Practice English Speaking&Listening with: Ein Planet aus einer fremden Galaxie | Unser Universum

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Cannibalism is proscribed ... on Earth!

In outer space, an act of cosmic cannibalism

has brought an exoplanet

a planet from another galaxywithin astronomers reach

and into our galaxy, the Milky Way.

A European team of astronomers has detected

a Jupiter-like planet, orbiting a dying star.

The star, nearing the end of its life, may engulf the planet.

This could give us breath-taking clues about the fate and the future

of our solar system in the distant future.

Until now, astronomers have detected about

500 planets orbiting stars in our galaxy,

but none from outside the Milky Way.

Now a planet and its star,

both of extragalactic origin,

have been found and confirmed inside our galaxy.

The star, known as HIP 13044, is about 2000 light-years away from earth.

It is part of the Helmi stream

a stream of stars originally belonging to a dwarf galaxy

which was devoured in an act of cosmic cannibalism

by the Milky Way billions of years ago.

The new planet was detected by astronomers

who were looking for wobbles of the star,

caused by the gravitational tug of the orbiting planet.

These observations were made with a

high-resolution spectrograph named FEROS

at ESOs La Silla Observatory in Chile.

The planet named HIP 13044 b is one of only a few exoplanets

which survived the huge expansion of its sun.

When all the hydrogen in the core of a star was exhausted, the star became a Red Giant,

one step in its stellar evolution. HIP 13044 b is very close to its sun now.

At the closest point in its orbit its distance to the star

is only as long as 5.5 percent of the distance between earth and sun.

One circumnavigation takes only 16 days.

Astronomers think that the planets orbit has been much larger in the past.

They think it moved inwards during the Red Giant phase of the star.

Other planets located closer to the dying star

may not have been so lucky.

They might have been swallowed by the Red Giant,

and this evolution is not complete yet. Another expansion will happen,

and now that the planet is so close to the star, it may be doomed in the end, too.

Astronomers are searching for more planets orbiting dying stars,

because one day our sun will become a Red Giant too,

to our planetary system when this occurs.

and we want to know what might happen

We still got time to learn ... about four to five billion years! �

The Description of Ein Planet aus einer fremden Galaxie | Unser Universum