Jakarta –
For hundreds of years mankind has been looking outer space to look for evidence of existence alien. But when humans look for other life in space, there is a possibility that aliens are watching our life in space Earth.
In a new study published in the journal Nature Astronomy, astronomers identified 1,715 star systems that could have discovered Earth in the last 5,000 years.
Of these thousands of star systems, 46 star systems are positioned close enough that the planets around them can receive radio and television signals that were broadcast on Earth 100 years ago.
Researchers estimate that there are 29 planets that could potentially be inhabited by aliens that have the most forward position to observe and receive signals from Earth.
So far, astronomers find exoplanets by observing the ‘transit’ or process in which an exoplanet passes through its star so that the star appears to be flashing from Earth.
To discover these thousands of star systems, researchers from Cornell University and the American Museum of Natural History reversed the concept. They also established the Earth Transit Zone (ETZ) which imagines Earth as an exoplanet that passes through the sun and can be seen flashing by the sky alien in the distance.
Lisa Kaltenegger, a professor of astronomy at Cornell University, said the research team managed to find thousands of these star systems using data collected by the European Space Agency’s Gaia space probe.
From this they identified 2,034 star systems 326 light-years away that could possibly observe Earth’s transits in front of the sun over a time span from 5,000 years ago to 5,000 years in the future.
One of the stars found was Ross 128 in the constellation Virgo which is 11 light years away. This star is close enough to receive signals from Earth and has a planet that is twice the size of Earth.
If there is life on this planet with advanced technology, they may have been observing Earth transits for more than 2,000 years, but began to lose their best position about 900 years ago.
The two planets circling the Teegarden star system are also well positioned to monitor Earth’s transit over the next 29 years. This star system is 12.5 light years from Earth.
The Trappist-1 star system, 45 light-years away, is also close enough to receive signals from Earth. This star system has seven planets, four of which are in the habitable zone. But these planets will only reach a position to observe Earth’s transit within the next 1,642 years.
Keep in mind that this doesn’t mean scientists discovered life alien who has been watching the Earth for a long time. This report simply suggests that if there was life on those planets, and they had advanced technology like ours, there’s a good chance they would have found us first.
Meanwhile, humans are still continuing exploration projects to find other life in outer space. One of them is the James Webb Space Telescope project, which will launch later this year to see signs of life on exoplanets by analyzing their atmospheres.
Watch Videos”Cool! China’s Tianhe Space Station Now Equipped with WiFi“
[Gambas:Video 20detik]
(vmp / fyk)
– .
