The most unexplained signals received on Earth that could be aliens

"Many of these radio waves and other forms of electro-magnetic radiation can be attributed to natural phenomena such as pulsars, colliding stars and the sun. But some, to this day, remain unexplained - and experts say they could be extraterrestrial in origin. The most renowned is the famous 'WOW' signal that was first detected in 1977. At the time, astronomers discovered a mysterious signal beaming from space that was so powerful it prompted astronomer Jerry Ehman to write 'Wow!' on the telescope's readout."

"Earlier this year, experts detected a cosmic entity called ASKAP J1832-0911 emitting joint pulses of radio waves and X-rays for two minutes every 44 minutes some 14,700 light-years from Earth. This was the first time an object like this, called a long-period transient, had been detected emitting X-rays. Currently, there is no clear explanation for what causes these signals, or why they 'switch on' and 'switch off' at such long, regular and unusual intervals."

Earth-based observatories constantly detect signals from deep space, mostly from natural sources like pulsars, colliding stars and the sun. Some signals remain unexplained and could be extraterrestrial. The 1977 'WOW' signal was an unusually strong radio burst that prompted astronomer Jerry Ehman to write 'Wow!' on a readout. Reanalysis found the signal over four times stronger than earlier estimates, and while a natural astrophysical origin is considered likely, alien origins cannot be ruled out. Earlier this year astronomers detected ASKAP J1832-0911, a long-period transient emitting radio and X-ray pulses for two minutes every 44 minutes, with no clear explanation yet.

Read at Mail Online