Our solar system’s seventh planet, unlike the first six, was not known to the ancients. Uranus was discovered in 1781 by telescopic observations of the English astronomer Sir William Herschel. Indeed, it had been observed by many other astronomers as early as 1690, but because of its extremely slow motion across the sky (an 84-year orbit period), it was mistaken for a star.

Because Uranus has an average orbital distance of about 19 astronomical units (Saturn, the next closest planet to the Sun, has an average orbital distance of about 9.5 astronomical units), its discovery instantly doubled the size of the solar system.

At 4 times the diameter and 15 times the mass of Earth, Uranus is classified as a giant planet, but it is much smaller than planetary cousins Jupiter and Saturn. Still, the atmosphere of Uranus contains mostly hydrogen and helium, and the planet’s distinctive blue-green color is caused by methane clouds and hazes in the upper atmosphere. Storms on Uranus are rare, and the cloud and haze bands are usually quite faint.

Uranus has a different overall planetary composition from Jupiter and Saturn, however, with significant amounts of ice and rock in the deep interior. In fact, the ratio of ice and rock to gas is so much higher in Uranus (and Neptune), as compared to Jupiter and Saturn, that the planet is more appropriately called an ice giant instead of a gas giant.

As discovered by telescopic observations and the Voyager 2 flyby in 1986, Uranus has 5 large moons and 22 smaller moons, all of them dark and icy. The planet also sports a series of about a dozen thin, dark, icy rings, possibly formed from a relatively recent breakup of one or more small moons.

Perhaps the strangest thing about Uranus is that its spin axis is tilted on its side by about 98 degrees relative to the ecliptic (the plane of Earth’s orbit around the Sun). The unusual axial tilt of Uranus may be a result of a grazing giant impact or a close encounter with Jupiter long ago. Whatever the case may be, it is yet another of our solar system’s many unsolved mysteries.



When waves of energy vibrate within your ears, you would possibly desire singing or dance. We tend to decision this music. It’s a special reasonably sound that we tend to fancy paying attention to as a result of it’s the ability to create us feel happy or unhappy. Music is formed by instruments that shake the air therefore the sound rushes toward us. Most instruments create a spread of sound frequencies, in order that they will play a musical tune.

Musical instruments create sound by moving the air back and forth all around them. The quicker they vibrate, the quicker they shake the air and also the higher the musical notes we tend to hear. Most instruments area unit designed in order that they will vibrate at slightly completely different speeds, creating many various notes. A stringed instrument has six strings, however you’ll press them in numerous places to create dozens of various notes.

Bottel organ
You’ll build associate organ by filling bottles with completely different amounts of water. Once you blow into a bottle, the air within vibrates, creating a musical notation. The fuller bottles create higher notes, whereas those with less water turn out lower notes.

We can produce associate infinite range of melodies by combining sounds from different instruments. Though every instrument makes sound waves, all of them work slightly otherwise. larger instruments tend to create lower and louder notes than little ones. Instruments with a lot of keys, strings, or holes will create a wider vary of notes. taking part in several instruments along in associate orchestra makes even a lot of fascinating effects.

It takes energy to provide sound, thus creating loud sounds for an extended time is difficult work. that is one reason why we’ve electrical instruments. They use electricity to assist us create loud sounds for long periods of your time.

Electric instruments additionally create terribly completely different sounds from ancient acoustic (nonelectric) instruments.


Ordinary acoustic guitars have strings that you just pluck. Once the strings move, they vibrate air within the wood case and this makes the sound. Electrical guitars have metal strings with pickups (wire-wrapped magnets) beneath. Once the strings vibrate, they create electrical currents flow through the pickups. If a stringed instrument is connected to associate electronic equipment and speaker system, these currents area unit boosted in volume to create loud music.