ARE WE ALONE IN THE

UNIVERSE?

        The discovery includes three ‘super-Earth’ orbiting a single Sun- like star. The planets are less 30 times the mass of Earth. All orbit very close to their stars. Hence, they are consider too hot to support any kinds of larger life.

         It was only in 2005 that the first  earth – sized exoplanet was discovered. However, it was only in April 2007 that the first earth – sized exoplanet was discovered in the so – called habitable zone. (The habitable zone in the distance from a star that provides temperatures at which liquid water is stable). More than 245 exoplanets have since been discovered.

       The search for exoplanets is one of the most exciting fields in astronomy. The discovery demonstrates that planets keep popping up in unexpected places around the universe. It will answer the question one day of whether we are alone in the universe.

ICT

The telephone, colloquially referred to as a phone, is a telecommunicationsdevice that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other. Developed in the mid-1870s by Alexander Graham Bell and others, the telephone has long been considered indispensable to businesses, households and governments, is now one of the most common appliances in the developed world. The word "telephone" has been adapted to many languages and is now recognized around the world.

All modern telephones have a microphone to speak into, an earphone (or 'speaker') which reproduces the voice of the other person, a ringer which makes a sound to alert the owner when a call is coming in, and a keypad (or on older phones a telephone dial) to enter the telephone number of the telephone to be called. The microphone and earphone are usually built into ahandset which is held up to the face to talk. The keypad may be part of the handset or of a base unit to which the handset would be connected. A landlinetelephone is connected by a pair of wires to the telephone network, while amobile phone (also called a cell phone) is portable and communicates with the telephone network by radio. A cordless telephone has a portable handset which communicates by radio transmission with the handset owners base station which is connected by wire to the telephone network, and can only be used within about 50 feet from the base station.

The microphone converts the sound waves to electrical signals and then these are sent through the telephone network to the other phone and there converted by an earphone, or speaker, back into sound waves. Telephones are a duplex communications medium, meaning they allow the people on both ends to talk simultaneously. The telephone network, consisting of a worldwide net of telephone lines, fiberoptic cables, microwave transmission, cellular networks, communications satellites, and undersea telephone cablesconnected by switching centers, allows any telephone in the world to communicate with any other. Each telephone line has an identifying number called its telephone number. To initiate a telephone call the user enters the other telephone's number into a numeric keypad on the phone. Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡ (U+2121), ☎ (U+260E), ☏ (U+260F), and ✆ (U+2706).

Although originally designed for simple voice communications, most modern telephones have many additional capabilities. They may be able to record spoken messages, send and receive text messages, take and display photographs or video, play music, and surf the Internet. A current trend is phones that integrate all mobile communication and computing needs; these are called smartphones.

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