The 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 pulsars that emit X-rays and gamma radiation have also been observed.
Pulsars are essentially highly rotary and highly magnetized neutron stars, but when they were first discovered, they were thought to come from extraterrestrials.
& # 39; Wow! & # 39; Radio signal
In 1977 an astronomer who was looking for extraterrestrial life in the sky over Ohio saw a powerful radio signal so strong that he got excited and WOW! & # 39; Written next to his data.
In 1977 an astronomer in search of extraterrestrial life in the nearby sky over Ohio saw a powerful radio signal so strong that he was excited & # 39; Wow! & # 39; Written next to his data
The 72-second explosion, identified by Dr. Jerry Ehman via a radio telescope, came from Sagittarius but did not correspond to a celestial body.
Conspiracy theorists have stated that the & # 39; Wow! the signal, which was 30 times stronger than the background radiation, was a message from intelligent extraterrestrials.
Fossilized Martian microbes
In 1996, NASA and the White House made the explosive announcement that the rock contained traces of Marschantsen.
The meteorite, cataloged as Allen Hills (ALH) 84001, was deposited 13,000 years ago in the frozen areas of Antarctica's waste and restored in 1984.
The photographs were released with elongated segmented objects that looked surprisingly realistic.
The photographs were released with elongated segmented objects that looked surprisingly realistic (photos)
However, the excitement did not last long. Other scientists wondered if the meteorite samples were contaminated.
They also argued that the heat generated when the stone was exploded in space would create mineral structures that could be mistaken for microfossils.
Behavior of Tabby & # 39; s Star in 2005
The star, also known as KIC 8462852, is 1,400 light years away and has baffled astronomers since it was discovered in 2015.
It fades at a much faster pace than other stars, which some experts have suggested is a sign of extraterrestrials that use the energy of a star.
The star, also known as KIC 8462852, is 1,400 light years away and has baffled astronomers since it was discovered in 2015 (impression of the artist)
Recent studies have shown the possibility of an extraterrestrial megastructure & # 39; eliminated and suggest instead that a ring of dust could cause strange signals.
Exoplanets in the Goldilocks Zone in 2015
In February this year, astronomers announced they saw a galaxy with planets that could sustain life only 39 light years later.
Seven terrestrial planets were discovered in orbit around the nearby dwarf stars – Trappist-1, and they could all have water on their surface, one of the most important components of life.
Three of the planets have such good conditions that scientists say that life has already evolved on them.
The researchers say that within a decade they will know if there's life on one of the planets and they've said & # 39; this is only the beginning ".