Cuando un avión se aproxima a la velocidad del sonido, las ondas sonoras, debido a que avanzan casi a la misma velocidad que el aparato, no pueden alejarse de él, con lo que forman un "muro" de aire comprimido en torno al avión. 
Si las condiciones climatológicas lo permiten, ese muro puede observarse a simple vista.
En el vídeo inferior, podemos ver un F-18 rompiendo la barrera del sonido:
Your date of conception was on or about 6 January 1974 which was a Sunday.
You were born on a Sunday
under the astrological sign Libra.
Your Life path number is 5.
Life Path Compatibility:
You are most compatible with those with the Life Path numbers 1, 5 & 7.
You should get along well with those with the Life Path numbers 3 & 9.
You may or may not get along well with those with the Life Path number 8.
You are least compatible with those with the Life Path numbers 2, 4, 6, 11 & 22.
The Julian calendar date of your birth is 2442319.5.
The golden number for 1974 is 18.
The epact number for 1974 is 6.
The year 1974 was not a leap year.
Your birthday falls into the Chinese year beginning 1/23/1974 and ending 2/10/1975.
You were born in the Chinese year of the Tiger.
Your Native American Zodiac sign is Raven; your plant is Ivy.
You were born in the Egyptian month of Choiach, the fourth month of the season of Poret (Emergence - Fertile soil).
Your date of birth on the Hebrew calendar is 13 Tishri 5735.
Or if you were born after sundown then the date is 14 Tishri 5735.
The Mayan Calendar long count date of your birthday is 12.18.1.3.15 which is
12 baktun 18 katun 1 tun 3 uinal 15 kin
The Hijra (Islamic Calendar) date of your birth is Sunday, 12 Ramadan 1394 (1394-9-12).
The date of Easter on your birth year was Sunday, 14 April 1974.
The date of Orthodox Easter on your birth year was Sunday, 14 April 1974.
The date of Ash Wednesday (the first day of Lent) on your birth year was Wednesday 27 February 1974.
The date of Whitsun (Pentecost Sunday) in the year of your birth was Sunday 2 June 1974.
The date of Whisuntide in the year of your birth was Sunday 9 June 1974.
The date of Rosh Hashanah in the year of your birth was Tuesday, 17 September 1974.
The date of Passover in the year of your birth was Sunday, 7 April 1974.
The date of Mardi Gras on your birth year was Tuesday 26 February 1974.
As of 12/27/2006 8:32:12 AM EST
You are 32 years old.
You are 387 months old.
You are 1,682 weeks old.
You are 11,777 days old.
You are 282,656 hours old.
You are 16,959,392 minutes old.
You are 1,017,563,532 seconds old.
Celebrities who share your birthday:Mackenzie Crook (1971) Bryant Gumbel (1948) Lech Walesa (1943) Madeline Kahn (1942) Jerry Lee Lewis (1935) Anita Ekberg (1931) Stanley Kramer (1913) Greer Garson (1908) Gene Autry (1907) Miguel de Cervantes (1547)
Top songs of 1974
Your age is the equivalent of a dog that is 4.60939334637965 years old. (You're still chasing cats!)
There are 276 days till your next birthday
on which your cake will have 33 candles.
Those 33 candles produce 33 BTUs,
or 8,316 calories of heat (that's only 8.3160 food Calories!) .
You can boil 3.77 US ounces of water with that many candles. 
In 1974 there were approximately 3.7 million births in the US.
In 1974 the US population was approximately 203,302,031 people, 57.4 persons per square mile.
In 1974 in the US there were approximately 2,158,802 marriages (10.6%) and 708,000 divorces (3.5%)
In 1974 in the US there were approximately 1,921,000 deaths (9.5 per 1000)
In the US a new person is born approximately every 8 seconds.
In the US one person dies approximately every 12 seconds.
In 1974 the population of Australia was approximately 13,831,978.
In 1974 there were approximately 245,177 births in Australia.
In 1974 in Australia there were approximately 110,673 marriages and 17,688 divorces.
In 1974 in Australia there were approximately 115,833 deaths.
Your birthstone is Sapphire
The Mystical properties of Sapphire
Though not meant to replace traditional medical treatment, Sapphire is used for clear thinking.Some lists consider these stones to be your birthstone. (Birthstone lists come from Jewelers, Tibet, Ayurvedic Indian medicine, and other sources)
Agate, Moonstone, Lapis Lazuli
Hazelnut Tree, the Extraordinaryand 2 days have passed since Christmas 2006!Charming, undemanding, very understanding, knows how to make an impression, active fighter for social cause, popular, moody and capricious lover, honest and tolerant partner, precise sense of judgement.
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