Discovery of pulsars
British astronomer Dame Jocelyn Bell Burnell was the first person to discover a pulsar in 1967 when she spotted a radio pulsar.
Since then other types of pulsars that emit x-rays and gamma rays have also been spotted.
Pulsars
are essentially rotating, highly magnatised neutron stars but when they
were first discovered it was believed they could come from aliens.
'Wow!' radio signal
In
1977, an astronomer looking for alien life in the nigh sky above Ohio
spotted a powerful radio signal so strong that he excitedly wrote 'Wow!'
next to his data.
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In 1977, an astronomer looking for
alien life in the nigh sky above Ohio spotted a powerful radio signal so
strong that he excitedly wrote 'Wow!' next to his data
The
72-second blast, spotted by Dr Jerry Ehman through a radio telescope,
came from Sagittarius but matched no known celestial object.
Conspiracy
theorists have since claimed that the 'Wow! signal', which was 30 times
stronger than background radiation, was a message from intelligent
extraterrestrials.
Fossilised martian microbes
In 1996 Nasa and the White House made the explosive announcement that the rock contained traces of Martian bugs.
The
meteorite, catalogued as Allen Hills (ALH) 84001, crashed onto the
frozen wastes of Antarctica 13,000 years ago and was recovered in 1984.
Photographs were released showing elongated segmented objects that appeared strikingly lifelike.
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Photographs were released showing elongated segmented objects that appeared strikingly lifelike (pictured)
However, the excitement did not last long. Other scientists questioned whether the meteorite samples were contaminated.
They
also argued that heat generated when the rock was blasted into space
may have created mineral structures that could be mistaken for
microfossils.
Behaviour of Tabby's Star in 2005
The
star, otherwise known as KIC 8462852, is located 1,400 light years away
and has baffled astonomers since being discovered in 2015.
It
dims at a much faster rate than other stars, which some experts have
suggested is a sign of aliens harnessing the energy of a star.
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The star, otherwise known as KIC
8462852, is located 1,400 light years away and has baffled astonomers
since being discovered in 2015 (artist's impression)
Recent
studies have 'eliminated the possibility of an alien megastructure',
and instead, suggests that a ring of dust could be causing the strange
signals.
Exoplanets in the Goldilocks zone in 2015
In
February this year astronomers announced they had spotted a star system
with planets that could support life just 39 light years away.
Seven
Earth-like planets were discovered orbiting nearby dwarf star
'Trappist-1', and all of them could have water at their surface, one of
the key components of life.
Three of the planets have such good conditions, that scientists say life may have already evolved on them.
Researchers
claim that they will know whether or not there is life on any of the
planets within a decade, and said 'this is just the beginning.'
Comment by Oliviero Mannucci: I hope the phosphorus will also increase in the brains of scientist who do not believe the aliens have already arrived on earth.
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