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4. Complete the dialogue.

- How are artificial stars ...?

- As far as I know, a laser telescope is ....

- And ... about any successful ...?

- Yes, yesterday I found out...

- ... interesting. ... carried out?

- …

- I wonder why ...

-Well...

- Do you suppose ...?

- …

5. Match a line in a with a line in b.

А В

1. Would you like to know more a) An unusual application of

about artificial stars? a laser telescope.

2. What are the means of b) They believed radio waves were

scientific exploration? the most energy-efficient way of

3.What does the article deal sending signals across the space.

with? c) A telescope and a microscope,

4.What did the reporter claim? for example.

5.The scientists hope they'll d) Of course, I would!

contact distant civilizations e) He maintained that an artificial

with the help of a laser. sodium star had been generated.

6.Why did scientists look for f) That sounds fascinating!

radio signals from aliens?

5. Read the article attentively and learn how scientists try to establish

Interstellar communication.

BBC News Online

A telescope designed to search for laser signals from alien intelligences is to start scanning the skies next year. The 1.8-metre (6 ft) Optical SETI (Search for Extra-Terrestrial Intelligence) Telescope is currently being built in Harvard.

For more than 40 years, scientists have looked for radio signals from aliens on the understanding that radio waves provide the most energy-efficient way to send a signal across interstellar distances. But despite using the world's largest radio telescopes with highly sensitive detectors, no sign of a signal has been found in space as yet.

Several years ago some astronomers said it was hardly surprising that no radio signal had been

detected yet. They maintained that researchers might be looking for the wrong kind of message. It was assumed that a technologically advanced race might be more likely to communicate using pulsed laser beams rather than radio. The new approach was hoped to be more fruitful.

Searching for laser pulse signals was first suggested by the Nobel

prize winning scientist Charles

Townes in 1961 and was, according to

its supporters, met with 'more

interest than enthusiasm'. It was

thought that a high-powered laser

coupled with a large telescope could

send a signal across many light

years of space. Scientists believed

that an alien laser beam would be

pulsed to encode a signal.

During the pulse, lasting perhaps

less than a millionth of a second, the

laser light could be much brighter

than the light from the star in the

system from which the signal is being

sent. The new SETI Telescope will look for these brief pulses of laser light, scanning the entire northern sky once every 200 clear nights. It will have a special camera fitted with an array of 1,024 ultra-fast detectors that can spot flashes as short as a billionth of a second.

According to the researchers, using only the Earth 2001 technology we can now generate a beamed laser pulse that appears 5,000 times brighter than our Sun, as seen by a distant civilization. In other words, interstellar laser communication is altogether practicable with the new Optical SETI Telescope searching the sky for such signs of intelligent life elsewhere in the galaxy.

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