why is the sky blue? 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 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 WAVES 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. 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. COLORS OF LIGHT 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. 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 IN THE AIR 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.) WHY IS THE SKY BLUE? 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. 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. THE BLACK SKY AND WHITE SUN 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. WHY IS THE SUNSET RED? 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. 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.

whats white and black, and red all over, kiren poping jacob cherry

Have you seen Stevie Wonders new house? No neither has he.

What do you call a dog with no legs? It doesn't matter because he's not gonna come

Q: What's so funny about medical records? A: You're not the one dying.

eat a hot dog

Q: What do you call a guy with no arms and no legs, living in the mountains? A: Cliff Q: What do you call a girl with no arms and no legs, living on the beach? A: Sandy Q: What do you call a guy with no arms and no legs hanging on a wall? A: A victim of a serious crime, where murder was committed and the killer has a sick and twisted mind because he first cut off the man's arms and legs then nailed him to the wall with wooden pegs. Puppies.

Mack: Hello Jonathan: Hi Mack: My name is Mack, what's your name? Jonathan: My name is Billy Mack: You liar! I'm reading this post at anti-joke.com and whenever you reply, your name shows Johnathan! Johnathan: Well Mack, I guess you broke the 4th wall. By the way, this joke is over in 3, 2, 1...

What's eighteen inches long, stiff, and makes women scream at night? A twelve inch long penis that is erect, thus adding approximately one half of its flaccid size, and involved in the act of fornication with the female partner of the man whose penis I am describing. (Of course, it is ignorant and juvenile to assume that the man in question is heterosexual. He may be a homosexual, which is perfectly acceptable in these liberal times we live in, or he may in fact be single and not inclined towards a sexual preference of any kind. This is understandable due to the myriad complications of long-term relationships, a result of the infinite differences between the masculine and feminine psyches.)

why was the tricycle lonely? the mom back over the kid in the driveway.

Why was 6 afraid of 7? 7 commited statutory rape on a younger 5, gang banged 8 with 10 and 11, murdered 9, and was sentenced to jail for life.... eventually the case was dropped and 7 was let out early for community service. He told 6 he was coming for him 6 months later.... 6 was so terrified he didn't know what to do... he was living in fear... eventually he commited suicide by jumping off a cliff just off the coast of Palm Beach into the pacific ocean. His body was never found His family didnt get to say good bye... This is why 6 was afraid of 7

Knock Knock Who's there? Orange Orange who? Hello, I am Sergent Henry Orange. I'm afraid your husband was shot down by an enemy aircraft. I'm sorry, he was a brave man.

Man #1:Why did the monkey fall out of the tree? Man #2: I don't know Man #1: Because he died. Why did the second monkey fall out of the tree? Man #2: Because he died? Man #1: Yep. Why did the third monkey fall out of the tree? Man #2: Really? Come on, I've already answered your stupid question. Man #1: JUST ANSWER! Man #2: Fine, because he died. Man #1: No, peer pressure. Duh. Man #2 promplty punches Man #1 in the face and continues about his buisness.

Have you heard the one about Tony Hawk's brother Mike? Neither has he, considering Tony Hawk only has a brother named Steve.

A man walks into a bar. The bartender asks what he'd like to drink. The man pulls out his gun, shoots the surprised bartender, and proceeds to execute all the patrons of the bar and finally commit suicide. A post-mortem identification of the man identifies him as a victim of childhood sexual abuse and a diagnosed schizophrenic. There is a nice funeral for all the victims and the media respectfully minimizes exposure of the event.

A chicken walks into a bar and orders a beer. Just kidding chickens cant talk and animal control was called

Roses are Red Violets are Blue Some poems have endings

What's the difference between an Asian bookkeeper and a Jewish dog? This isn't a joke, it's an assignment for school, I need to write a 3 page paper on this. Any ideas?

Why did the chicken cross the road? Because he had very recentley made his escape from a nearby farm, of which was owned by a man close to dying of a Rhabdoid Tumor. His family was in mourn.

what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying what's repetitive and really annoying

Knock Knock Who's there? Ben, you just called me. Aren't we supposed to go jogging. Oh yea, I lost track of time. Is it cold out? Yea it is. You should bring a jacket. Alright, can you get me a water? Yea, no problem. Thankyou.

Before Marriage: Boy: Ah at last. I can hardly wait. Girl: Do you want me to leave? Boy: No don't even think about it. Girl: Do you love me? Boy: Of Course. Always have and always will. Girl: Have you ever cheated on me? Boy: Never. Why are you even asking? Girl: Will you kiss me? Boy: Every chance I get. Girl: Will you hit me? Boy: Hell no. Are you crazy? Girl: Can I trust you? Boy: Yes. Girl: Darling! After Marriage: (Read from bottom to top)

Who cured cancer? Not God. What do you think of the almighty now?

Q: What is black and white, black and white, black and white? A: A Nun falling down the stairs.

Anti Joke

What are Antijokes? Anti Jokes (or Anti Humor) is a type of comedy in which the uses is set up to expect a typical joke setup however the joke ends with such anticlimax that it becomes funny in its own right. The lack of punchline is the punchline.

Our Updated iOS App!

We've just released huge update to the iOS app! Now, access all your favorite text and photo sites like Anti-Joke, DIYLOL! A few things didn't make the original cut (like comments) but they'll be back soon. Best of all, the app is now FREE! Get it here.

The Anti Joke Book


NEW ANTI-JOKE BOOK!  Now that we've resolved the printing issues with our publisher, check out the BRAND SPANKING NEW Anti-Joke Book!

MOAR??

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