Thames & Kosmos Do-it-Yourself UFOs handleiding

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Thames & Kosmos

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Handleiding

The search for extraterrestrial life

Are we alone?

This is a question that has been

on scientists’, explorers’ and

many other people’s minds for

centuries. SETI, or the Search for

Extraterrestrial Intelligence, is

the name for all sorts of ideas

and activities that involve the

search for intelligent life on

other planets.

The ﬁrst question we should

consider is: Are there planets

that may be able to support life

in the universe? You may ﬁnd

the answer a bit surprising. In

just our galaxy alone, the Milky

Way Galaxy, there are anywhere

from 200 to 400 billion stars and

50 billion planets. In recent

studies, it has been estimated

that 500 million of these planets

may be able to support life or

have environments

similar to Earth.

One of the most

common ways

scientists look for

possible life in space

is by listening for and

looking at electro-

magnetic radiation.

Electromagnetic

radiation exists all

around us, all the time. Anytime

you watch TV, listen to the radio,

or use your microwave, there are

electromagnetic waves present.

We can tell the difference

between types of electro-

magnetic radiation by

comparing the distances

between their wavelengths.

Scientists at the Search for

Extraterrestrial Intelligence

Institute use large radio

telescopes to listen and see if

there is intelligent life

somewhere in the universe that

is trying to communicate using

a type of technology that emits

electromagnetic radiation.

What would you do if we

received a signal? Do you think

we should respond?

A radio telescope

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