatory drugs.[11]


On 14 February 2003, Dolly was euthanised because she had a progressive lung disease and severe arthritis.[12] A Finn Dorset such as Dolly has a life expectancy of around 11 to 12 years, but Dolly lived to be only six years of age. A post-mortem examination showed she had a form of lung cancer called Jaagsiekte,[13] which is a fairly common disease of sheep and is caused by the retrovirus JSRV.[14] Roslin scientists stated that they did not think there was a connection with Dolly being a clone, and that other sheep in the same flock had died of the same disease.[12] Such lung diseases are a particular danger for sheep kept indoors, and Dolly had to sleep inside for security reasons.

Some have speculated that a contributing factor to Dolly’s death was that she could have been born with a genetic age of six years, the same age as the sheep from which she was cloned.[15] One basis for this idea was the finding that Dolly’s telomeres were short, which is typically a result of the ageing process.[16][17] The Roslin Institute have stated that intensive health screening did not reveal any abnormalities in Dolly that could have come from advanced aging.[15]


After cloning was successfully demonstrated through the production of Dolly, many other large mammals have been cloned, includinghorses and bulls.[18] The attempt to clone argali (mountain sheep) did not produce viable embryos. The attempt to clone a banteng bull was more successful, as were the attempts to clone mouflon (a form of wild sheep), both resulting in viable offspring.[19] The reprogramming process cells need to go through during cloning is not perfect and embryos produced by nuclear transfer often show abnormal development.[20][21] Making cloned mammals is highly inefficient (Dolly was the only lamb that survived to adulthood from 277 attempts). Wilmut, who led the team that created Dolly, announced in 2007 that the nuclear transfer technique may never be sufficiently efficient for use in humans.[22]

Cloning may have uses in preserving endangered species and may become a viable tool for reviving extinct species.[23] In January 2009, scientists from the Centre of Food Technology and Research of Aragon, in Zaragoza, northern Spain announced the cloning of thePyrenean ibex, a form of wild mountain goat, which was officially declared extinct in 2000. Although the newborn ibex died shortly after birth due to physical defects in its lungs it is the first time an extinct animal has been cloned, and may open doors for saving endangered and newly extinct species by resurrecting them from frozen tissue.[24] Cloning of domesticated animals could be important in the future production of transgenic livestock.[25]

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