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The human immune system may find it difficult to ward off "foreign" bacteria and viruses from other planets


Discovery of pulsars

British astronomer Dame Jocelyn Bell Burnell was the first person to discover a pulsar in 1967 when she discovered a radio pulsar.

Since then, other types of pulsars have been discovered that emit X-rays and gamma rays.

Pulsars are essentially rotating, greatly enlarged neutron stars, but when they were first discovered they were believed to be from extraterrestrials.

& # 39; Impressive! & # 39; Radio signal

In 1977, an astronomer looking for extraterrestrial life in the nearby Ohio sky discovered a strong radio signal so strong that he excitedly wrote "Wow!" next to his data.

In 1977, an astronomer looking for extraterrestrial life in the nearby Ohio sky discovered a strong radio signal so strong that he excitedly wrote "Wow!" next to his data

The 72-second explosion that Dr. Jerry Ehman discovered through a radio telescope came from Sagittarius, but did not correspond to any known sky object.

Conspiracy theorists have since claimed that the & # 39; Wow! The signal ’, which was 30 times stronger than the background radiation, was a message from intelligent aliens.

Petrified Martian microbes

In 1996, NASA and the White House made the explosive announcement that the stone contained traces of Mars bugs.

The meteorite, cataloged as Allen Hills (ALH) 84001, plunged onto frozen Antarctic waste 13,000 years ago and was recovered in 1984.

Photographs were published showing elongated segmented objects that looked strikingly lifelike.

Photographs have been published showing elongated segmented objects that appear strikingly lifelike (image)

Photographs have been published showing elongated segmented objects that appear strikingly lifelike (image)

However, the excitement did not last long. Other scientists asked if 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.

Behavior of Tabby’s Star in 2005

The star, also known as KIC 8462852, is 1,400 light-years away and has amazed astronomers since its discovery in 2015.

It darkens much faster than other stars, which some experts see as a sign that aliens are using the energy of a star.

The star, also known as KIC 8462852, is 1,400 light-years away and has amazed astronomers since its discovery in 2015 (artistic impression)

The star, also known as KIC 8462852, is 1,400 light-years away and has amazed astronomers since its discovery in 2015 (artistic impression)

Recent studies have "ruled out the possibility of an extraterrestrial mega structure" and instead suggest that a dust ring could cause the strange signals.

Exoplanets in the Goldilocks Zone in 2015

In February this year, astronomers announced that they had discovered a planetary star system that could support life only 39 light years away.

Seven Earth-like planets have been discovered that cover the nearby dwarf star & # 39; Trappist-1 & # 39; orbit and everyone could have water on their surface, one of the key components of life.

Three of the planets are in such good conditions that scientists say that life has already developed on them.

The researchers claim that within a decade they will know whether or not there is life on one of the planets, saying, "This is just the beginning."

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