Over the last few decades, more than 4,000 exoplanets have been found. Some look like our Earth, most are quite different. When it comes to these worlds, a simple but obvious question comes to mind: “If we can see them, can they see us too?” Two researchers have given an interesting answer to this question.
The researchersEarth’s 100 parsecs (326 light-years identified near) that could contain Earth-like planets that could be detected using the method of crossing Earth 1,004 stars. The transition method is our most successful technique to date for discovering exoplanets. In our opinion, an orbiting planet creates a drop in starlight observed with a telescope as it passes in front of a star. This drop also allows us to gather information about the planet’s atmosphere by observing how it absorbs different types of light and gives us clues as to what elements are present in the planet’s atmosphere.
In order to detect a planet in this way, its orbit must be more or less in line with the line of sight between us and the star. Now, the researchers have discussed an opposite scenario, looking at potential candidates who could detect Earth in this way. the Monthly Notices of the Royal Astronomical SocietyAccording to research published in, therethat can clearly identify our planet and its atmosphere are many star systems.
director of Cornell’s Carl Sagan Institute, Professor Lisa Kaltenegger, andLehigh University Professor Joshua Pepper, focused on stars similar to our Sun. They found more than 1,000 stars, 508 of which could make an Earth transition observation for at least 10 hours.
He said Professor Kaltenegg makes, “Ifastronomers in this system and dials if they could see our world and atmosphere were able to determine that a biosp here marks,” he says and adds:“These stars are the brightest of some of our night skies without binoculars or a telescope can even see with the naked eye.”
This study offers some interesting targets for the TESS and SETI program, two telescopes NASA uses for exoplanet hunting. Will we find Earth-like planets in the habitable zone around these stars? Could they be looking after us anyway? “KalteneggerIf we find a planet with a living biosphere, we wonder if anyone is looking at us there. If we are looking for intelligent life in the universe that can find us and want to make contact, we have created a star map where we mark the places we need to look,” says.
