British astronomer Dame Jocelyn Bell Burnell was the first person to discover a pulsar in 1967 when she saw a radio pulsar.
Since then, other types of pulses that emit X-rays and gamma rays have also been seen.
Pulsars are essentially rotating, highly magnetized neutron stars, but when they were first discovered, they were thought to come from aliens.
“Wow!” radio signal
In 1977, an astronomer looking for alien life in the near sky over Ohio saw a strong radio signal so strong that he enthusiastically wrote ̵
In 1977, an astronomer looking for alien life in the near sky over Ohio saw a powerful radio signal so strong that he enthusiastically wrote ‘Wow!’ next to his data
The 72-second explosion seen by Dr. Jerry Ehman through a radio telescope, came from Sagittarius, but matched no known celestial body.
Conspiracy theorists have since claimed that ‘Wow! signal ‘, which was 30 times stronger than background radiation, was a message from intelligent extraterrestrials.
Fossilized martian microbes
In 1996, Nasa and the White House announced the explosive announcement that the cliff contained traces of Marsbugs.
The meteorite, cataloged as Allen Hills (ALH) 84001, crashed into the frozen debris of Antarctica 13,000 years ago and was recovered in 1984.
Photographs were released showing elongated segmented objects that appeared strikingly lifelike.
Photographs were released showing elongated segmented objects that appeared strikingly lifelike (pictured)
However, the excitement did not last long. Other researchers questioned whether the meteorite samples were contaminated.
They also claimed that heat generated when the rock was blown out into space may have created mineral structures that could be confused with microfossils.
Behavior of Tabby’s Star in 2005
The star, otherwise known as KIC 8462852, is 1,400 light-years away and has confused astronomers since it was discovered in 2015.
It attenuates much faster than other stars, as some experts have suggested, is a sign of aliens utilizing a star’s energy.
The star, otherwise known as KIC 8462852, is 1,400 light-years away and has confused astronomers since it was discovered in 2015 (artist’s impression)
Recent studies have ‘eliminated the possibility of an alien megastructure’ and instead suggest that a ring of dust may be causing the strange signals.
Exoplanets in the Goldilocks Zone in 2015
In February this year, astronomers announced that they had seen a star system with planets that could support life just 39 light-years away.
Seven Earth-like planets were discovered orbiting the nearby dwarf star ‘Trappist-1’, and all could have water on the surface, one of the key components of life.
Three of the planets have such good conditions that scientists say that life may have already evolved on them.
Scientists claim they want to know if there is life on any of the planets within a decade, saying ‘this is just the beginning.’